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LI-COR LI-192 Instruction Manual

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Underwater
Quantum Sensors
Instruction Manual
LI-192 Underwater Quantum Sensor
LI-193 Spherical Quantum Sensor

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Summary of Contents for LI-COR LI-192

  • Page 1 Underwater Quantum Sensors Instruction Manual LI-192 Underwater Quantum Sensor LI-193 Spherical Quantum Sensor...
  • Page 3 Regional Offices LI-COR Biosciences GmbH Siemensstraße 25A 61352 Bad Homburg Germany Phone: +49 (0) 6172 17 17 771 envsales-gmbh@licor.com LI-COR Biosciences UK Ltd. St. John’s Innovation Centre Cowley Road Cambridge CB4 0WS United Kingdom Phone: +44 (0) 1223 422102 envsales-UK@licor.com LI-COR Distributor Network: www.licor.com/envdistributors...
  • Page 4 LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. LI-COR shall not be liable for errors contained herein or for incidental or consequential damages in con- nection with the furnishing, performance, or use of this material.

  • Page 5: Table Of Contents

    Relationship between the Calibration Constant and Calibration Multiplier Connecting to metering devices from other manufacturers Using the 2009S Lowering Frame Section 2. Factory calibration procedures Section 3. Using the quantum sensors LI-192 Underwater Quantum Sensor Immersion effect Cosine response Cosine correction properties Spectral response...
  • Page 6 Section 6. Bibliography Appendix A. Specifications Appendix B. Warranty...

  • Page 7: Section 1. General Information

    Figure 1-1. "SA" type sensors are terminated with only a BNC connector on the end of the coaxial cable. When a LI-COR Light Meter or data logger is not used, type SA sensors can be used with other millivolt recorders or data loggers by connecting a millivolt output con- version adapter.

  • Page 8: Sensor Recalibration

    When using the LI-1400 DataLogger, the calibration multiplier must be entered into the software as described in the Instruction Manual. When a LI-COR light meter or data logger is not used, your sensor can be used with other millivolt recorders or data loggers by connecting a millivolt adapter. The LI- 192SA and LI-193SA underwater sensors require the 2291 Millivolt Adapter, which has a resistance of 1210 Ohms.

  • Page 9: Connecting To Metering Devices From Other Manufacturers

    Connecting to metering devices from other manufacturers The use of the millivolt adapter with a recorder or data logger other than LI-COR instruments is often acceptable for radiation levels down to 10% of full sunlight.

  • Page 10: Using The 2009S Lowering Frame

    The 2009S Lowering Frame provides for the placement of two cosine sensors, one each for upwelling and downwelling radiation, or a single underwater spherical sensor (Figure 1-2 on the facing page). Each LI-COR underwater sensor has three 6- 32 tapped mounting holes on the underside of the sensor for connection to the mounting ring.
  • Page 11 The LI-COR underwater cable is not recommended as a support cable, although it can be used as a lowering cable providing it is properly attached and the attached weights do not exceed 5 kg.
  • Page 12 Section 1. General information Figure 1-3. Attach the cable to the lowering frame at several points. LI-192 and LI-193 Quantum Sensors...
  • Page 13 Section 1. General information Figure 1-4. Attach a small weight to the lowering frame when using a single sensor. For long-term immersion or use in heavily ionic water, it may be necessary to provide electrical insulation between the underwater sensor(s) and the lowering frame to prevent galvanic corrosion.
  • Page 14 Section 1. General information Figure 1-5. Use an insulating washer in heavily ionic water. LI-192 and LI-193 Quantum Sensors...

  • Page 15: Section 2. Factory Calibration Procedures

    = 6.022 × 10 photons. The uncertainty of the calibration is ± 5%. The lamp used in LI-COR's calibration is a high intensity standard of spectral irradiance (G.E. 1000 watt type DXW quartz halogen) supplied with a spectral irradiance table.
  • Page 16 Section 2. Factory calibration procedures LI-192 and LI-193 Quantum Sensors...

  • Page 17: Section 3. Using The Quantum Sensors

    LI-190 Quantum Sensor. Prior to obtaining atmospheric read- ings, the sensor must be dried. New sensor cables from LI-COR are pre-lubricated with a thin film of silicone grease at the factory. The sensor connector may need to be lubricated periodically with a sil- icone grease (e.g.

  • Page 18: Immersion Effect

    Thus, a greater percentage of radiation entering the diffuser in air reaches the photodiode than in the case where the LI-192 is in water. Therefore, a normal underwater reading would need to be multiplied by this effect if the sensor is used in water.

  • Page 19: Cosine Correction Properties

    Cosine correction properties A comparison of the underwater sensor's cosine response curve in air and in water can be found in the "Immersion Effect and Cosine Collecting Properties of LI-COR Underwater Sensors" Report (Application Note #110, available from LI-COR). Engin- eering requirements result in different correction characteristics for air and water.

  • Page 20: Spectral Response

    λ, is much less than the wavelength setting λ. The normalized sensor spectral response r(λ), is determined by r(λ) = R(λ)/Rm where Rm is the maximum value of Q(λ)/W(λ) over the range of wavelengths meas- ured. LI-192 and LI-193 Quantum Sensors...

  • Page 21: Li-193 Spherical Quantum Sensor

    700 nm that are incident per unit time on the surface of a sphere divided by the cross-sectional area of the sphere, the LI-193 Spherical Quantum Sensor (and all other LI-COR quantum sensors) is designed to respond equally to photons between 400 and 700 nm.

  • Page 22: Angular Response

    For an explanation of the immersion effect as well as methods that can be used to determine it, a report entitled "Immersion Effect and Cosine Collecting Properties of LI-COR Underwater Sensors" is available from LI-COR (Application Note #110). Angular response The LI-193 sensor uses an acrylic diffuser to obtain an angular response error of less than ±...

  • Page 23: Errors

    Section 3. Using the quantum sensors Errors The spatial error of the LI-193 Sensor is due to variations in the diffusing sphere, (negligible), and the sphere area "lost" because of the sensor base. This error is less than -10% for totally diffuse radiation, but is usually smaller than this because the upwelling radiation is smaller than the downwelling radiation.
  • Page 24 In a uniform collimated beam of radiation, the following conditions of photon flux radiance hold 3-10 3-11 where Θ * is small such that sinΘ ≅Θ and cosΘ ≅1. LI-192 and LI-193 Quantum Sensors...
  • Page 25 Section 3. Using the quantum sensors Then 3-12 Also, 3-13 Therefore, PFFR ≅PFD. Photon flux fluence rate = photon flux density in a uniform collimated beam if the beam is normal to the cosine collector. One might also note that if the beam is per- fectly collimated (Θ* = 0), then the radiance L must be infinite in order for flux to be transmitted.
  • Page 26 Section 3. Using the quantum sensors 3-10 LI-192 and LI-193 Quantum Sensors...

  • Page 27: Section 4. Cleaning And Maintenance

    Keep the sensors clean and treat them as a scientific instrument in order to maintain the accuracy of the calibration. The vertical edge of the LI-192 diffuser must be kept clean in order to maintain appropriate cosine correction.
  • Page 28 Section 4. Cleaning and maintenance LI-192 and LI-193 Quantum Sensors...

  • Page 29: Section 5. Accessories

    100L Lubricant A lubricant that is used to displace water from connectors. A silicone lubricant (Dow Corning 111) is also available from LI-COR (p/n 210-01958-1) that provides lubrication between the sensor and the underwater cable. LI-192 and LI-193 Quantum Sensors...

  • Page 30: Millivolt Adapters

    Section 5. Accessories Millivolt Adapters Used for connecting sensors to other manufacturer’s datalogger or strip-chart recorder. 2291 Millivolt Adapter For the LI-192SA Underwater Quantum Sensor or LI-193SA Spherical Quantum Sensor (1210 Ohm resistance). LI-192 and LI-193 Quantum Sensors...
  • Page 31 Tyler, J.E., and R.W. Preisendorfer. 1962. Light in the sea, p. 399-400. In M.N. Hill (ed.), The Sea, V.I. Interscience. Other reports LI-COR has a number of publications that contain more detail about radiation meas- urement, including factory calibration procedures, terminology, measurement errors, units conversions, and radiation theory. These publications are available on request from LI-COR;...
  • Page 32 Section 6. Bibliography LI-192 and LI-193 Quantum Sensors...
  • Page 33 Mounting: Three 6-32 holes are tapped into the base for use with the 2009S Lower- ing Frame or other mounting devices. Cable: Requires 2222UWB Underwater Cable. Figure A-1. Dimensional drawing of the LI-192 quantum sensor. LI-192 and LI-193 Quantum Sensors...
  • Page 34 Mounting: Three 6-32 mounting holes are tapped into the base for use with the 2009S Lowering Frame or other mounting devices. Cable: Requires 2222UWB Underwater Cable. Figure A-2. Dimensional drawing of the LI-193 spherical quantum sensor. LI-192 and LI-193 Quantum Sensors...
  • Page 35 Lincoln, Nebraska 68504 USA Phone: 402-467-3576 FAX: 402-467-2819 Toll-free: 1-800-447-3576 (U.S. & Canada) E-mail: envsales@licor.com Declaration of Conformity Manufacturer’s Name: LI-COR, Inc. Manufacturer’s Address: 4647 Superior Street Lincoln, Nebraska USA 68504 declares that the product Product Name: Underwater Quantum Sensor Model Number(s): LI-192...
  • Page 36 FCC Title 47 CFR, Part 15.109; Radiated Emissions, Class B EN61326-1:1997/A1:1998/A2:2001/A3:2003 EN55011:1998/A1:1999/A2:2002; Radiated Emissions, Class B Supplementary Information: The product herewith complies with the requirements of the EMC Directive 2004/108/EC (formerly 89/336/EEC). John Rada Director of Engineering Document #53-09459-A August 14, 2007 LI-192 and LI-193 Quantum Sensors...
  • Page 37 Inc.'s examination discloses to have been defective in material or workmanship without charge and only under the following conditions, which are: The defects are called to the attention of LI-COR, Inc. in Lincoln, Nebraska, in writing within one year after the shipping date of the instrument.
  • Page 38 The foregoing constitutes LI-COR, Inc.'s sole obligation and liability with respect to damages resulting from the use or performance of the instrument and in no event shall LI-COR, Inc. or its representatives be liable for damages beyond the price paid for the instrument, or for direct, incidental or con- sequential damages.
  • Page 40 Regional Offices LI-COR Biosciences GmbH Siemensstraße 25A 61352 Bad Homburg Germany Phone: +49 (0) 6172 17 17 771 envsales-gmbh@licor.com LI-COR Biosciences UK Ltd. St. John’s Innovation Centre Cowley Road Cambridge CB4 0WS United Kingdom Phone: +44 (0) 1223 422102 envsales-UK@licor.com LI-COR Distributor Network: www.licor.com/envdistributors...

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