Posted in | Spectrometers

TE-Cooled Spectrometer with Extended InGaAs Detector: Sol 2.2A

B&W Tek’s Sol™ 2.2A is a high-performance linear InGaAs array spectrometer that features 256 pixels and offers a wide dynamic range and high throughput, with TE cooling down to −15 °C through an integrated three-stage cooler.

All spectrometers feature a built-in 16-bit digitizer and an SMA 905 fiber optic input, while being USB 2.0 plug-and-play compatible. The integrated autozero function automatically decreases dark non-uniformity and dark current, leading to an enhanced signal-to-noise ratio.

Software control enables users to select from four kinds of operation modes—Maximum Sensitivity, Maximum Dynamic, High Sensitivity and High Dynamic. Besides this, custom-made spectral resolution and application support are available.


  • On-line analyzer
  • Quality control
  • NIR spectroscopy
  • Process monitoring
  • Material identification


  • Thermoelectric cooling of −15 °C
  • Spectral range from 900 to 2200 nm
  • Integrated autozero (noise level reduction)
  • Excellent resolution of 9.0 nm
  • Four sensitivity and dynamic range modes to suit particular application requirements


  • Fiber sample holders
  • Fiber patch cords
  • Fiber sampling probes
  • Light sources

Thermoelectric Cooler

An effective way to decrease noise and dark current is to cool an array detector with an integrated thermoelectric cooler (TEC). This method also improves the dynamic range and detection limit.

When the TEC is used to cool the InGaAs array detector from a room temperature of 25 °C down to −15 °C, the dark current is decreased by approximately 32 times, while the dark noise is decreased by around 5.7 times. This enables the spectrometer to detect weaker optical signals and function at longer exposure times.


Table 1. Source: B&W Tek

. .
DC Power Input 5 V DC @ 5 amps
AC Adapter Input 100 - 240 VAC 50/60 Hz, 1.0 A @ 120 VAC
Detector Type Linear InGaAs Array
Pixels 256 x 1 @ 50 µm x 250 µm per element
Spectrograph f/# 3.5
Spectrograph Optical Layout Crossed Czerny-Turner
Dynamic Range Maximum Dynamic mode: 25,000:1
High Dynamic mode: 12,500:1
High Sensitivity mode: 12,500:1
Maximum Sensitivity mode: 1,700:1
Digitizer Resolution 16-bit or 65,535:1
Readout Speed 500 kHz
Data Transfer Speed >300 spectra per second via USB 2.0
Integration Time 250 µs to >= 64 Seconds
External Trigger Aux port
Operating Temperature 0 °C - 35 °C
TE Cooling Three-Stage: -15 °C @ relative humidity = 90%
Weight ~ 3.1 lbs (1.4 kg)
Dimensions 7.5 in x 4.3 in x 2.7 in (192 mm x 109 mm x 68 mm)
Computer Interface USB 2.0 / 1.1
Operating Systems Windows: 7, 8, 8.1 (32-bit & 64-bit)




Image Credit: B&W Tek 

Entrance Slit

Table 2. Source: B&W Tek

Dimensions Approximate Resolution
1100 - 2200 nm
50 µm 50 µm wide x 1 mm high ~9.0 nm
100 µm 100 µm wide x 1 mm high ~18.0 nm
Custom slit widths available


Diffraction Grating

Table 3. Source: B&W Tek

Coverage (nm)
Grating Approximate Resolution
50 µm Slit
1100-2200 100/1600 9.0 nm
900-2200 85/1350 15.0 nm
Custom configurations available



The spectral data acquisition software, BWSpec®, features a broad range of tools developed to execute complex calculations and measurements at the touch of a button. The software enables users to select between multiple data formats and optimize scanning parameters, like the integration time.

Besides powerful data processing and data acquisition, the BWSpec® includes other features like manual/automatic baseline correction, spectrum smoothing and automatic dark removal.


Image Credit: B&W Tek  

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