Balanced / auto-balanced IR detection module

2.9 – 5.5 µm and over 1.8 MHz, with two HgCdTe thermoelectrically cooled, optically immersed photovoltaic detectors

NIPM-I-5 is an infrared detection module designed for differential optical signal detection. The device can operate in balanced and auto-balanced mode. This detection module uses two individual detectors based on HgCdTe heterostructure. These IR detectors (signal and reference) are precisely matched to achieve a very high Common Mode Rejection Ratio (CMRR). NIPM-I-5 is dedicated to operating in systems where excess noise of radiation dominates, e.g. in the laser and some FTIR spectrometers.

Spectral response (Ta = 20°C, Vb = 0 mV)


  • Two channels with similar spectral characteristics and frequencies
  • Manual change of balanced or auto-balanced mode
  • Low noise operation and high detectivity
  • Integrated with fans and thermoelectric cooler controllers
  • Single power supply
  • Compatible with optical accessories
  • Detectors type: PVI-4TE-5-1×1-TO8-wAl2O3-36


  • QCL lasers excess noise suppression in gas analysis

Specification (Ta = 20°C, Vb = 0 mV)

Typical value
Optical parameters
Cut-on wavelength λcut-on (10%) µm
Peak wavelength λpeak, µm
Optimal wavelength λopt, µm
Cut-off wavelength λcut-off (10%) µm
Detectivity D*(λopt, REF), cm⋅Hz1/2/W
Detectivity D*(λopt, SIG), cm⋅Hz1/2/W
Output noise density vn(100 kHz, RLoad = 50 Ω, REF), nV/Hz1/2
Output noise density vn(100 kHz, RLoad = 50 Ω, SIG), nV/Hz1/2
Electrical parameters
Voltage responsivity Rvopt, REF), V/W
Voltage responsivity Rv opt, SIG), V/W
Low cut-off frequency flo, Hz
High cut-off frequency fhi, MHz ≥1.8
Output impedance Rout (REF, SIG, BAL/A-BAL), Ω 50
Output voltage swing Vout (RLoad = 50 Ω), V 0.4
Output voltage offset Voff, mVDC
CMRR balance / reference (100 kHz), dB
CMRR auto-balance / reference (100 kHz), dB
Power supply voltage Vsup, VDC
Power supply current Isup, A
Other information
Active element material (REF and SIG)
epitaxial HgCdTe heterostructure
Optical area AO (REF and SIG), mm×mm
Window (REF and SIG)
Acceptance angle Φ (REF and SIG)
Ambient operating temperature Ta, °C
5 to 25
Reference output socket (REF)
Signal output socket (SIG)
Balanced / auto-balanced output socket 
Power supply  socket
DC 2.1/5.5
Mounting hole
yes (2 pcs)

Mechanical layout, mm

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