Cell Golay , OAP (optoacoustic transducer) - radiation receiver, used mainly in infrared spectroscopy. The basis of the measurement range: terahertz and near infrared radiation . The detector consists of a small metal cylinder , covered with a darkened metal plate on one side and a flexible metallized diaphragm on the other. The cylinder is filled with xenon and sealed. As soon as infrared radiation falls on a darkened metal plate, the gas heats up and its pressure increases. This leads to deformation of the diaphragm separating the two cameras. The light from the lamp, falling on the aperture, is reflected from it on the photodetector. The movement of the diaphragm changes the magnitude of the reflected flow. [one]
Advantages and disadvantages
The main advantage is that the used wavelength range is quite wide. The response is mostly linear in the entire work area. This detector also has a rather short response delay time, of the order of 10 ms.
Among the shortcomings can be noted its relatively high cost and cumbersome installation (which includes, in addition to the OAP, a power supply unit for it, a set of filters and connecting wires).
Notes
- ↑ Marcel JE Golay, 1947 Rev. Sci. Instrum. 18, 347