Py-CAL Spectral Responsivity Standard (1-30µm)

  • Py-CAL Spectral Responsivity reference Standard 1-30µm

Calibrated in our dedicated laboratory, with respect to standards calibrated by the Physicalish Technische Bundesanstalt (PTB, Germany), a direct calibration to 20µm with an extension to 30µm is on offer.

Housing a 2x2mm active area DLATGS pyroelectric sensor fitted with a KRS5 window (0.6-40µm), the Py-CAL reaches parts of the infrared for which no photon detectors are available. Operated with the DH-PY-PSU power supply module with a low frequency chopped input, the signal generated by this detector is best measured in using the 496 DSP lock-in amplifier.

Core benefits


  • DTLAGS pyroelectric detector fitted with KRS5 window
  • 2x2 mm diameter active area
  • Spectral responsivity standard (V.W-1)
  • Operated in conjunction with the DH_PY_PSU
  • Recommended for use with the 400 Series of detection electronics


Material Deuterated lanthanum α alanine doped triglycine sulphate (DLaTGS)
Active area 2x2mm
Window material KRS5
Spectral response range 0.6-40µm
Operating mode Pyroelectric
Responsivity (typ.) 1750 V.W-1
D* (typ.) 1.15x109 cm√Hz.W-1
Max. operating temperature -20 to +55°C
Recommended chopping frequency 15 Hz


Measurement type Spectral responsivity
Wavelength range 1-20µm, extension to 30µm
Wavelength interval 50nm
Temperature at calibration 20°C
Traceability Physicalish Technische Bundesanstalt (PTB, Germany)
Calibration frequency Three yearly recommended


Connector Amphenol
Compatibility Four M3 clearance holes (Bentham slit pattern)


CALIBRATION-DH-PY Spectral responsivity calibration 1-20µm
CALIBRATION-DH-PY-EX Spectral responsivity calibration 1-30µm (includes extension 20-30µm)

Ordering Information

DH_PY Pyroelectric spectral responsivity standard
CAL-BRATION-DH-PY Spectral responsivity calibration 1-20µm
CALIBRATION-DH-PY-EX Spectral responsivity calibration 1-30µm
DH_PY_PSU Power supply module for DH_PY

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