Method for detecting dripping droplet with refracted and reflect

Details Method for detecting dripping droplet with refracted and reflect Method for detecting dripping droplet with refracted and reflect

1987-07-14

1988-09-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356336, G01N 2186, G01N 1502

Patent

active

047711817

ABSTRACT:
A method for detecting a dripping transparent droplet which can preferably be applied to remotely and successively detect the leak of a liquid in a place inaccessible by a person. The method comprises subjecting parallel rays of light to enter the dripping droplet to generate light scattered from the droplet at a predetermined scattering angle, the scattered light being composed of light reflected by the surface of the droplet and light transmitted and refracted in the droplet and then emitted from the surface thereof. The scattered light is imaged on a one-dimensional photosensor by an optical imaging system to form in the image two luminescent spots resulting from the reflected light and the transmitted-refracted light and a diameter of the droplet is determined from a distance between two luminescent spots and a magnification of the optical imaging system.

REFERENCES:
patent: 3807870 (1974-04-01), Kalman
patent: 4595291 (1986-06-01), Tatsuno
patent: 4676638 (1987-06-01), Yasuda
patent: 4701051 (1987-10-01), Buchhave et al.
patent: 4709156 (1987-11-01), Murphy et al.
Bachalo, "Method for Measuring the Size and Velocity of Spheres by Dual Beam Light Scatter Interferometry", Applied Optics vol. 19, No. 3, 2/80, pp. 363-369.

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