Doppler radar-based non-contact type vibration measuring method

A Doppler radar, non-contact technology, applied in the field of non-contact vibration measurement based on Doppler radar, can solve the problems of inability to adapt to vibration monitoring, high equipment cost, poor low-frequency response ability, etc., and achieve good low-frequency measurement Sensitivity, compact structure, and strong environmental adaptability

Active Publication Date: 2017-05-10
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

The acceleration sensor measures the acceleration of the contact target and obtains the relative displacement of the measured object after integration. However, the commonly used accelerometers have poor low-frequency response capabilities and cannot be used effectively in special environments such as weightlessness. There are often man

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  • Doppler radar-based non-contact type vibration measuring method

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Embodiment Construction

[0039] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0040] Such as figure 1 As shown, the embodiment of the present invention provides a non-contact vibration measurement method based on Doppler radar, comprising the following steps:

[0041] S1. Transmitting single-frequency microwaves in the form of continuous waves to the vibrating object under test, and receiving radar echoes modulated by vibration movements;

[0042] The carrier frequency of the microwave radar used can be selected and determined according to the measurement sensitivity requi...

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Abstract

The invention discloses a Doppler radar-based non-contact type vibration measuring method. The method includes the following steps: S1. directly facing a measured vibration object to emit single-frequency microwaves in the form of continuous waves, and receiving radar echoes after modulation by vibration motion; S2. performing amplifying, filtering and quadrature mixing on echo signals and taking down conversion signals to obtain two paths of baseband signals I(t) and Q(t); S3. performing data collection on the baseband signals to obtain discrete digital signals; and S4. performing phase demodulation processing on the discrete baseband signal I[n] and Q[n], and extracting vibration amplitude and frequency information. The Doppler radar-based non-contact type vibration measuring method provided by the invention uses a microwave radar to perform non-contact type vibration measurement based on a Doppler effect, has good low frequency measurement sensitivity, is high in environmental adaptation, and can perform accurate vibration measurement under the condition of containing a barrier. The microwave radar used by the method is compact in structure and low in cost and has relatively low power consumption, thereby providing a solution to integration of a large-scale vibration measuring system.

Description

technical field [0001] The invention relates to the technical field of vibration measurement and analysis, in particular to a non-contact vibration measurement method based on Doppler radar. Background technique [0002] Vibration is a ubiquitous physical phenomenon in nature. Vibration measurement has been widely used in many fields of engineering technology, such as condition monitoring and fault diagnosis of various mechanical systems, low-frequency vibration monitoring of large flexible structures, and vibration and noise testing and analysis. Inhibition etc. In order to meet various vibration measurement needs, various sensors have been developed, and various vibration measurement technologies have been developed. The current vibration measurement methods can be divided into contact and non-contact measurement, among which acceleration sensors are widely used in contact measurement. The acceleration sensor measures the acceleration of the contact target and obtains th...

Claims

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/00
Inventor 彭志科熊玉勇
Owner SHANGHAI JIAO TONG UNIV
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