Colour monitoring

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G - Physics

01

J

G01J 3/50 (2006.01) G01N 21/25 (2006.01) G01N 21/27 (2006.01) G01N 21/78 (2006.01) G01J 1/16 (2006.01) G01J 1/44 (2006.01)

Patent

CA 2058432

2058432 9015972 PCTABS00003 Colour changes in a target, such as a chemical sensor using a colour-changing indicator reagent to detect the presence of a poisonous gas, are continuously monitored by reflecting the target (10) on to a sensor (16) light originating from first one and then another light source (12a, 12b, etc), each having a different, known emission wavelength. In each cycle, direct light from the appropriate source is also collected by another sensor (14), connected in a closed loop (26) with circuitry in which the emission intensity is compared with a known reference value (38) and which adjusts the emission intensity so as to stabilise it at this constant reference value. Once this is stabilised, the reflected light intensity signal is passed to a data store (20), after which a divider (22) produces an output signal (36) representing the ratio of the reflected light intensities in two separate cycles originating from two different light sources (12a, 12b, etc). The conduct of each cycle is controlled by timing means (18). Where there are two light sources, the wavelength of the second (12b) is outside the response range of the target, that of the first (12a) being at or near the peak target response, so that all the divider output signals represent successive values of actual reflected light intensity. These signals can be processed to show the rate of colour change in the target and used to operate e.g. an alarm.

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