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Fan speed measurement system

A technology for measuring system and fan speed, which is applied in the field of measurement system, can solve problems such as inaccurate measured speed and achieve the effect of avoiding interference

Inactive Publication Date: 2013-07-03
HONG FU JIN PRECISION IND WUHAN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, a stroboscope is usually used to measure the rotational speed of the fan, but such measurement is easily interfered by external light, resulting in inaccurate measured rotational speed

Method used

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Examples

Experimental program
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Embodiment Construction

[0012] see figure 1 A preferred embodiment of the fan speed measurement system of the present invention includes a control unit 10, a light emitting unit 20, a sampling modulation unit 30, a communication unit 40, a host computer 50, a reflected light sensing unit 60 and a demodulation unit 70, the control unit 10 is respectively connected to the light emitting unit 20, the communication unit 40, the reflected light sensing unit 60 and the demodulation unit 70, the sampling modulation unit 30 is connected to the light emitting unit 20, and the host computer 50 is connected to the communication unit 40 .

[0013] The light-emitting unit 20 emits infrared light to a fan blade (not shown in the figure), and the fan blade is provided with a reflective material, which reflects the light to the reflected light sensing unit 60, and the reflected light sensing unit 60 receives the reflection After the corresponding signal is generated and counted, the speed of the fan is calculated. ...

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PUM

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Abstract

A fan speed measurement system comprises a control unit, a light emitting unit and an emitted light sensing unit, wherein the light emitting unit emits light to rotating fan blades of a fan; the emitted light sensing unit receives the light reflected by the fan blades and generates a corresponding sensing signal; the fan speed measurement system further comprises a sampling modulation unit and a demodulation unit; the sampling modulation unit is connected with the light emitting unit to allow the light emitting unit to emit the light according to a sampling frequency; and the demodulation unit modulates the sensing signal and transmits the sensing signal to the control unit.

Description

technical field [0001] The invention relates to a measuring system, in particular to a system for measuring the rotational speed of a fan. Background technique [0002] When measuring the working temperature of each component in the computer case, it is also necessary to measure the speed of the fan in the case, such as the speed of the graphics card fan, the speed of the power supply fan, etc. In the prior art, a stroboscope is usually used to measure the rotational speed of the fan, but such measurement is easily interfered by external light, which leads to an inaccurate measured rotational speed. Contents of the invention [0003] In view of the above, it is necessary to provide a fan speed measurement system with high measurement accuracy. [0004] A fan rotation speed measurement system, comprising a control unit, a light emitting unit and a light emission sensing unit, the light emission unit emits light onto the rotating blade of the fan, and the light emission sen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/486
CPCF04D25/0613F04D27/001G01P3/40G06F1/206
Inventor 高志勇吉海谊刘玉林
Owner HONG FU JIN PRECISION IND WUHAN CO LTD