The OT-301SL - Position Sensing Amplifier For Single Axis PSD
Features
- Analog Position Output Voltage
- Sum Output
- Wide Dynamic Range — Three Decades 103V/A, 104V/A, 105V/A
- DC to 15kHz
- Calibration Adjust
- Zero Offset Adjust
- Automatic Detector Bias
- Position Independent of Beam Intensity
OT-301SL General Description
The OT-301SL printed circuit board amplifier is designed for direct integration into OEM instrumentation. Optimized for single-axis Position Sensing Detectors (PSDs) with selectable bias voltages and three gain ranges, the OT-301SL's circuit elements add, subtract and divide signals with exceptional accuracy.
Precision op amps and resistor networks perform addition and subtraction operations; optimized analog dividers provide the final ratio. The analog divider ensures the utmost in linearity over a very wide signal range.
The final stages provide ±10% reading adjustment of the position output and serve as a high performance output buffer for driving long cables. The sum signal equals the total detector signal and is proportional to the incident beam power.
The OT-301SL includes a DC-DC converter that can be removed and replaced with an external power source for reducing cost in high-volume OEM applications.
Beam position is calculated from the ratios of signals generated by the PSD's two anode connections (designated Y1 and Y2). Dual transimpedance amplifiers on the
OT-301SL accurately measure the PSD's anode signal currents. The exact relationship between PSD signal and beam position is as follows:
where Y is the coordinate of the centroid of the beam spot on the PSD surface (measured from the detector center); and L is the size of the detector's sensitive
surface in mm (e.g.: 2.5, 5.0, 10, 20, 30 mm).
Specifications
Detector Type Single Axis Position Sensing Detectors
Anode Outputs (Common Cathode) Cathode Outputs (Common Anode) Bi-Cell (Common Anode or Cathode) Input Sensitivity 10-3 A/V, 10-4 A/V, 10-5 A/V Y Output Signal 0V to ± 10V Sum Output Signal 10V max Calibration Adjust ± 10% of reading Y Zero (offset) ± 1.0V Bias Voltage 0V, ± 5V, or ± 12V Linearity ± 0.1% Chnl to Chnl Tracking 1% Power AC Adapter ± 12V DC @ 500mA Size 3.5 x 5.0 inches Input Connector Receptacle DB9 Output/Power Connector Dual Row 10 PIN Header Amplifier Gain
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PSD INPUT CABLE
POSITION OUTPUT/
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