Self-oscillating fluid sensor

A sensor unit and fluid technology, applied in the direction of liquid/fluid solid measurement, instruments, scientific instruments, etc., can solve the problems of expensive hardware and energy consumption, and achieve the effects of offsetting error sources, accurate measurement values, and accurate time delays

Inactive Publication Date: 2005-05-04
HONEYWELL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And fixed frequency generators, high frequency timers, are quite expensive in terms of hardware and power consumption

Method used

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Examples

Experimental program
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Embodiment approach

[0072] Figure 10 The relationship between the oscillation rate and the flow rate of four known gases when using the sensor device in Fig. 9 is given in . The thermal conductivity and thermal diffusivity of the measured fluid can be obtained by determining the oscillation frequency under the condition of substantially zero flow. To measure these properties, it is necessary to relate the frequency of oscillation to the thermal conductivity of the fluid being measured using a predetermined relationship derived from known gas calibration information. For the illustrated embodiment, the thermal conductivity k of the measured fluid can be determined by the approximate relationship

[0073] k = 0.36 f - - - ( 1 )

[0074] or more generally

[0075] f = ( k ...

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Abstract

A method and apparatus for determining properties of said fluid using a self-oscillating fluid sensor. In a preferred embodiment, a sensor is provided that operates at a frequency that is related to the time-of-flight of temperature disturbances flowing through the fluid. Based on this transit time, selected fluidic properties of the fluid can be determined.

Description

technical field [0001] The present invention is concerned with determining properties of fluids, specifically thermal conductivity, thermal diffusivity, specific heat and fluid velocity of the fluid being measured. Background technique [0002] Several methods have been devised to measure fluid thermal conductivity, thermal diffusivity, specific heat, and fluid velocity. Typically, these properties are measured by using various types of detectors including resistive bridge type sensors. [0003] One method of determining thermal conductivity by placing a heating element on one arm of a Wheatstone bridge in a cavity through which a sample of the fluid being measured passes is described in U.S. Patent 4,735,082. The input voltage is varied by alternating current, voltage or power so that the heated element introduces a range of different amounts of thermal energy into the fluid being measured. In this way, changes in power consumption due to changes in the thermal properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/698G01F1/692G01F1/696G01N25/18
CPCG01F1/696G01F1/692
Inventor D·库比西尔克B·乌尔利希
Owner HONEYWELL INC
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