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| OT-301DL Position Sensing Amplifier
For: Duolateral Position Sensing Detectors
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The OT-301DL is a printed circuit board amplifier designed for direct integration into users instrumentation. It is optimized for duolateral Position Sensing Detectors (PSD) with adjustable bias voltages and three switch
selectable gain ranges. The OT-301DL 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 ratio. This analog divider provides the highest linearity available over a very wide signal range. The final stages provide ±10% 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. |
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 The duolateral PSD device has two cathode connections designated X1 and X2 and two anode connections (Y1 and Y2). The beam's position is calculated from the ratios of these signals. The OT-301DL has four current mode operational amplifiers designed to accurately measure the PSD anode and cathode signal currents. The four
amplifiers are designed to be closely matched and have very low noise levels.
The exact relationship between PSD signals and beam position is as follows: where X, 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, 4, 10 mm). |
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| Specifications: OT-301DL Amplifier for Duolateral PSD |
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| Detector Type |
Duolateral PSD |
| Input Sensitivity |
10(-3) A/V, 10(-4)A/V, 10(-5)A/V |
| X,Y, Output Signals |
0V to +/- 10V |
| Sum Output Signal |
6V max (5V bias) |
| Calibration Adjust |
+/- 10% of reading |
| X,Y, ZERO (offset) |
+/-1.0V |
| Linearity |
+/-0.1% |
| Bias Voltage |
0V to +/- 5V |
| Channel to Channel Tracking |
1% |
| Power |
+/-12 VDC @ 300mA |
| Size |
3.5 x 5.00" |
| Input Connector |
9 PIN D |
| Output/Power Connector |
Dual Row 10 PIN Header |
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*Bias voltages are factory set to +5V and -5V |
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| 12 Position DIP Switch |
Gain |
| ON= 1,4,7,10 |
10(-3) A/V |
| ON= 2,5,8,11 |
10(-4) A/V |
| ON= 3,6,9,12 |
10(-5) A/V |
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*10(-3) A/V, 10(-4) A/V, etc., equals 10 to the 3rd, 4th, etc.,power |
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Input Cable
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PIN#
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FUNCTION
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1
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X1 PSD Cathode
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2
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X2 PSD Cathode
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3
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Y1 PSD Anode
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4
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Y2 PSD Anode
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5
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GND
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6
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NC
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7
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NC
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8
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NC
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Output Cable
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PIN#
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PSD
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1
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X Position
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2
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GND
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3
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SUM
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4
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GND
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5
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Y Position
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6
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GND
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7
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+/-12V
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8
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GND
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9
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-12V
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10
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NC
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 Download PDF Version |
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