Electronic control cartridge and method of simulating light...

Details Electronic control cartridge and method of simulating light... Electronic control cartridge and method of simulating light...

G - Physics

01

N

G01N 37/00 (2006.01) G01J 3/42 (2006.01) G01N 21/27 (2006.01)

Patent

CA 2062338

BIOT-034/00 CA ELECTRONIC CONTROL CARTRIDGE AND METHOD OF SIMULATING LIGHT TRANSMISSION PATTERNS ABSTRACT OF THE DISCLOSURE The invention provides devices and methods for electronically simulating a standard absorbance value in an analytical instrument that measures absorbance of light in order to verify the correct operation of the instrument. A liquid-crystal/- polarizing-filter combination located in the light pathway normally occupied by sample is used, along with sufficient voltage changes to selectively block and transmit light through the liquid crystal, thereby causing a light detector in the analytical instrument to read transmitted and blocked values of light. calculation then is used to determine whether proper operation of the instrument has occurred. Different absorbance values, as well as different patterns of varying transmission (such as exponential decay), can be simulated by causing the liquid crystal to switch from absorbance to transmission (or vice versa) at different times. 20432792

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