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Bolometer is a total radiation detector designed to measure energy losses. Bolometer should have a flat spectral response i.e. it is equally sensitive to radiation of any wavelength and any particle fluxes.
EXPORTED TO: Japan, NIFS – National Institute for Plasma Physics, Toki
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Pyroelectric bolometer is based on a Pyroelectric crystal (usually LiTaO3 or PZT) covered by absorbing layer (silver or silver blackened with carbon). Once the radiation is absorbed by pyroelectric bolometer and its temperature rises the polarization of dipolar domains inside the crystal changes to more chaotic which results in an electric current flowing across the crystal. The current (typically very small: 10-11 – 10-12 A) can be amplified by current to voltage converter based on operational amplifier. The amplifier should be placed as close as possible to the detector to reduce the noise. Pyroelectric bolometer is cheap and fast, has a real flat spectral sensitivity. Special precautions should be taken to avoid the noises caused by detector, cable and amplifier vibrations as well as electromagnetic noises. TUAP pyroelectric bolometer is coupled by a special low-noise cable, amplifier in a non-vibrating housing and data acquiring military computer working in a hard conditions – closely to thermonuclear reactor. |
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Number of channels |
2 detector arrays, 4 detectors in each array |
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Dynamic range |
0 ÷ 2 W/cm2 |
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Sensitivity |
5·10-5 |
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Frequency range |
10 ÷ 4000 Hz |
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Working temperature of sensor head |
15 ÷ 200 °C |
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Storing temperature of sensor head |
5 ÷ 230 °C |
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Power supply |
100 V / 60 Hz / 40 W |
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Length of cable inside vacuum |
1.5 m |
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Length of cable outside vacuum |
5 m |
