Multipoint displacement simultaneous measuring method

A measurement method and displacement technology, applied in measurement devices, radio wave measurement systems, instruments, etc., can solve problems such as limited operating distance, circuit failure, and difficult separation of signals, and achieve fast real-time response, simple circuit structure, and measurement. high precision effect

CN104808170AActive Publication Date: 2015-07-29CHONGQING UNIV
4 Cites 5 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-07-29

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a multipoint displacement simultaneous measuring method, and a measuring system is shown in the figure. A reference point transmitting antenna is installed on the fixing position, and the surface of the measured object is equipped with multiple observation point transmitting antennae; a public radio frequency local oscillator generates a radio frequency carrier signal, a reference point beacon receiver directly transmits the radio frequency carrier signal through the reference point transmitting antenna, an observation point beacon receiver uses a low frequency sine wave signal to perform the double-sideband modulation to the radio frequency carrier signal, and sends it to the observation point transmitting antennae; the frequency of the sine wave modulating signal of each observation point beacon receiver is different; after receiving the mixed signal transmitted by the reference point transmitting antenna and the observation point transmitting antennae, a telemetering receiver uses the other radio frequency local oscillator to convert the frequency of the signal to the intermediate frequency, and digitize it, and then perform the Fourier transform to obtain its magnitude spectrum and phase spectrum, so that the carrier phase difference of each observation point signal and the reference point signal is calculated; and according to the phase difference variation of two times of previous and next measurement, the displacement of each observation point is calculated.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of structural health monitoring, and relates to a multi-point displacement simultaneous measurement method. Background technique

[0002] Large components such as power towers, skyscrapers, bridges, dams, and large aircraft will deform during use. Deformation measurement is a basic method for exploring deformation mechanisms and an important means for early warning of danger. Patent CN1271419C and patent CN101349753A summarize and analyze several common measurement methods, and point out that radio frequency technology has many advantages in deformation measurement.

[0003] Patent CN1271419C proposes a micro-displacement measurement method. The measurement system is composed of a passive corner reflector placed on the measured point and a microwave phase comparison device on the measured point. The displacement of the corner reflector is measured based on the phase difference between the microwave phase comparison d...

Examples

Embodiment Construction

[0012] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0013] figure 1 It is a structural block diagram of the measurement system of the present invention. The system consists of a transmitter circuit and a receiver circuit. The left part of the figure is the transmitter part, and the right part is the receiver part.

[0014] The transmitter includes a public radio frequency local oscillator 10, a reference beacon machine 11 and a reference point transmitting antenna 114, an observation point beacon machine 12,13,14 and an observation point transmitting antenna 124,134,144, etc.; the reference beacon machine is composed of a radio frequency bandpass amplifier 112 Composed of a power amplifier 113; the observation point beacon machine 12 is composed of a sine wave signal generator 120, a modulator 121, a radio frequency band-pass amplifier 122 and a power amplifier 123, and realizes that the lo...