- Combines SP photodiode detector, programmable charge integrator, and data conversion in a compact package.
- Expandible with add-on modules for cooled sensor capability.
- Null function for background noise subtraction.
- Programmable gain ranges.
- Windows® based data acquisition software included.
- Easy to install and use on any SP Monochromator.
- Internal data averaging.
Compact, Convenient, Affordable
The AD131 is a computer controlled data acquisition device for photodiode detectors, covering a wide wavelength range with Si, InGaAs, PbS, and PbSe photocells from the AD4x series. The unit contains an internal programmable charge integration amplifier, a 16-bit A/D converter, and a microprocessor with a USB2.0 interface. Signal processing functions take place internal to the AD131 to greatly reduce the noise level of the measured signal, including Correlated Double Sampling (CDS) and signal oversampling for digital filtering. Windows® based software allows for stand-alone operation or integrated control and data acquisition with any of the Digikröm line of monochromators.
Adding the AD131-TC Thermoelectric Controller module to the AD131 enables the use of AD4x series heads with cooling capability (designated by a "-C" on the model name). AD4x heads are easily exchanged on the same AD131 unit.
| SP Part # |
Detector Type |
Size |
Range |
Temp |
Sensitivity |
Dark resistance or current |
| AD421 |
Si |
5.8x5.8 |
190-1000 |
25°C |
0.4 A/W at 720 nm |
20 pA |
| AD427* |
PbS |
3x3 |
1000-2900 |
25°C |
5x104 V/W at 2200 nm |
0.5 to 2.5 MΩ |
| AD429* |
PbSe |
3x3 |
1500-4800 |
25°C |
5x102 at 4 µm |
0.3 to 1.5 MΩ |
| AD430 |
InGaAs |
3 dia |
800-1700 |
25°C |
0.95 A/W at 1.55 µm |
15 nA |
| AD431 |
Si/InGaAs |
2.4x2.4 |
300-1700 |
25°C |
0.45 A/W at 0.94 µm |
30 pA |
| |
|
1 dia |
|
25°C |
0.55 A/W at 1.55 µm |
1 nA |
The following require the AD131-TC Thermoelectric Controller module in addition to the AD131 Photodetector module
| SP Part # |
Detector Type |
Size |
Range |
Temp |
Sensitivity |
Dark resistance or current |
| AD427-C* |
Cooled PbS |
4x5 |
1000-2900 |
-10°C |
8x104 V/W at 2.2µm |
0.5 tp 10 MΩ |
| AD429-C* |
Cooled PbSe |
3x3 |
1500-4800 |
-10°C |
1x103 V/W at 4 µm |
1.7 to 7 MΩ |
| AD430-C |
Cooled InGaAs |
3 dia |
800-1700 |
-10°C |
0.95 A/W at 1.55 µm |
1 nA |
| AD431-C |
Cooled Si/InGaAs |
2.4x2.4 |
300-1700 |
25°C |
0.45 (25°C) at 0.94 µm |
30 pA |
| |
|
1 dia |
|
-10°C |
0.55 at 1.55 µm |
0.07 nA |
*Requires 450 Hz chopped optical signal
| Feature |
Value |
| Wavelength Range: |
Depends on Sensor type |
| A/D Resolution: |
16 bit |
| A/D Conversion Rate: |
500kSPS |
| Response Rate: |
USB 2.0 |
| Time Constant: |
10µS, 100µS, 1mS, 10mS (selectable) |
| Low Pass Filter: |
1/3Hz, 1Hz, 10Hz, 100Hz (selectable) |
| Phase Shift: |
0-180 degrees (selectable) |
| Amplification Gain: |
x1 to x10 (selectable) |
| Phase Lock Loop Voltage Input: |
0-5V optical chopper reference signal |
| Trigger Input Voltage: |
0-5Vdc TTL |
| Supply Voltage: |
100-240 Vac |
| USB2.0 Transfer Rate: |
480 Mbits/S |
| Software: |
Windows® control program for stand-alone use or integrated with SP Monochromators. |
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