ABSORPTIOMETRIC SENSOR

Japanese Patent JPH01189547

A

PURPOSE:To reduce a drift of an output from a light-sensing element to be small sufficiently and thereby to lessen a measuring error, by providing the light-sensing element with a glass heater and by keeping it at a prescribed temperature by using a temperature regulator. CONSTITUTION:A sensor is equipped with a transparent cell 2 in which a liquid 1 to be measured is put. A light emitted from a high-luminance lamp 6 provided in a case of a light-emitting unit 5 set in close contact with one side of the cell 2 passes through an optical filter 7 and then through the liquid 1 in the cell 2. On the other side of the cell 2, a light-sensing unit 8 is set in a position opposite to the light-emitting element 5, and the light passing through the liquid 1 to be measured is introduced thereinto. A light-sensing element 9 is provided in a case of the light-sensing unit 8, and a glass heater 10 is provided in front of the light-sensing element 9. The glass heater 10 has a glass substrate 11 and a transparent SnO2 film 12 and generates a heat under the impression of a voltage by a DC power source 13. The DC power source 13 is connected with a temperature regulator 14 and the set temperature thereof is set at a desired temperature according to the temperature of the liquid 1 to be measured which passes through the cell 2. Thereby the light-sensing element 9 is kept invariably at a prescribed temperature.

YOSHIZAWA IZURU
OZAWA SUNAO
YAMAGUCHI NOBORU

JP1282288A

July 28, 1989

January 23, 1988

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MATSUSHITA ELECTRIC WORKS LTD

G01J1/02; G01N21/01; G01N21/27; G01N21/59; (IPC1-7): G01J1/02; G01N21/01; G01N21/59

Takehiko Matsumoto

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