The SiTek Standard PSD (Position Sensing Detector) has high resolution, fast response and outstanding linearity. It is used in a wide variety of applications, most of them utilizing light sources in the visible or near-infrared part of the spectrum. The spectral range covers the region 400 – 1100 nm. Thanks to SiTek’s proprietary AR-coating, optimized around 860 nm, a reflection loss of only 2% is achieved around the responsivity peak. Most of the detectors have a cover window to avoid handling damages.
Position Sensing Detectors (PSD)
The PSD (Position Sensing Detector) is an opto-electronic device which converts an incident light spot into continuous position data. It provides outstanding resolution, fast response, excellent linearity for a wide range of light intensities and also simple operating circuits.
There are two main types of PSDs available: one-dimensional and two-dimensional.
Key Features
- Converts the position of a light or radiation spot into signal currents
- Outstanding position resolution and linearity
- Wide range of spectral response
- Works with a wide range of light or radiation intensities
- Short response time
- Measures light or radiation intensity and position simultaneously
- Independent of light or radiation spot focus
- High dynamic range
Quick reference data
| Position non-linearity | +/-0.3% |
| Detector resistance | 10 kohm |
| Part. No | Description | Active area (mm) | Leakage current (nA) | Noise current (pA/Hz) | Capacitance (pF) | Rise time (10-90%) (µs) | Standard package |
|---|---|---|---|---|---|---|---|
| S2 – 0001 | 2L2_MP1 | 2×2 | 50 | 1,3 | 7 | 0,03 | TO-8 |
| S2 – 0032 | 2L2_CP4 | 2×2 | 50 | 1,3 | 7 | 0,03 | 4-pin ceramic |
| S2 – 0002 | 2L4_MP1 | 4×4 | 50 | 1,3 | 20 | 0,08 | TO-8 |
| S2 – 0024 | 2L4_CP5 | 4×4 | 50 | 1,3 | 20 | 0,08 | 4-ceramic |
| S2 – 0184 | 2L4_SU71 | 4×4 | 50 | 1,3 | 20 | 0,08 | SMD |
| S2 – 0003 | 2L10_SU7 | 10×10 | 100 | 1,3 | 90 | 0,4 | Substrate |
| S2 – 0033 | 2L10_CP6 | 10×10 | 100 | 1,3 | 90 | 0,4 | 4-pin ceramic |
| S2 – 0185 | 2L10_SU72 | 10×10 | 100 | 1,3 | 90 | 0,4 | SMD |
| S2 – 0004 | 2L20_SU9 | 20×20 | 200 | 1,5 | 360 | 1,6 | Substrate |
| S2 – 0023 | 2L20_CP7 | 20×20 | 200 | 1,5 | 360 | 1,6 | 4-pin ceramic |
| S2 – 0196 | 2L45_SU24 | 45×45 | 400 | 1,5 | 1600 | 7,0 | Substrate |
PSD with Enhanced UV respons
| Part. No | Description | Active area (mm) | Leakage current (nA) | Noise current pA/Hz | Capacitance (pF) | Rise time (10-90%) (µs) | Standard package |
|---|---|---|---|---|---|---|---|
| S2 – 0030 | 2L2UV_MP1 | 2 x 2 | 50 | 1,3 | 7 | 0,03 | TO-8 |
| S2 – 0006 | 2L4UV_MP1 | 4 x 4 | 50 | 1,3 | 20 | 0,08 | TO-8 |
| S2 – 0016 | 2L10UV_SU7 | 10 x 10 | 100 | 1,3 | 90 | 0,4 | Substrate |
| S2 – 0034 | 2L20UV_SU9 | 20 x 20 | 200 | 1,5 | 360 | 1,6 | Substrate |
Common data for all SiTek PSDs
| Thermal drift, typical | 20 ppm/°C for 1L-series and 40 ppm/°C for 2L-series |
| Bias voltage | 5 – 20 V |
| Maximum operating temp. | 70° C |
| Maximum storage temp. | 100° C |
Application Areas
Application areas using SiTek PSD include non-contact distance measurement systems based on triangulation, alignment and surface level measurement, position and motion measurement, optical spectrum analysis, three-dimensional machine vision for contour mapping, and angle measurement systems.
Custom Solutions
Need a solution tailored to your project? We can make it happen. Our R&D engineers can customize our technology to meet your specific requirements. Simply complete the contact form, and a member of our team will be in touch shortly.
