Portable Open-Path TDL Analyzer

Introducing the GasFinder3-OP

Understanding the Fundamentals

What you need to know

At a glance, here is what you need to know about the GasFinder3-OP which makes Line-of-Sight Gas Detection Measurements.

Target Gases

Detectable Gases with TDL

The table below shows both the gases and ranges that can be used with the GasFinder3-MC.

GasFinder3-OP Assembly

Configuration Options available

The GasFinder3-OP Assembly has the following configurable options:

  • Target Gas Selection: Select both the Target Gas and Range appropriate for the application.
  • Power Supply Options: Select between 12-24 VDC or 120-220 VAC Power Supplies.
  • Retro-Reflector Assembly:
    • Retro-Array: From Path Lengths from 5 – 500 m between the GasFinder3-OP and the Retro-Reflector.
    • Retro-Enclosure: Stainless Steel or Fiberglass Reinforced Plastic Enclosures surround the Retro-Array to provide mechanical protection.
    • Retro-Heater: For outdoor applications, it is recommended to select from the 24 VDC or 110-220 VAC Heater Options.

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  • Transceiver (Mono-Static) Configuration

    Transceiver Configuration

    GasFinder3-OP + Retro-Reflector

    Boreal Laser utilizes a Mono-Static Configuration (Transceiver and Retro-Reflector) for with its GasFinder3-OP. This differs from the Bi-Static Configuration (Transmitter and Receiver) Configuration in the following ways:

    • Ease of both Obtaining and Maintaining Optical Alignment: Without the use of tools and with one hand, the X-Y Mount enables for very fine adjustment of the GasFinder3-OP.
    • Longer Path Lengths: Higher powered Fiber-Coupled Lasers enable and the Transceiver Configuration allow for longer path lengths.
    • Tighter Beam Collimation and a Larger Target: More laser light is collected back at the GasFinder3-OP and this aids in providing a better analysis.
    • Better Tolerance to Vibration: With the Retro-Reflectors multiple Retro-Arrays focusing multiple beams of laser light back to the GasFinder3-OP, the vibration helps to average and quiet the returned signal.
  • GasFinder3-OP Components


    The Components and their Function

    The Open Path (OPX) Head includes the following components:

    • Alignment Scope + Visible Laser: The Alignment Scope and Visible laser are the tools used to aid in performing the alignment procedure.
    • GasFinder3-OP: This includes both the Optical Components and the Analysis Electronics in one integrated package.
    • Power + Communication Outputs: The GasFinder3-OP is powered by 12-24 VDC (20 Watts) or the optional 120-240 VAC Power Supply. The GasFinde3-OP has the following outputs: Analog Loop, Modbus (RS-485), and Serial (RS-232).
    • X-Y Aiming Mount: The X-Y Aiming Mount enables the end-user to easily obtain and optical alignment. The X-Y Aiming Mount can be affixed to tripod for easy portable use.
  • Retro-Reflector


    The Components and their Function

    The Retro-Reflector is comprised of the following components:

    • Retro-Enclosure + Rain/Dust Hood: The Enclosure provides mechanical protection to the Retro-Array clean and the Rain/Dust Hood keeps rain, snow, sleet, condensation, dirt, dust, and debris from accumulating on the Retro-Window.
    • Retro-Array: These are section through a cube and has three faces that form the inside of a cube and regardless of the angle of incidence of the incoming laser beam, the laser light is always reflected at 180° back to the Open Path (OPX) Head.
    • Retro-Heater:  Retro-Heaters are recommended if being installed in outdoor locations as it helps prevent water vapor from condensing on the Retro-Window.
    • Retro-Window: Like the Retro-Enclosure, this provides mechanical protection to the Retro-Array.


    Retro-Enclosure Options

    The Retro-Enclosure has the following configurable options:

    • Small Retro-Enclosure: These enclosure typically are used with Grey Tape (0.5-5m), IMOS (5-50m), 5 Cornercube (20-120m) Retro-Arrays.
    • Large Retro-Enclosure: These enclosure typically are used with 7 Cornercube (20-200m), 14 Cornercube (20-350m), 21 Cornercube (20-500m) Retro-Arrays.
    • 304 Stainless Steel (SST) Enclosure Material: This is the most popular and typical section for heavy industrial applications.
    • Fiberglass Reinforced Plastic (FRP) Enclosure Material: Most often used in light industrial applications.


    Retro-Heater Options

    The Retro-Heater has the following configurable options:

    • Recommended for Outdoor Installations: The Retro-Heater helps to keep condensation from building on the Retro-Window and causing a Beam Block Scenario.
    • Hazardous Area Heater & Thermostat: Both of these components are supplied with flying leads and are to be installed as per local electrical code.
    • 24 VDC Powered Retro-Heater (25W): Includes a 40°C (104°F) Thermostat.
    • 110-240 VAC Powered Retro-Heater (50W): Includes a 40°C (104°F) Thermostat.



    The Cornercube is comprised of the following components:

    • Cornercube Returns the Laser Light: Back towards the Open Path (OPX) Head for analysis. The way the Cornercube is configured, the Laser Beam will be focused on the Collecting Optics of the Open Path (OPX) Head with a size around 6″.
    • Laser Light is Always Reflected 180°: Due to the orientation of the three faceted mirrors. The Cornercubes have a tolerance of 30 arc-seconds.
    • Cornercubes for the Retro-Array:  To provide a larger target for the Laser Beam to hit. Each Cornercube will return its own individual Laser Beam and focus it on the Collecting Optics of the Open Path (OPX) Head.
    • It is Common to Oversize the Retro-Array: To provide even better alignment stability. The larger the Retro-Array, the more movement from the support structure can be tolerated.


    Calculating Laser Dot Size:

    Follow the following instruction to Calculate the Laser Dot Size:

    • Laser Light Emitted is Collimated: The Laser Dot will grow the further it travels from the Open Path (OPX) Head.
    • Collimated to 0.05 Degrees (0.9 Milliradian): Using milliradian allows for much easier calculations.
    • Formula for Calculating Laser Dot Size: 0.9 Milliradians (Beam Divergence) x Path Length (m) = Dot Size (mm)
    • Important for Procurement and Design: To ensure that alignment stability is maintained throughout Diurnal (Day/Night) and Seasonal Temperature swings are metal structures will expand and contract.



    The following table provides the minimum recommended array size for approximate path length ranges the aim to return optimal/enough laser light:

    • Grey Tape Retro-Array: 0.5 to 10 m (1.5 to 30 ft)
    • IMOS Retro-Array: 5 to 30 m (15 to 90 ft)
    • Wafer Retro-Array: 10 to 60 m (30 to 180 ft)
    • Five (5) Cornercube Retro-Array: 20 to 120 m (60 to 360 ft)
    • Seven (7) Cornercube Retro-Array: 20 to 200 m (60 to 600 ft)
    • Fourteen (14) Cornercube Retro-Array: 20 to 350 m (60 to 1,000 ft)
    • Twenty One (21) Cornercube Retro-Array: 20 to 500 m (60 to 1,500 ft)


    Here are few more important notes about Retro-Reflectors:

    • To ensure sufficient alignment stability, the retro-arrays can be over-sized without worry of performance degradation.
    • The Laser Dot size (shown in green in the above chart) shows how the Class 1 Eye Safe Laser Beam (IEC-60825-1)  diverges with distance.
    • To calculate the size of the Laser Dot at a particular distance, the following formula can be used: 0.9 Milliradians x ____ m Path Length = _______ mm Dot Size.
  • Accessories

    Tilt-Pan Scanner

    Used with the GasFinder3-OP

    The Tilt-Pan Scanner is comprised of the following components:

    • Scan Multiple Retro-Reflectors: With the Tilt-Pan Scanner, one (1) GasFinder3-OP can be used to aim at eight (8) successive Retro-Reflectors to create eight (8) different Active Measurement Paths.
    • Auto Light Level (Rx) Optimization: Upon moving to the Retro-Reflector, it will optimize the amount of Laser Light (Rx) and on stationary paths, it can be programmed to do this routine on a user defined time period.
    • Controlled by GasViewMP Software:  The Tilt-Pan Scanner is controlled by the GasViewMP Software which is ran with the Remote Monitoring + Control Center.
    • Mounting Options: The Tilt-Pan Scanner can be mounted on either a Heavy Duty Tripod or it can permanently affixed to a mounting structure.

    Remote Monitoring + Control Center

    Manage Remote Monitoring Campaigns

    The Remote Monitoring + Control Center enables the following:

    • Control the Tilt-Pan Scanner: The Tilt-Pan Scanner is controlled by the GasViewMP Software which is ran with the Remote Monitoring + Control Center.
    • Interface with the GasFinder3-OP: Also with the GasViewMP Software, the GasFinder3-OP can be remotely interfaced with.
    • Enable Remote Communication:  Within the Remote Monitoring + Control Center, the End-User has a choice to interface with either a Cell Modem or Radio Modem.
    • Power Distribution: The End-User has the option of powering the all of the equipment with either 12-24VDC or 120-240 VAC. The Remote Monitoring + Control Center handles the power distribution to all of the other equipment.



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