CORRECTING METHOD FOR CHARACTERISTIC OF INFRARED RAY SENSING ELEMENT

Japanese Patent JPH04105024

A

PURPOSE:To lessen dispersion of the sensitivity from an infrared ray sensing element to element by calculating the reference output value, in accordance with the output signal value, from two reference output values, displacement from the regional boundary till the output signal value, and the width of region, and by emitting the result from calculation as a correction value. CONSTITUTION:When an m-bit output signal value Xi is fed from an infrared sensing element, a region calculating part 12 generates a displacement D from the regional boundary value and regional No. to which the signal value Xi belongs. A reference output value reading pat 13 reads two reference output values b1, b1+l according to the boundary value of the region out of a reference output value memory part 11, and these read values are entered into a corrective calculation part 14. This calculating part 14 performs a proportional calculation using the entered two reference output values b1, b1+l, displacement D, and the width W of region to determine the reference output value Yi={D.(b1+l-bi)/W}+bi in the reference input characteristics according to the output signal value Xi of infrared ray sensing element, and the output value Yi is given as a corrective value. This lessens dispersion of the sensitivity from infrared sensing element to element.

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SHITAMAE HIROKI
NAKAMURA OSAMU
NISHIHATA MAKOTO

JP22278390A

April 07, 1992

August 24, 1990

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FUJITSU LTD

G01J3/02; G01J1/02; G01J1/44; G01N21/27; (IPC1-7): G01J1/02; G01J1/44; G01J3/02; G01N21/27

Chika Saito

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