JPH02280081A - Liquid detector - Google Patents

Abstract

PURPOSE:To simplify the device and also to obtain a stable operation by providing a light source and a reference refracting part and detecting a variation of a relational refractive index caused by whether an object to be detected exists or not. CONSTITUTION:In the case there is no liquid, a light beam emitted from a light emitting part a is made incident on a total reflection prism b. Due to the total reflection (n1.2) prism, the light beam is converted in the 90 deg. direction twice, led to a photodetecting part c and converted to a signal of no-liquid. In the case there is a liquid, a light beam emitted from the light emitting part a is made incident on the total reflection prism b. This prism is a total reflection prism in the air but since there is a liquid, it does not become the total reflection prism due to a variation of a relational refractive index and the light beam is radiated into the liquid at a deflection angle theta1.3 by a refractive index of n1.3, and not led to the photodetecting part. Accordingly, the light beam becomes a signal of liquid-existence.

Description

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Claims (1)

[Claims] 1) A method comprising a light source, a light receiving section, and a reference refraction section, and detecting a change in the relative refractive index depending on the presence or absence of an object to be detected. 2) Arranging the light source and the light receiving part via a total reflection prism,
A device that detects the difference in refractive index between the air and the object to be detected relative to the prism, and extracts it as a signal.