On-Trak - Postition Sensing Instruments

On-Trak - Postition Sensing Instruments

Dec. 23, 2002: The information on this page is no longer accurate. Please refer to www.on-trak.com for updated information or call them in Lake Forest, CA at 949-587-0769. - JW
On-Trak Photonics Inc.
22471 Aspan St.
Lake Forest, CA 92630
TEL: (714) 587-0769
FAX: (714) 587-9524

Postition Sensing Instruments

APPLICATIONS:

General Description:

The ON-TRAK series of Position Sensing Instruments are high performance, low cost, dedicated instruments for optical position sensing applications. These instruments provide precision position sensing required by applications such as laser beam alignment, beam centering, and bore-sight alignment ON-TRAK position sensing instruments facilitate easy measurement of angle, surface uniformity, flatness, parallelism, straightness and a host of other applications.

These Position Sensing Instruments are designed for one and two-dimensional absolute optical positioning or for precision centering and nulling requirements using a quadrant detector The optical beam is focused on the appropriate detector The photocurrent generated is processed by a four channel amplifier system using a position sensing algorithm to give an X, Y analog output which is directly proportional to beam position, independent of intensity fluctuations. With the appropriate optical configuration, this X-Y normalized output provides a solution for numerous applications.

OT-300 POSITION SENSING AMPLIFIER

Features:

The ON-TRAK OT-300 is designed to provide an X-Y position output and sum output from duolateral tetralateral single axis. quadrant and bi-cell position sensing detectors. The OT-300 has four transimpedance amplifiers and signal processing electronics to provide a normalized position and sum output. The OT-300 has five gain settings to accommodate input current ranges from 1nA to 2mA with a frequency response to 15KHz. A convenient ZERO adjust allows the user to electrically move the zero to a relative position on the PSD. A CAL adjust allows calibration to absolute position.

SPECIFICATIONS

OT-300 POSITION SENSING AMPLIFIER
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Transimpedance Gain (V/A)       10e+7 to 10e+3
Four Input Channels
Input Current Range             1nA to 2mA
Output Voltage
   Position X, Y                +/- 10V
   Sum                          0 - 10V
Zero Offset (Offset Null)       +/- 1V Each Axis
Calibration Adjust              +/- 10% Full Scale
Detector Bias                   0V, +/- 5V (Duolateral 0, 5, 10V)
Frequency Response              DC to 15KHz range dependent
Output Connectors               BNC
Input Connector                 Sub Min. D 9 PIN
Input Preamp Specification
   DC Drift                     0.2 microV/DegC. 0.3 pA/DegC
   Voltage Noise                0.5 microV p-p, 01-10Hz
   Bias Current                 30 pA
   Current Noise                3 pA p-p, 0.1-10Hz
Power Requirement               115V, 50/60Hz
                                230V, 50/60Hz
                                Switch Selectable
Dimensions (W,H,L)              5.57 x 2.52 x 8.50 in
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DETECTOR COMPATIBILITY

One-Dimensional PSD:
Common Anode
Common Cathode

Two-Dimensional PSD:

Duolateral
Tetralateral Common Anode
Tetralateral Common Cathode
Pin Cushion Tetralateral

Quad and Bi-Cell:

Common Anode
Common Cathode

OT-300L AMPLIFIER FOR DUOLATERAL PSD:

The OT300L is a printed circuit board amplifier designed for direct integration into users instrumentation. It is optimized for duolateral Position Sensing Detectors (PSD's) with adjustable bias voltages and three switch selectable gain ranges. The OT300L contains all the circuit elements to add subtract and divide detector signals very accurately. Precision op amps and precision resistor networks provide the addition and subtraction operations and optimized analog dividers provide the final ratio. This analog divider provides the highest linearity available over a very wide signal range. The final stages provide +/- 20% adjustment in the X and Y outputs and also serve as high performance output buffers for driving long cables. A sum signal is also provided which equals the total detector signal and is proportional to the incident beam wattage.

SPECIFICATIONS

OT-300L AMPLIFIER FOR DUOLATERAL PSD
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Detector Type           Duolateral PSD
Input Sensitivity       10e-4 A/V. 10e-5 A/V, 10e-6 A/V
X, Y Output Signals     0V to +/-10V
Sum Output Signal       5V max.
X Y Gain Trim           +/-20%
Bias Voltage            0 to +/-10V
Linearity               +/-1%
Channel to Channel      +/-1%
Tracking
Power                   +/-15V, 100 mA
Size                    3.5 in x 5.00 in
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ON TRAK PSD ASSEMBLIES

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MODEL NO.         DESCRIPTION
312.5             1L2.5SP 2.5 x 0.6 mm
315.0             1L5SP 5.0 x l.0 mm
3110              1L10SP 10.0 x 2.0 mm
3130              1L30SP 30.0 x 4.0 mm
322.0             2L2SP 2.0 x 2.0 mm
324.0             2L4SP 4.0 x 4.0 mm
3210              2L10SP 1O.O x 10.O mm
3220              2L20SP 20.0 x 20.0 mm
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Note: 1) See ON TRAK PSD Data Sheet for complete specifications on detectors
      2) Detector housing 2 in x 2 in x 1.75 in except for 2L20SP and 1L30.
      3) Includes 5 ft. 9-pin D sub cable male/male

PM KITS

The ON-TRAK PM-Processing Board, together with the PM-1D and PM-2D Preamplifiers. PM-Preamp Cable and PM-Serial Interface Board form a complete general purpose system for non-contact measurements using ON-TRAK 1L- and 2L-Series Position Sensing Detectors. The PM-kit, comprising the above mentioned boards, is ideally suited for evaluating the PSD technology in new application areas or for building prototypes of PSD based systems.

SPECIFICATIONS

PM Kit Boards
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CIRCUIT BOARD   FUNCTION
ID Analog       Preamplifier baord for 1L Series PSDs.
Preamp          Provides detector bias and converts signal
                current to voltage. Adjustable gain.

2D Analog       Two-channel preamp board for 2L Series PSD's.
Preamp      

PM Processing   Amplifies and rectifies signals from analog
Board           preamp board. yields sum and difference
                signals, performs analog division and fast
                11-bit A/D conversion. Optional analog
                output. (2L systems require two PM
                Processing Boards.)

PM Preamp       Connects 1D or 2D Preamp Board to PM
Cable           Processing Board.

PM LED Driver   Modulates LED signal source. provides
                synchronization signal to PM Processing
                Board if desired.

RS-232 C        Converts PM Processing Board output
Interface       signals from parallel digital to serial digital.
                Adjustable baud rates.
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Note: Please see ON-TRAK PM-KIT Data Sheets for detailed specifications.

CUSTOM SYSTEMS

ON-TRAK PHOTONICS can supply Custom Systems. Instruments and Components for your special PSD applications. Whether your specific requirement is analog design. digital design. opto-mechanical housings or systems requirements, ON-TRAK can provide your PSD solution.

Capabilities:

Joe Wagner