Download
Share
Print this page
  1. Manuals
  2. Brands
  3. Geometrics Manuals
  4. Measuring Instruments
  5. MetalMapper 2x2
  6. Operation manual

Geometrics MetalMapper 2x2 Operation Manual

Hide thumbs Also See for MetalMapper 2x2:

Advertisement

Quick Links

Download this manual
MetalMapper 2x2
Operations Manual
Version- DRAFT
PN 0071740-01

Advertisement

loading
Need help?

Need help?

Do you have a question about the MetalMapper 2x2 and is the answer not in the manual?

Questions and answers

Related Manuals for Geometrics MetalMapper 2x2

Summary of Contents for Geometrics MetalMapper 2x2

  • Page 1 MetalMapper 2x2 Operations Manual Version- DRAFT PN 0071740-01...

  • Page 2: Table Of Contents

    Table of Contents: Battery Safety 1. Introduction 2. System Overview 3. System Setup 4. Quick Start Guide 5. Sensor Function Testing 6. Static and Dynamic Modes 7. GPS and IMU Configuration 8. Data Format and Transfer 9. System Diagnostics and Troubleshooting Storage and Maintenance Appendix I: Schematics Appendix II: Measurement Theory...

  • Page 3: Battery Safety

    BATTERY SAFETY WARNING- Do not damage the rechargeable Lithium-iron phosphate batteries. A damaged battery can cause an explosion or fire, and can result in injury or property damage. -Do not use or charge the batteries if they appear to be damaged. Signs of damage may include punctures, leaks, or warping.

  • Page 4: Introduction

    1. Introduction This manual is a User’s Guide for the Geometrics MetalMapper 2x2 geophysical instrument used for the detection and characterization of Unexploded Ordnance (UXO). This instrument is based on the Naval Research Laboratory TEMTADS MP 2x2 Cart system developed over the past several years.

  • Page 5: System Overview

    2. System Overview The MetalMapper 2x2 is comprised of four transmitter coils approximately 35 cm x 35 cm in size. Located in the center of each transmitter coil is a 10 cm x 10cm x 10cm receiver cube, each one containing three (3) orthogonal coils to measure the fields resulting in 12 different receiver coils.
  • Page 6 Figure 2-2: Sensor platform with top cover removed. Sensor platform fully assembled. 2.1 Data Acquisition Electronics and Software The data acquisition electronics and batteries are mounted on a backpack worn by one of the operators. The electronics are connected to the cart by 3 cables: Tx Cable, Rx Cable, and GPS/IMU Cable. The second operator controls the system from a tablet computer running the ATEM software and connected to the electronics via an Ethernet cable.

  • Page 7: System Setup

    3. System Setup The MetalMapper 2x2 system is packed and shipped in a collapsible plastic crate (PN MM2x2 Crate) secured with banding. The crate dimensions are 48x44x36 with a packed weight of approx. 350 lbs. Foam inserts are cut to protect and secure the instrument during shipment. See Chapter 10 for more information on packing and unpacking the system from the shipping crate.
  • Page 8 Figure 3-2 Handle attachment 3.2 GPS/IMU Tower The GPS and IMU are installed on a 4-legged tower which is centered above the middle of the sensor platform. Assemble each leg of the tower as shown below: Figure 3-3 GPS tower legs The GPS sits on the mounting bolt which is standard 5/8”-11 threaded nylon rod.
  • Page 9 Figure 3-4 GPS Platform Installed. Note the tapered corners point in the direction of travel. The IMU is mounted in a weather-resistant housing. It sits on the shelf directly below the GPS and is centered above the sensor platform. The IMU is designed to only be installed with the correct orientation.
  • Page 10 Figure 3-5 IMU Installation. 3.3 Data Acquisition Electronics Backpack The electronics which control the data acquisition are housed in a weather-resistant orange Pelican case. The electronics housing box has 5 external connections- Rx cable, Tx cable, GPS/IMU cable, power, and Ethernet. The housing and cable connectors are designed to be water resistant. The electronics are cooled by the external heat sink fins.
  • Page 11 Figure 3-6 Backpack with Electronics and Batteries Mounted The electronics box is mounted to the backpack with top and bottom mounting brackets. The brackets are designed to hold the box so the handle is down and heat sink is out. These brackets can be left on for storage and shipment, but if the box needs to be removed see below:...
  • Page 12 3.4 Cable connections The MetalMapper 2x2 is typically supplied with 2 complete sets of different length cables. The shorter (9 foot) set is used with the system in walking mode, while the longer set (20 foot) is used with the instrument in skid-steer mode and as spares.
  • Page 13 Figure 3-8 Transmitter Tx and Receiver Rx Cable Connections The GPS/IMU cable connects to the serial port outputs on the GPS and IMU. It is recommended to zip tie these cables to the GPS towers to help with strain relief and prevent accidental disconnection during data collection.
  • Page 14 Figure 3-10 Side of electronics box showing Battery cable, Ethernet cable and GPS/IMU cable 3.5 Batteries The system is powered by 2 LiFe-Ion batteries (Lithium-Iron Phosphate). The batteries are connected in via a custom cable which allows for easy swapping and charging of the batteries. The standard battery pack uses a 22 A-h battery for the positive 12V and 10 A-h battery for the negative 12V.
  • Page 15 Figure 3-11 Battery pack and cable To charge the batteries please use the charger supplied. It will need 2 power outlets as each battery is charged separately. Total charging time is approx. 4 hours. See instructions on charger for indicator lights explanation.
  • Page 16 The MetalMapper 2x2 can also be deployed via a vehicle-mounted skid-steer. Geometrics supplies a skid-steer attachment made primarily of wood which is designed to hold both the MetalMapper 2x2 and original MetalMapper. To use the MetalMapper 2x2 with the skid-steer attachment, remove the wheels and axles from the sensor platform.

  • Page 17: Quick Start Guide

    Assemble the sensor cart, electronics box, and GPS/IMU as described in Chapter 3. The electronics box will start-up upon connecting the power. Connect the field tablet computer via the Ethernet and launch the MetalMapper 2x2 software. 4.1 System connection The software will connect to the electronics via Ethernet in about 20 seconds. During this time the software will display “Waiting”...
  • Page 18 Once the hardware and software are successfully communicating, the status window will display “Ready” in blue. The status window is always shown in the software. From left to right, it indicates date and time from the computer’s clock, event log, GPS fix quality indicator, and position and IMU information. GPS fix information is parsed out of the NMEA string.
  • Page 19 YPR indicates Yaw (magnetic heading), Pitch, and Roll from the IMU. The Yaw is corrected for magnetic declination set in the EquipmentConfiguration.xml file. 4.2 System Configuration When the software is successfully communicating with the electronics, navigate to the Project Settings tab in the Control window.
  • Page 20 4.3 Parameter Setup...
  • Page 21 This window selects the measurement type under “Survey Mode”. Dynamic and Static selections will have default Parameters that cannot be changed by the operator. Test180 is used for instrument troubleshooting and should not be selected during regular operation. Advanced Measurement allows the operator to select the Parameters.
  • Page 22 Background Drift Window: Time window in microseconds used to compare amplitudes (Z-component) for drift from reference background measurement. Ratio is the change in backgrounds allowed before the system displays a warning. Background acquisition reminder interval: Time in minutes which the software will remind the operator to make a background measurement.
  • Page 23 Once the targets have been acquired, they will turn green. A red target indicates a background measurement location. Once the cart is navigated to the correct position, hit the button marked “Acquire” to collect data. The data file will be named automatically based on the project file description and measurement type. See chapter 8 for more information on file naming.
  • Page 24 Static Measurement data can be viewed in the Acquired Data window. Replot will also plot old acquired measurements. All measured components of the data can be displayed in the plot. The naming convention is <TxCoil><Direction><RxCube>. Notes can be added in the “Notes” section. The Notes will be stored as metadata in the file that is being displayed in the plot window.
  • Page 25 Quality Control (static Static survey of emplaced IVS targets for QC purposes IVS) Dynamic QC (IVS line) Dynamic survey of an IVS used for QC purposes Function Test A direct test of all sensor component responses to a standard object placed at a precisely know location (relative to the sensor).

  • Page 26: Sensor Function Testing

    The master SFT is stored on the computer in the directory: /usr/MMData/InstrumentFunctionTest/ With the naming convention: <Geometrics>_<CartSerialNumber>_<SFT>_<ISOSerialNumber>_<YYYYDDD>_00.h5 Where <CartSerialNumber> is the Serial Number printed on the outside of the sensor platform and referenced in the EquipmentConfiguration.xml file and <ISOSerialNumber> is the serial number printed on the ISO unit.
  • Page 27 Load the master Reference SFT file in the QC Settings window. This is the file that future SFT measurements in the field are compared to. Select “Static Mode” in the Parameter Setup and open the Survey window. Perform a background measurement (SBG) in a known clean (free of metal) location. The SFT measurement requires a SBG measurement immediately prior.
  • Page 28 Select “Functional Test” as the measurement type. Acquire a measurement. The software will display a warning if the known reference file has not been loaded in the QC tab. After the Functional Test has been collected, the software will automatically compare the measured data to the data in the known reference file.
  • Page 29 Example of a SFT Pass. Note that all Delta Values are below 2.000. The criterion of the function test is defined as follows: Where f and r are the 'monostatic' (concentric) Z background corrected responses from the current and reference function tests, respectively. The threshold T is set so that variation due to noise is accepted but variation due to misplacement of the function test object or to electronic failure is flagged.
  • Page 30 The known reference DFT file is located in: /usr/MMData/InstrumentFunctionTest/ With the naming convention: <Geometrics>_<CartSerialNumber>_<DFT>_<ISOSerialNumber>_<YYYYDDD>_00.h5 Where <CartSerialNumber> is the Serial Number printed on the outside of the sensor platform and referenced in the EquipmentConfiguration.xml file and <ISOSerialNumber> is the serial number printed on the ISO unit.
  • Page 31 If the background should be allowed to vary by a factor of 5, then T is just 5*{number of time bins} Backgrounds both 5x higher and 5x lower will be flagged.
  • Page 32 Data can be collected in Static Mode over a list of known anomalies or targets. These targets can be determined from a previous geophysical survey or from the results of the MetalMapper 2x2 dynamic mode survey. A target list file is loaded into the software (see Chapter 4.6), which then directs the operator to collect Static Measurements over each target.
  • Page 33 Once the targets have been acquired, they will turn green. A red target indicates a background measurement location. Once the cart is navigated to the correct position, hit the button marked “Acquire” to collect data. The data file will be named automatically based on the project file description and measurement type. See chapter 8 for more information on file naming.
  • Page 34 Static Measurement data can be viewed in the Acquired Data window. Replot window will also plot old acquired static measurements by loading the desired .h5 file. The plot below shows a background measurement. Note that the amplitudes in “Z” are greater than in the X or Y directions.
  • Page 35 Below is an example plot of a background-corrected SFT (passed the test). It can be difficult for the field operator to interpret these graphs in the field due to the large volume of data displayed after every measurement. However it can be helpful to diagnose bad channels in the event of a failed SFT. All measured components of the data can be displayed in the plot.
  • Page 36 transmit and receive cycle runs. See Appendix 2 for more information about the theory of dynamic acquisition.
  • Page 37 7. GPS and IMU Installation 7.1 IMU Overview The IMU is designed to only be installed with the correction orientation on the cart. The 3 bolts attaching it to the platform make the sensor have Y in the direction of motion, X to the left, and Z up (see figure 2.1).
  • Page 38 Hemisphere S230 at 19200 Baud. The model name is only used for reference. The Baud rates much match or the MetalMapper 2x2 software will not read the GPS data. Save the edited EquipmentConfiguration.xml file.
  • Page 39 8. Data File Format 8.1 HDF5 files and export The MetalMapper 2x2 stores data in an HDF5 file. HDF5 is a self-describing hierarchical data format. Each group in the dataset can have associated attributes. Metadata is stored in the form of user- defined, named attributes attached to the groups or file.
  • Page 40 FILE METADATA EXAMPLE / (96) Group size = 2 Number of attributes = 59 AcquisitionMode = SBG AcquisitionSoftwareVersion = 0.9 AmbientCps = 60,Hz AmbientMode = 1 Annotation00 = 222140,[598317.646 E,4139833.664 N],meters 10N,38.9, field note test Annotation01 = 222141,[598317.793 E,4139833.666 N],meters 10N,38.9, field note test Annotation02 = 222142,[598317.793 E,4139833.666 N],meters 10N,38.9, field note test Annotation03 = 222143,[598317.793 E,4139833.666 N],meters 10N,38.9, field note test Averaged = 1...
  • Page 41 Holdoff = 48,microseconds LogarithmicallyDecimated = 1 MagneticDeclination = 13.5535,degrees MaximumBackgroundVariation = 10,% MeasurementNumber = 07 NanoTeslasPerSecondPerMillivolt = 382.0000000,nT/sec/milliVolt Operator = metalmapper OrientationSensor = CHROBOTICUM7(x=0.0000, y=0.0000, z=0.7809) OriginalBasePath = /usr/MMData Project = SAMPLE RawValues = 0 ReceiverCoilVertices = AX:(x=-0.2008, y=0.1548, z=0.0452)(x=-0.2008, y=0.2468, z=0.0452)(x=- 0.2008, y=0.2468, z=-0.0452)(x=-0.2008, y=0.1548, z=-0.0452),AY:(x=-0.2460, y=0.2008, z=0.0452)(x=- 0.1555, y=0.2008, z=0.0452)(x=-0.1555, y=0.2008, z=-0.0452)(x=-0.2460, y=0.2008, z=-0.0452),AZ:(x=- 0.2468, y=0.2468, z=0.0000)(x=-0.1548, y=0.2468, z=0.0000)(x=-0.1548, y=0.1548, z=0.0000)(x=-0.2468,...
  • Page 42 Stacks = 1 SurveyMode = STATIC SwathWidth = 1.00,meters Target = NONE TotalBlockTime = 399.936,seconds Tractor = (length=0.50, width=0.50, operatorEyeHeight=1.80, distanceBehindCart=1.25, operatorX=0.00, operatorY=0.00) TransmissionCurrentThreshold = 9.00,amperes TransmitterCoilVertices = TA:(x=-0.4012, y=0.4012, z=0.0000)(x=-0.0004, y=0.4012, z=0.0000)(x=- 0.0004, y=0.0004, z=0.0000)(x=-0.4012, y=0.0004, z=0.0000),TB:(x=0.0004, y=0.4012, z=0.0000)(x=0.4012, y=0.4012, z=0.0000)(x=0.4012, y=0.0004, z=0.0000)(x=0.0004, y=0.0004, z=0.0000),TC:(x=0.0004, y=-0.0004, z=0.0000)(x=0.4012, y=-0.0004, z=0.0000)(x=0.4012, y=-0.4012, z=0.0000)(x=0.0004, y=-0.4012, z=0.0000),TD:(x=-0.4012, y=-0.0004, z=0.0000)(x=-0.0004, y=-0.0004, z=0.0000)(x=-0.0004, y=-0.4012, z=0.0000)(x=-0.4012, y=-0.4012, z=0.0000)
  • Page 43 FILE METADATA DEFINITIONS Group size = 2 (transients and deviations), set by HDF5 standards Number of attributes = number of metadata attributes AcquisitionMode = see chart below for definitions AcquisitionSoftwareVersion = defined in software AmbientCps = Power line frequency AmbientMode = Power line frequency subtracted out of data, 1= true (normal operation) 0=false (for instrument debugging) Annotation00 = text field notes entered by operator during acquisition Annotation01 = text field notes entered by operator during acquisition...
  • Page 44 ReceiverCoilVertices = fixed geometries ReceiverExtents = fixed geometries ReceiverGains = software defined fixed values ReceiverNormalVectors = fixed geometries ReceiverTurns = fixed geometries Repeats = number of measurements averaged per sample SampleWidth = defined sample rate ScaleTomicroTeslasPerSecond = scaling factor Stacks = stacks per measurements SurveyMode = STATIC or DYNAMIC SwathWidth = fixed geometry Target = software defined...
  • Page 45 Function Test A direct test of all sensor component responses to a standard object placed at a precisely know location (relative to the sensor). Function Test A direct test of all sensor component responses to a standard object placed at a precisely know location (relative to the sensor).
  • Page 46 DEVIATIONS- Contains statistics information (standard deviations) of the stacked transient measurements Deviations (9440, 2) Group size = 4 Number of attributes = 0 DEVIATIONS METADATA 0000 (17944, 2) 32-bit floating-point, 99 x 13 Number of attributes = 2 TransientNumber = 0000...
  • Page 47 stored = 2015-10-16T22:21:42.726Z TRANSIENTS Transients (8288, 2) Group size = 4 Number of attributes = 1 TransientList = GateTime,ZA,ZB,ZC,ZD,YA,YB,YC,YD,XA,XB,XC,XD TRANSIENTS METADATA EXAMPLE 0000 (16576, 2) 32-bit floating-point, 99 x 13 Number of attributes = 13 Attitude = (yaw=324.184, pitch=-7.550, roll=4.790),degrees AveragedN = 3 Elevation = 38.900,meters GPSTime = 222140...
  • Page 48 32-bit floating-point, 99 x 13 Number of attributes = number of metadata attributes Attitude = cart orientation during acquisition AveragedN = number of stacks averaged Elevation = from GPS GPSTime = UTC Time HAE = height above ellipsoid (from GPS) NSat = number of satellites Quality = 4= RTK fix (for normal operation), 2=GPS fix without RTK TransientNumber = count from 0...

  • Page 49: System Diagnostics And Troubleshooting

    IMU data missing or 1. Unplug and plug in the IMU cable to cycle power. incorrect 2. Restart the MetalMapper 2x2 software to check connection. 3. Calibrate the IMU following the calibration instructions. Instrument fails SFT 1. Make sure the instrument is in a “clean” area free from metal debris or metal items.

  • Page 50: Storage And Maintenance

    10. Storage and Maintenance 10.1 Lithium Ion Battery Shipping Guidelines for Customers The battery case is designed to make shipping the batteries back to Geometrics as easy as possible. The following are some guidelines on how to ship them. The following must be included on the outside of the box to be shipped: •...
  • Page 51 10.2 Packing the Shipping Crate The entire instrument is designed to be stored and shipped in a collapsible plastic crate. The dimensions are 48”w x44”l x 36”h and weighs about 350lbs packed. The shipping crate requires banding materials to be secured shut. If banding materials aren’t available cargo straps also work. Bottom level of the crate.
  • Page 52 The GPS tower arms fit in the slotted foam piece that sits above the wheels. The cart handle fits atop the bottom level of the foam piece in the slots cut for it. Cables or other miscellaneous items can be stored next to the battery box or next to the backpack in its slot.
  • Page 53 Place the cart in the foam insert. Secure the straps around it to help lift the sensor platform out of the inserts. The IMU and GPS tower platform slides into the foam slots on the rear side of the sensor platform, opposite the cable connector housing.
  • Page 54 Place the small foam insert on top of the sensor platform. This insert helps secure the sensor platform from vibrating during transit. The axles fit diagonally into the small cut notches in the foam. Cables are coils and placed atop the sensor platform. The large rectangular foam insert covers the entire crate.
  • Page 55 Appendix I: Standard Inventory List:...
  • Page 56 Appendix II: Theory of Operation The figure above shows how the instrument performs background cancellation. The example is for 60 Hz, but of course the same diagram can be used to determine what to do for 50Hz or 180Hz, etc. The x scale is microseconds.
  • Page 57 be canceled). By inspection one can see that the background contribution during the negative decay will exactly cancel that during the positive decay, thus we see just the decay curve we're interested in and not the background. The data we report is simply the difference between that measured during the positive decay and the negative decay.