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Supersonic metering method and device for liquid drop

A measurement method, droplet technology, applied in measurement devices, volume measurement instruments/methods, liquid/fluid solid measurement, etc., to achieve high accuracy and reliability, and small volume

Inactive Publication Date: 2007-12-26
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And it is not affected by the droplet dielectric coefficient

Method used

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  • Supersonic metering method and device for liquid drop

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Embodiment Construction

[0023] A preferred embodiment of the present invention is as follows: the drop metering device of the present embodiment comprises a liquid container 1 lower end connected with a throttle tube 2 to form a falling drop 3, which is characterized in that it is aligned with the throttle tube 2 Vertically below, a position sensor 4 and an ultrasonic sensor 5 composed of an ultrasonic transmitting end 5.1 and an ultrasonic receiving end 5.2 are arranged in sequence. The output port of the position sensor 4 is directly connected to the input port of a signal processing unit 7, and the output of the ultrasonic sensor 5 The port is connected to the signal processing unit via a converter 6 . The present invention is as follows to the detection work step of each droplet 3:

[0024] a. The droplet 3 falls vertically through the polar plate area in the ultrasonic sensor 5, so that the signal value C of the ultrasonic receiving end 5.2 of the ultrasonic sensor 5 changes, and the converter 6...

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Abstract

The present invention is supersonic metering method and device for liquid drop. Liquid from the tank and through the throttle pipe forms liquid drops and the liquid drops are made to pass through one position sensor to measure the initial liquid drop measurement time and one supersonic sensor comprising one supersonic emitter and one supersonic receiver to measure photosensitive change value during liquid drop falling. There are one converter to obtain the converted value and one signal processing unit to integrate the converter output values in certain periods so as to obtain the current liquid drop volume. The present invention is independent with the dielectric constant of the liquid drop, and has small size and high precision.

Description

technical field [0001] The invention relates to a liquid droplet metering method and device, in particular to a liquid droplet ultrasonic metering method and device. Background technique [0002] There are basically two kinds of measuring meters for existing liquid droplets. A kind of photoelectric counting droplet measurement, although simple, but because it only measures the number of droplets but not the volume of droplets, the accuracy and stability are poor; the second is capacitive droplet measurement (patent application number 200410016262.3), It uses capacitive detection of droplet volume, so droplet detection will be affected by droplet dielectric coefficient. Contents of the invention [0003] The object of the present invention is to provide an ultrasonic metering method and device for liquid droplets, which uses a throttling method to convert the liquid into vertically falling droplets, and uses the liquid droplets to change the signal size of the ultrasonic r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F22/00G01N29/02
Inventor 李斌李霞朱月明
Owner SHANGHAI UNIV