Sensing systems

Details Sensing systems Sensing systems

G - Physics

01

N

73/55

G01N 21/25 (2006.01) G01D 5/26 (2006.01) G01K 11/00 (2006.01) G01K 13/02 (2006.01)

Patent

CA 2020669

ABSTRACT OF THE DISCLOSURE Conventional pressure and temperature sensing probes have separate sensing elements mounted in the probe so that gas flows over the elements. In the present invention a single optical sensing element is used which is supplied with broad band optical radiation. Radiation transmitted by the element is supplied to three photodiodes responsive to radiation at different wavelengths. The transmission characteristic of the element varies in different ways with change in temperature and pressure respectively. A store of temperature and pressure against amplitude of radiation at- different wavelengths is addressed by the outputs of the photodiodes to give an indication of pressure and temperature at the element.

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