Pyroelectric radiometers with noise-equivalent-power (NEP) close to 1 nW/Hz¿ have been developed to measure less than 1 microwatt radiant power levels at room temperature to 25 micrometer. The radiometers will be used as transfer standards for routine spectral responsivity calibrations in the infrared range at the output of a traditional monochromator. Dome input-optics are used with multiple beam reflections to increase absorptance and to minimize structures in the spectral responsivity function. The temperature of the pyroelectric detector is stabilized with a thermoelectric cooler/heater. Spectral power responsivity calibrations were performed with two different methods. A Fourier Transform Spectrometer using its Infrared Reference Integrating Sphere System based method was validated with a continuously variable filter-monochromator based detector-comparison method using earlier developed pyroelectric radiometer standards. A responsivity uncertainty of 1.4 % (k=2) was obtained between 2 and 14 micrometers.
Proceedings Title: SPIE IR Sensors and Systems Conference
Conference Dates: April 25-29, 2011
Conference Location: Orlando, FL
Conference Title: SPIE Defense, Security and Sensing
Pub Type: Conferences
infrared, low-NEP, pyroelectric, reference detector, reflecting dome, spectral responsivity, temperature control, transfer standard