This single element detector is effective in sensing wavelengths between 300 nm and 1000 nm and 1000 nm and 2600 nm. This unit has a high performance photodiode operated at ambient temperature with a dual gain FET input transimpedence amplifier on the silicon channel and a dual gain follower on the PbS channel. Please note that it is available in various sensor area sizes and has an available thermo-electric cooler for lower dark current and improved signal to noise. The output is an analog signal available through a BNC connector at the back of the detector housing. Since the signal is analog, an optional 12-bit and 16-bit data acquisition system and software is available to digitize its output into a computer. A DC power supply for this detector (sold separately) is also required. This detector is designed for use with scanning monochromators to capture the intensity of one wavelength at a time. An optional mount allows it to mate to any of the Sciencetech scanning monochromators. Sciencetech can also provide an optional custom mount for mating to non-Sciencetech monochromators and spectrographs. The output voltage of the silicon channel is proportional to the signal current:
V_out = I_signal . R_f .
The PD/AMP is a DC coupled dual gain system, while the PbS photoconductive channel is dual gain AC coupled. Care should be taken in shielding the unit from stray light during operation to prevent saturation of the amplifier (and potential failure).
Technical Specifications

• Detector Type: 2.5 mm dia Si Photodiode ; 2 x 2 mm PbS Photoconductor
• Operating Temperature: 22°C
• Operating Wavelength: 0.3 – 1.0 µm; 1.0 – 2.6µm
• Responsivity: 0.6 x 10⁸ / 0.6 x 10⁷ V/W; 5 x 10⁶ / 10⁵ V/W
• Noise: 1.2 x 10^-6 / 1.2 x 10^-7 V/Hz^½; 15 x 10^-6/ 10^-7V/Hz^½
• Power Requirements: ± 9 VDC to ± 15 VDC
• Connections: Two shielded signal cables terminated with a BNC.
  Shielded power cable terminated with a DB-9 connector
  directly couples the unit with the PS-1 Low Noise Power Supply.