G - Physics – 01 – N
Patent
G - Physics
01
N
73/51
G01N 21/59 (2006.01) G01M 11/00 (2006.01) G01N 21/15 (2006.01) G01N 21/53 (2006.01) G01W 1/00 (2006.01)
Patent
CA 1294148
(57) ABSTRACT OF THE DISCLOSURE Measurement equipment based on the measurement of light trans- mission are plagued by changing characteristics of protective glass surfaces due to contamination or other factors. In the method according to the invention, light transmission is meas- ured by sending light from a transmitter (1) and recording the received light intensity at a receiver (2), after which the light intensity is obtained by computational means. The inven- tion is characterized by launching light from light sources (5, 6) into protective glasses (3, 4) of the transmitter and the receiver so that the light rays are subjected to total internal reflection within the glasses, after which the inten- sities of the totally reflected light rays are measured by means of a detector (7, 8), and the obtained intensity values are used for correcting the intensity attenuation, effected by the protective glasses and their contamination onto the path from the transmitter to the receiver. The apparatus in accordance with the invention comprises light sources (5, 6) integral to the transmitter (1) and the receiver (2), with the light rays from the light sources adapted to enter the protective glasses in such a manner as to be subjected to a total internal reflection, and detectors (7, 8) for intensity measurement of the totally reflected light rays.
528378
Swabey Ogilvy Renault
Vaisala Oy
LandOfFree
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