- Spectral response 800-1700nm
- 256 and 512 element arrays
- 50m x 500m pixels
- TE cooled/temperature stabilized
The IRA Series detection systems incorporate low noise 256 and 512 element InGaAs IR linear Arrays optimized for spectroscopic applications in the 800-1700nm range. They include TE coolers and controllers. The detector heads are air cooled. The detectors are cooled, and temperature stabilized to 5 degrees C to reduce noise and stabilize dark signal. These detectors are well suited for general spectroscopic measurements, and are ideal in most industrial applications for absorption measurements.
The IRA series of InGaAs Linear Array Detectors were developed for spectroscopic measurements in 800-1700nm range where many molecular systems have absorption and reflectance features. Although silicon based arrays can have response out to 1100nm, it is often impractical to use silicon detectors beyond 900nm in broadband measurements because of the rapid decrease in response.
This makes silicon detector based systems inordinately sensitive to stray light contamination from the 500-700nm range where silicon is orders of magnitude more sensitive than at 1100nm. By contrast InGaAs has a very high uniform quantum efficiency typically varying by less than 10% from its mean of 80% over its prime range of 950-1600nm. The response at 800nm is in the order of 4 times lower. The response below 800nm and above 1600nm falls rapidly, minimising the possible effect of stray light contamination from out of band spectral regions.
The IRA detector head contains the InGaAs linear array detector with an internal, one stage TE cooler module, the control and signal conditioning electronics, and a fan to provide air cooling. An external TE cooler control unit is connected to provide the current necessary to drive the TE module internal to the detector. The signals recorded on the array are transferred to a PC via a 12 bit USB or PCI interface. A range of software is available to support acquisition, control and analysis.
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