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ASD FieldSpec 3 User Manual

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FieldSpec® 3 User Manual
ASD.Document 600540 Rev. C
© 2005 by Analytical Spectral Devices, Inc.
www.asdi.com

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  • Page 1 FieldSpec® 3 User Manual ASD.Document 600540 Rev. C © 2005 by Analytical Spectral Devices, Inc. www.asdi.com...

  • Page 2: Trademark Information

    Trademark Information Analytical Spectral Devices, Inc. (ASD) 5335 Sterling Drive, Suite A Boulder, CO 80301 USA Phone: (303) 444-6522 www.asdi.com FieldSpec®, LabSpec®, QualitySpec®, SeaSpec®, RxSpec®, ViewSpec™, SpecSupport™, Indico™, AgriSpec™, RS ™, and TerraSpec® are registered trademarks, unregistered trademarks, and intellectual property of Analytical Spectral Devices, Inc., Boulder, Colorado, USA.

  • Page 3: Table Of Contents

    Table of Contents Trademark Information ......... . . ii Technical Support .
  • Page 4 ....... . . 71 ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 5 ........85 ASD.Document 600540 Rev. C...
  • Page 6 ............89 ASD.Document 600540 Rev. C...

  • Page 7: Declaration Of Conformity

    Declaration of Conformity ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 8 Notes: ASD.Document 600540 Rev. C viii FieldSpec® 3 User Manual...

  • Page 9: Chapter 1 Introduction

    Chapter 1 Introduction The FieldSpec® 3 Spectroradiometer is a general-purpose instrument useful in many application areas requiring the measurement of reflectance, transmittance, radiance, or irradiance. The FieldSpec spectroradiometer is specifically designed for field environmental remote sensing to acquire visible near-infrared (VNIR) and short-wave infrared (SWIR) spectra.

  • Page 10: Hardware Specifications

    AC Power Supply Type Auto ranging, Switching, SELV AC Input 90-240 VAC, 50/60 Hz DC Input +12 VDC, 50 W Acessory Power Port Output, +12 VDC, 19.2 W (max). (front of instrument) ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 11: Fieldspec® 3 Spectroradiometer Wavelength Configuration

    VNIR: 512 element silicon photo-diode array for 350-1000 nm. • SWIR1: “graded index” TE-cooled InGaAs photo-diodes for 1000 nm to 1830 nm. • SWIR2: “graded index” TE-cooled InGaAs photo-diodes for 1830 nm to 2500 nm. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 12: Interface Requirement

    The 802.11b wireless Ethernet cards within the FieldSpec spectroradiometer and instrument controller can allow communication distances of 30-40 m (100-150 ft). ASD tests the wireless communication up to 30 m (100 ft). However, obstructions or radio frequency interference in close proximity can cause loss of communication or significantly shorten the communication range.

  • Page 13: Computer Requirements

    Software Requirement The instrument controller requires the following software: • Software from ASD. • Microsoft Windows® 95/98/NT/2000/ME/XP Operating System. Users need a basic understanding of the Microsoft Windows operating system including software installation. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 14: Theory Of Operation

    Visible/Near-Infrared (VNIR) Note: This discussion assumes that the FieldSpec spectroradiometer has the hardware to perform a full-range spectrum analysis: VNIR, SWIR1, and SWIR2. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 15 The grating is physically oscillating with a period of 200 ms. It performs a forward scan (A) and a backward scan (B), resulting in 100 ms/scan. Thus, this is the minimum time required for any SWIR samples, or full-range samples. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 16 The DC shutter is an electro-mechanical device, so there is another level of DC created by the simple electronics that hold it closed. ASD measures this offset and stores it in the DCC (Dark Current Correction) entry in the ASD.Document 600540 Rev.
  • Page 17 With the reflectance of the reference standard available and known, RS compute the absolute reflectance or transmittance for the material being sampled. Accessories for Light Sources and Probes ASD offers several accessories for: • Delivering illumination to the sample. •...
  • Page 18 Chapter 1 Introduction Notes: ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 19: Chapter 2 Setup

    Chapter 2 Setup Inspect the shipping container and take careful notes regarding any damage to it and its contents that might have occurred during shipping. Note: Save all packing materials, foam spacers, and paperwork for possible future use. Figure 2-1 FieldSpec spectroradiometer carrying case and foam inserts.
  • Page 20 Ergonomic Pro-Pack on a flat surface with shoulder straps to floor and carrying the FieldSpec spectroradiometer and instrument controller. Step 2 Place the Ergonomic Pro-Pack on a flat surface with the shoulder straps towards the floor. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 21 Remove the instrument controller from its compartment on the outside of the Ergonomic Pro-Pack. Figure 2-5 Removing the FieldSpec spectroradiometer from the Ergonomic Pro-Pack. Step 4 Undo the five (5) plastic connectors which hold the FieldSpec spectroradiometer in the Ergonomic Pro-Pack. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 22: Power Supply

    An external adapter for vehicle cigarette lighters (sold separately and should not be used with vehicle engine running). Caution! Do not attempt to use non-ASD power supplies or connectors to power in the instrument. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 23 Both the external AC power supply and the DC battery pack have the appropriate power connector (Figure 2-9) to connect to the FieldSpec spectroradiometer on the back panel (Figure 2-10). ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 24: Ethernet Cables

    Figure 2-10 FieldSpec spectroradiometer back panel showing Ethernet connection, power switch, and power input jack. Ethernet Cables For Information about configuration of the Ethernet card and cable please refer to the Installation Guide. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 25: Accessory Power Port

    2-12. This port is where external accessories, such as the Contact Probe or Source Probe (mug light), attach to receive power from the spectrometer. Figure 2-12 Enhanced view of the front panel with the fiber cable connector and accessory power port. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 26: Pistol Grip

    Chapter 2 Setup The accessory power port is provided for optional ASD approved accessories. Attach the large connector end of the cable into the accessory power port of the front panel. Attach the other end of the power cable into the contact probe, mug light, or other ASD approved accessory.

  • Page 27: External Trigger

    The LEDs are light up when the trigger is pushed (briefly) and turn off when the capture is complete. Figure 2-14 shows the pistol grip with the trigger activated. Figure 2-15 External trigger and the FieldSpec spectroradiometer. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 28: Belly Board

    Adjust the shoulder straps of the Ergonomic Pro-Pack for comfort. Step 4 Detach the belly board from the neck strap and attach it to the shoulder straps of the Ergonomic Pro-Pack, as shown in Figure 2-17. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 29 Step 12 Repeat from Step 9 with the other velcro strip but place it a couple of inches or so away from the other strip. This is shown in Figure 2-18. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 30 Step 16 Repeat from Step 13 for the other velcro strip. The end result is shown in Figure 2-19. Figure 2-19 The belly board with instrument controller and neck strap. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 31: Chapter 3 Usage And Maintenance

    All operators should be familiar with this information. Light Sources Use only light sources supplied by Analytical Spectral Devices, Inc. Light sources supplied by ASD are designed to provide levels of illumination and stability of output that compliment the performance of ASD's instrumentation. 3.1.1 Operate Safely...

  • Page 32: Access And Ventilation

    Be sure all soap residue is removed and all surfaces are dry before use. Annual Maintenance ASD recommends that the instrument be recalibrated once a year. This will ensure that the wavelengths are accurate and that the instrument is still functioning properly.

  • Page 33: Rma

    Chapter 3 Usage and Maintenance In order to return the instrument to ASD for maintenance or repair, a Return Merchandise Authorization (RMA) must be issued by ASD Technical Support. The RMA includes scheduling details, contact information, shipping instructions, as well as a brief description of the maintenance or repair requirements.
  • Page 34 Chapter 3 Usage and Maintenance Notes: ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 35: Chapter 4 Fiber Optic Interface

    Chapter 4 Fiber Optic Interface ASD offers a variety of fiber optic cable lengths to interface with the FieldSpec® 3 Spectroradiometer. These fiber optic cables are used for reflectance, transmittance, radiance, or irradiance measurements. The fiber optic cable is routed straight through the front panel to the spectrometer.

  • Page 36: Led Check For Fiber Optic Cable

    Fiber Check Step 1 Remove any fore optic accessories from the spectrometer’s fiber optic cable. Step 2 Attach the magnifier to the end of the fiber optic cable, as shown in Figure 4-1. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 37 Chapter 4 Fiber Optic Interface Figure 4-1 Magnifier for testing the fiber optic cable. Step 3 On the instrument controller, exit any ASD applications that might be running and communicating with the unit. Such applications include RS and Indico. Step 4 Make sure that the spectrometer is turned on.
  • Page 38 The instrument can be successfully used with a few broken fibers in each range, although with a reduction in signal strength. For severely damaged fiber optic cables, send the instrument back to Analytical Spectral Devices, Inc. in its carrying case for repairs. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 39: Fore Optic Discussion

    Field of View ASD's line of spectroradiometers is available with a wide selection of foreoptics. These interchangeable foreoptics allow the flexibility to adapt the FieldSpec spectroradiometer to a wide range of applications.
  • Page 40 Y = D + 2 * X * Tan( A/2 ) Far Field (greater than 1 meter): Y = 2 * X * Tan( A/2 ) Table 4-1 Values of D in mm for ASD Foreoptics VNIR 1° 44.1 17.7 2°...
  • Page 41 Chapter 4 Fiber Optic Interface Irradiance Observations ASD has several types of foreoptics for irradiance measurements. These include: • ASD's in-air cosine corrected receptors for measurement of total irradiance • ASD's accessories for measurement of direct irradiance • ASD's under-water cosine corrected receptors for measurement of in-water up- and down-welling irradiance ASD.Document 600540 Rev.
  • Page 42 Chapter 4 Fiber Optic Interface Notes: ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 43: Chapter 5 Batteries

    Chapter 5 Batteries The battery specifications are: Type: NiMH (Nickel-Metal Hydride). Rating: 12 V 9 amp hour Life: Over four (4) hours using a full-range FieldSpec spectroradiometer with a Contact Probe in an ambient environment. Nine (9) hours using a VNIR-only FieldSpec spectroradiometer with accessory not powered by the instrument in an ambient environment.

  • Page 44: Battery Charger

    Whether discharged or not, the NiMH batteries should be charged at least every sixty (60) days. WARNING! Do not use batteries other than those supplied by ASD. Do not use ASD batteries in a manner unauthorized by ASD. Using improper batteries or improper use of ASD batteries could result in bodily injury or damage to the instrument.

  • Page 45: Rs Battery Indicator

    Battery Indicator application from ASD has a Power Status. It is located at the The RS bottom of the main window next to the Connection Status.The volt level of the spectrometer will be reported in the balloon type window.
  • Page 46 Chapter 5 Batteries Notes: ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 47: Chapter 6 Transporting And Carrying The Fieldspec® 3 Spectroradiometer

    Chapter 6 Transporting and Carrying the FieldSpec® 3 Spectroradiometer This chapter details how the shipping case, Ergonomic Pro-Pack, and FieldSpec spectroradiometer are designed to be used. This includes: • Packing FieldSpec® 3 Spectroradiometer for Shipment • Preparing the FieldSpec® 3 Spectroradiometer and Ergonomic Pro-Pack for the Field •...
  • Page 48 When facing the outside of the pack, we recommend putting the fiber optic cable on the left (as shown in Figure 6-1), because this puts the cable on top when placed into the shipping case. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 49 Two straps are on each side and one at the top. Figure 6-3 Ergonomic Pro-Pack with the instrument controller. Step 4 Place the instrument controller into its compartment of the Ergonomic Pro-Pack and zip up the zippers. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 50 Folding the pack belt (pouches) as given in Step 5 assists sliding the pack into the case, because there is only one orientation for placing the Ergonomic Pro-Pack into the shipping case. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 51 We recommend following these instructions which puts the fiber optic cable on top when placed in the case. Figure 6-7 Shipping case with Ergonomic Pro-Pack with FieldSpec spectroradiometer and instrument controller. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 52: Preparing The Fieldspec® 3 Spectroradiometer And Ergonomic Pro-Pack For The Field

    (e.g., cable side on left or right; mesh side close to the shoulder straps or away) Step 7 Use the five (5) straps to secure the spectroradiometer in the pack. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 53 The battery pouches on the hip belt have velcro loops for holding the cable, as is shown in Figure 6-11. Figure 6-9 Fiber optic spool on the outside of the Ergonomic Pro-Pack (with velcro). ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 54 Ergonomic Pro-Pack from where the fiber optic cable is. Refer to Figure 6-12. Step 10 Feed the battery cable up from the battery pouch under the cross strap to the power input of the FieldSpec spectroradiometer, as shown in Figure 6-12. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 55 Chapter 6 Transporting and Carrying the FieldSpec® 3 Figure 6-12 Routing the battery cable to the FieldSpec spectroradiometer. Figure 6-13 Fiber optic cable spool on the outside of the Ergonomic Pro-Pack. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 56 Ergonomic Pro-Pack, as shown in Figure 6-15. Figure 6-15 Belly board attaches to the shoulder straps of the Ergonomic Pro-Pack. Step 12 Place the instrument controller onto the velcro of the belly board. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 57: Carrying Supplies

    FieldSpec spectroradiometer. The straps on the outside of the pack are intended for tying on clothing or other large items. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 58: Protecting The Instrument In The Field

    Then pull the rain flap out of its compartment and over the outside of the pack. The shoulder straps are still free allowing you to hike towards shelter. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 59 Rain flap covering the unit. WARNING! Do not attempt to use the spectroradiometer with the rain flap deployed. The spectroradiometer may overheat, because the rain flap prevents adequate air from circulating to the instrument. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 60 Chapter 6 Transporting and Carrying the FieldSpec® 3 Notes: ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 61: Chapter 7 Field Measurements

    Chapter 7 Field Measurements Field spectrometry is the quantitative measurement of radiance, irradiance, reflectance or transmission in the field. It involves the collection of accurate spectra and requires an awareness of the influences of: • Sources of illumination. • Atmospheric characteristics and stability. •...

  • Page 62: Illumination

    (see Figure 7-1), each with its own spectral characteristics (Curtiss and Ustin, 1988). Unless the target is in a shadow, the direct solar illumination is the dominant source of illumination. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 63: Characteristics Of Artificial Illumination

    (Curtiss and Ustin, 1988). Characteristics of Artificial Illumination The use of artificial illumination allows: ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 64: Atmospheric Characteristics

    By far, water vapor is the strongest modifier of the incoming solar spectrum (Gao and Goetz, 1990). Water vapor has absorption features spanning the solar reflected region of the spectrum (see Figure 7-2), and varies both spatially and temporally. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 65 Figure 7-3 Transmission spectrum of carbon dioxide for typical atmospheric conditions. Other major atmospheric components that influence the atmospheric transmission spectrum are shown in Figure 7-4. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 66: Clouds

    Note: If the goal is to collect field spectra for image calibration or interpretation, spectra should be collected under illumination conditions similar to those at the time the image was collected. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 67: Wind

    The canopy level optical signal is dependant upon: • Illumination and viewing geometry. • Canopy structure. • Leaf optical properties. • The optical properties of other vegetative and non-vegetative components within and below the canopy. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 68 Other, minor, absorption features are attributable to other chemical components; these include: • cellulose • lignin • proteins • starches • sugars Non-photosynthetic components of the canopy have spectra which are dominated by absorption features attributed to lignin and cellulose. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 69 » leaf-angle-distribution: may change throughout the day as the leaves orient themselves toward or away from the incident radiation. Understory same as vegetation • Texture Soil • Color • Moisture content ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 70: Rocks, Soils, And Man-Made Materials

    The selection of a particular sampling strategy should be based upon the objectives of the study. If the objective is to determine the detectability of either a target material or of a process effecting the spectral signature of a ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 71: Viewing Geometry

    Set the sample, white reference, and dark current averages to 10 scans. For example, White Spectralon (Labsphere, Inc., Shaker St., PO Box 70, North Sutton, NH 03260-0070, PH: 603-927-4266, FX: 603-927-4694, E-mail: sales@labsphere.com, Website: www.labsphere.com). Spectralon is also available from ASD. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 72 Set the white reference and dark current averages to 60 for indoor illumination, or 150 for outdoor solar illumination. For example, ASD ProLamp is a DC stabilized light source for lab use and includes a power supply. Take white reference.

  • Page 73: White Reference

    FieldSpec® 3 Spectroradiometer using the white reference as the standard. Spectralon® from Labsphere is the white reference standard that is very suitable for the VNIR and SWIR spectral ranges of ASD instruments. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 74: Spectralon Reflectance Data

    0.990 0.991 0.992 0.992 0.991 0.991 1000 0.993 1100 0.993 1200 0.992 1300 0.992 1400 0.991 1500 0.991 1600 0.991 1700 0.988 1800 0.989 1900 0.981 2000 0.976 2100 0.953 2200 0.973 ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 75: Maintaining Spectralon References

    If the material requires high resistance to deep UV radiation, the piece should be prepared as above, then either of the following two treatments performed. Flush the Spectralon piece with >18 m½ distilled, deionized water for 24 hours. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 76: White Reference Procedures

    • Light changes. • Any atmospheric changes or changes in temperature. Note: Environmental conditions can change rapidly or slowly. It all depends on clouds, wind (affecting temperature), instrument warm up time, etc. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 77: Appendix A Troubleshooting

    For an established network, check that the Ethernet cable is a standard Ethernet cable. • Check that the IP Address is in the same range and subnet as the ASD spectrometer. © 2005 Analytical Spectral Devices, Inc. FieldSpec® 3 User Manual...
  • Page 78 » Run window with cmd. Figure A-1 Successful result of a ping operation. Figure A-2 The default IP Address for the ASD spectrometer is: 10.1.1.11 for the Ethernet interface, or • 10.1.1.77 for the wireless interface. • The default subnet mask is 255.255.255.0.

  • Page 79: Can't Get A Wireless Connection

    Refer to section A.1, Common Communication Fix. • Check to make sure the wireless adapter is in the same range as the ASD spectrometer. The default IP Address for the ASD spectrometer is: 10.1.1.11 for the Ethernet interface, or »...

  • Page 80: Does Not Connect To The Access Point

    If you are using encryption, then make sure you are using the same WEP • key in the spectrometer as the access point. • Move the access point, spectrometer, and instrument controller (computer) to the same room to test the connection. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 81: Spectrometer Loses Its Wireless Connection

    Common Communication Fix. • Check to make sure the wireless adapter is in the same range as the spectrometer. The default IP Address for the ASD spectrometer is: 10.1.1.11 for the Ethernet interface, or » 10.1.1.77 for the wireless interface. »...
  • Page 82 Appendix A Troubleshooting Notes: ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 83: Appendix B Reference Information

    Appendix B Reference Information Frequently Asked Questions (FAQ) B.1.1 How often do I need to optimize? Optimization has no affect on the data unless the measurement has drifted towards saturation, in which case optimization is mandatory. To be safe, optimize every 10 to 15 minutes. B.1.2 How often do I need a White Reference (WR)? Inside Use...

  • Page 84: What Spectrum Average Should I Use

    The field of view is labeled on the foreoptic that you use. When you are measuring radiance, it is important that the RS application software is using the correct field of view setting. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 85: What Are The Units Of Radiance

    Yes. ViewSpec is one of many applications that can post-process your data. ENVI is another imagine processing application. The spectral data can be important into many different applications. The complete specification of the ASD file format is available upon request. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 86: Why Do I See Oscillations (Sine Wave) In My Data

    Hold the end of the fiber cable further away from the sample to allow the FOV of the individual strands to overlap and mesh together. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 87: What Can Cause More Noise In My Data Than When I Previously Used The Instrument

    Although the material is very durable, care should be taken to prevent contaminants such as finger oils from contacting the material’s surface. Always wear clean gloves when handling Spectralon. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 88: B.1.17 How Do I Set Up Gps

    You need a National Marine Electronics Association (NMEA) compatible GPS device. RS requires the output of the GPS device to be in the NMEA format. Check your GPS device documentation for output and port settings. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 89: B.1.18 What Does A Broken Fiber Mean

    The fibers are protected by a metal spiral inside the black cable casing. If there are kinks in your cable, the fibers are not necessarily damaged. However, if your cable has been crunched so severely that you are able to see ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 90: B.1.19 How Long Is The Battery Life

    Programs running in the background can cause packets to be lost. Microsoft Office, image processing programs, and other software applications generally do not interfere with ASD programs, particularly if they are not running and competing for CPU cycles and RAM at the same time that data is being collected from the FieldSpec spectroradiometer.

  • Page 91: B.1.22 Why Does The Software Seem To Do Strange Things

    Appendix B Reference Information B.1.22 Why does the software seem to do strange things? To assure accuracy in the collection and processing of data, the ASD application software is designed to finish its current operation before moving on. The FieldSpec spectroradiometer spews out a lot of data at a high rate of speed for the ASD application software to collect.

  • Page 92: Gain And Offset

    (increases with ambient temperature). Light Source When using ASD's ProLamp illumination source, the less intense the lamp setting (knob on side of light source), the more diffuse (homogeneous) it will be. An average spot size of reasonable homogeneity is about 10 cm at a 50 cm lamp distance.

  • Page 93: Optimization

    Excessive discontinuities in radiometric spectra can be caused by not allowing the instrument to warm up fully. Normal discontinuities can be addressed by using the parabolic correction utility. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 94: Field Of View

    (the first zone located approximately between 1350-1400 nm and the other between 1810-1940 nm). If you look at a typical outdoor spectral irradiance file, you will see the energy in these bands drop to (or very nearly to) zero. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 95: Spectrum Averaging

    Technical Support If you have any questions or concerns, please contact Analytical Spectral Devices, Inc. by phone, fax, or email: Phone: 303-444-6522 Fax: 303-444-6825 email: support@asdi.com Web: www.asdi.com ftp: ftp.asdi.com ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...
  • Page 96 The Technical Support team is available to answer your questions Monday thru Friday, 8 am to 5 pm Mountain Standard Time. We will happily respond to your e-mail queries as well. ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

  • Page 97: Index

    Index Ergonomic Pro-Pack (A109900) A109900 Ethernet Ergonomic Pro-Pack ethernet cable absolutle reflectance Ethernet interface access point can’t connect accessories fiber check accessory fiber optics light sources and probes fiberoptic interface accessory power port field of view artificial illumination foreoptic ASCII conversion Frequently Asked Questions (FAQ) atmospheric characteristics atmospheric transmission...
  • Page 98 Spectralon cleaning spectrometer does not connect spectrum averaging spectrum average steps in data support SWIR technical support temperature effects trademarks tranporting trigger units of radiance vegetation ventilation visible/near-infrared VNIR ASD.Document 600540 Rev. C FieldSpec® 3 User Manual...

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