NARROW BAND ELECTROMAGNETIC, PYROELECTRIC RADIATION DEVICES USING PIEZOELECTRIC DETECTORS

摘要

Radiation detection is accomplished by sensing the piezoelectric response to the expansion and contraction in a crystal element due to the heating effect of the carrier energy to be sensed. Sensitivity to a subcarrier is enhanced by utilizing a frequency (of interrupted or continuous wave subcarrier) corresponding with a mechanical resonance frequency of the crystal element. The device is analogous to a conventional resonant r.f. detector element. Uses to which such prior art devices are applied may also be served with the class of inventive devices. Such uses include frequency standards, channel selectors, etc.