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Constant-temperature type hot-film shear stress micro-sensor closed-loop feedback control system

A technology of micro-sensor and closed-loop feedback, which is applied in the direction of fluid pressure measurement through thermal devices, instruments, and measurement of fluid pressure. It can solve the problems of low resistance measurement accuracy and complicated debugging process, so as to avoid malfunction and reduce measurement errors. , the effect of reducing the difficulty of calibration

Active Publication Date: 2018-09-11
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0006] In order to overcome the shortcomings of the traditional design scheme such as complicated debugging process and low resistance measurement a

Method used

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Embodiment Construction

[0023] The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] The embodiment of the present application provides a design of a closed-loop feedback control system for a thermostatic hot film shear stress microsensor, including hardware and software.

[0025] refer to image 3, in the present embodiment, the closed-loop feedback loop of the thermostatic hot film shear stress microsensor consists of a fixed resistor 1, a flexible hot film shear stress microsensor 4, an analog operational amplifier 6, an instrument op...

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Abstract

The invention discloses a constant-temperature type hot-film shear stress micro-sensor closed-loop feedback control system, and belongs to the field of sensor measuring instruments. The adopted technical scheme of the invention comprises a hardware circuit design and an algorithm design of the hot-film shear stress micro-sensor closed-loop feedback control system. The hardware circuit is formed bya fixed resistor1, a flexible hot-film shear stress micro-sensor 4, a simulation operational amplifier 6, an instrument operational amplifier 7, a simulation multiplier 8, a microcontroller 9, and alow-noise amplifier 10. The algorithm design comprises threshold setting, design of an integration link and design of a proportion link. According to the constant-temperature type hot-film shear stress micro-sensor closed-loop feedback control system, through the design form of four-wire system measurement of the sensor resistance, the measuring error caused by a lead wire resistance of the hot-film shear stress micro-sensor is greatly reduced, and the calibration difficulty of the hot-film shear stress micro-sensor in a practical application process is reduced; besides, through dynamic and real-time adjustment of the algorithm of the microcontroller 9, the problems that according to a conventional design scheme, a self-excitation state is entered due to large-range change of the flow velocity of a flow field, and normal operation is failed are avoided.

Description

1. Technical field [0001] The invention relates to a closed-loop feedback control system of a thermostatic hot film shear stress microsensor, which belongs to the field of sensor measuring instruments. 2. Background technology [0002] During the operation of aircraft, ships and other aircraft, the frictional resistance encountered by the aircraft accounts for 50%-80% of the total resistance, and the frictional resistance affects the speed, energy consumption, carrying capacity, and maneuverability of the aircraft. Fluid wall shear stress is an important parameter to accurately express friction resistance and describe the flow state of fluid boundary layer. Its effective test is of great significance to the improvement of aircraft / vehicle design and experimental capabilities. [0003] As one of the important sensing devices of fluid flow measurement technology, the flexible hot film shear stress microsensor has the characteristics of high time / space resolution, attachability...

Claims

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Application Information

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IPC IPC(8): G01L9/02G01L11/00
CPCG01L9/025G01L11/002
Inventor 马炳和张浩王璇甫苑伟政姜澄宇邓进军罗剑
Owner NORTHWESTERN POLYTECHNICAL UNIV
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