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Strain measuring system resisting strong electromagnetic interference

A strong electromagnetic interference and strain measurement technology, applied in the field of strain measurement systems, can solve problems such as damage to measurement equipment and strain measurement interference, and achieve the effects of ensuring equipment safety, reducing impact, and accurate and reliable strain measurement results.

Inactive Publication Date: 2016-12-21
XI AN JIAOTONG UNIV
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Problems solved by technology

For example, when the pulse discharge shock wave method is used for reservoir reconstruction, the electric pulse device converts electrical energy into shock wave energy, and high voltage and high current discharge is accompanied by strong electromagnetic pulse radiation, causing great interference to strain measurement
Because the strain probe just constitutes a loop for picking up strong electromagnetic pulses, due to the law of electromagnetic induction, an electromagnetic pulse much larger than the strain signal to be measured will be generated in the loop, and this electromagnetic pulse may destroy the measuring equipment

Method used

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Embodiment Construction

[0019] The present invention is described in further detail below in conjunction with accompanying drawing:

[0020] see figure 1 , the anti-strong electromagnetic interference strain measurement system of the present invention includes a front-end magnetic field compensation strain probe 1-1, a Wheatstone bridge box 1-3, and a strain signal conditioning circuit 1-2 connected sequentially through a double-layer double-core shielded cable 1-2 4. A / D converter 1-5 and terminal recording equipment 1-6; the double cores of double-layer double-core shielded cable 1-2 are respectively connected to the two upper adjacent arms of Wheatstone bridge box 1-3; Wheatstone The bridge box 1-3 is connected to a 5V DC power supply; the strain signal conditioning circuit 1-4 is composed of a fifth-order Butterworth filter amplifier and a voltage follower. The shells of Wheatstone bridge boxes 1-3 are metal shells and grounded. The terminal recording device is a computer or an oscilloscope. T...

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Abstract

The invention discloses a strain measuring system resisting strong electromagnetic interference. The strain measuring system mainly comprises a front-end magnetic field compensation strain probe, a double-layer shielded cable, a rear-end signal processing circuit and recording equipment, wherein the front-end magnetic field compensation strain probe mainly comprises an operating plate, a compensating plate and a shielding shell, and is used for compensating for strong electromagnetic interference and temperature interference in the environment; the shielding shell is used for protecting a strain gage, reducing high-frequency electromagnetic interference, and improving measurement accuracy; the rear-end signal processing circuit and the recording equipment include a Wheatstone double-arm bridge, a fifth-order Butterworth low-pass filter, a voltage follower, an A / D converter and terminal recording equipment; the cut-off frequency of the fifth-order Butterworth low-pass filter is 10kHz, and the fifth-order Butterworth low-pass filter is used for further filtering out high-frequency electromagnetic interference; and the voltage follower is used for isolating electromagnetic pulse surge to protect rear-end equipment. The strain measuring system realizes safe and accurate measurement of strain signals through adopting three technical means of front-end compensation, transmission shielding and back-end filtering.

Description

【Technical field】 [0001] The invention belongs to the field of high-power pulse measurement and relates to a strain measurement system resistant to strong electromagnetic interference. 【Background technique】 [0002] Based on high-power pulse technology, an electric pulse device is used in the wellbore to generate shock waves. When the amplitude of the shock wave is greater than the fatigue fracture strength of the rock and lasts for a period of time, the rock can be fractured. In the research, it is necessary to detect non-electrical information such as shock wave amplitude, pulse width, and strain propagating in the rock formation. Among them, strain measurement, as a measurement method for analyzing and researching mechanical strength, occupies an important position in many fields such as ensuring the safe operation of mechanical equipment and realizing automatic detection and control. [0003] Based on Ohm's law, C Wheatstone in England invented the Wheatstone bridge in...

Claims

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Application Information

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IPC IPC(8): G01B21/32G01N3/02
CPCG01B21/32G01N3/02
Inventor 刘巧珏周海滨张永民
Owner XI AN JIAOTONG UNIV
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