LVDT / RVDT simulation and acquisition implementation method with recovery calibration function

Abstract

The invention discloses an LVDT / RVDT simulation and acquisition implementation method with a recovery calibration function. The method is characterized in that simulation and acquisition of signals are realized through an LVDT / RVDT acquisition simulation card; the LVDT / RVDT acquisition simulation card comprises a field programmable logic device, a digital-to-analog conversion (DAC) module, an analog filtering module, an analog adjusting module, an LVDT / RVDT interface module, an analog-to-digital conversion (ADC) module, a recovery filtering module, a recovery adjusting module, an external communication connector and a power supply module.

Description

Technical Field

[0001] The invention relates to the field of signal simulation and acquisition, and in particular to a LVDT / RVDT simulation and acquisition implementation method with a sampling calibration function. Background Art

[0002] LVDT / RVDT sensor is a differential displacement transformer used to convert mechanical signals into electrical signals. It has the advantages of high sensitivity, good linearity, high resolution, long life and high reliability, and is widely used in the aviation field. Since traditional instruments cannot directly simulate the signals of LVDT / RVDT sensors, the development of LVDT / RVDT simulation and acquisition products with acquisition and calibration functions has great significance and development prospects. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that there is a lack of LVDT / RVDT simulation and acquisition equipment with a recovery calibration function in the market.

[0004] The design scheme of the present invention is: A LVDT / RVDT simulation and acquisition realization method with a recovery calibration function, characterized in that: the simulation and acquisition of signals are realized by an LVDT / RVDT acquisition simulation card; The LVDT / RVDT acquisition simulation card includes: a field programmable logic device, a digital-to-analog conversion DAC module, an analog filter module, an analog adjustment module, an LVDT / RVDT interface module, an analog-to-digital conversion ADC module, a collection filter module, a collection adjustment module, an external communication connector, and a power supply module; Among them, the digital-to-analog conversion DAC module, the analog filtering module, and the analog regulation module together constitute the signal simulation module.

[0005] Among them, the analog-to-digital conversion ADC module, the acquisition filter module, and the acquisition adjustment module together constitute the signal acquisition module.

[0006] The signal acquisition module completes the digital processing of the collected analog signals in the specific implementation of LVDT / RVDT acquisition.

[0007] In the specific implementation of LVDT / RVDT simulation, the signal acquisition module completes the acquisition function, that is, the analog signal output by the signal simulation module is acquired, processed into a digital signal, and then transmitted back to the field programmable logic device 1, and compared with the original digital signal before simulation to determine the error.

[0008] The signal simulation process is: the field programmable logic device is the core control, the external communication device sends a position signal, the field programmable logic device performs calculation, the output displacement digital signal and the excitation digital signal are converted into a simulated LVDT / RVDT signal through the modulation of the signal simulation module, the signal acquisition module receives the simulated LVDT / RVDT signal and performs signal collection, and then automatically calibrates through the field programmable logic device, and the calibrated signal is output through the signal simulation module and the LVDT / RVDT interface module; the signal acquisition process is: the external device sends the LVDT / RVDT signal to the LVDT / RVDT interface module, which is sent to the field programmable logic device through the signal acquisition module, and then output to the external device through the external communication connector; the specific steps of the signal simulation process are as follows: Step 1: The external communication device sends position information, the field programmable logic device receives the information and performs signal calculation, and then outputs the displacement digital signal and the excitation digital signal; Step 2: After receiving the displacement digital signal and the excitation digital signal from the field programmable logic device, the digital-to-analog conversion DAC module converts the signal into a displacement analog signal and an excitation analog signal; Step 3: After the analog filter module receives the signal from the digital-to-analog converter DAC module, it filters out the analog LVDT / RVDT signal with effective frequency through filtering; Step 4: After receiving the signal sent by the analog filter module, the analog adjustment module operates on the analog LVDT / RVDT signal, modulates and outputs the analog LVDT / RVDT signal; Step 5: The output analog LVDT / RVDT signal is demodulated by the sampling adjustment module, and the sampling filter module performs frequency filtering on the signal; Step 6: The demodulated displacement analog signal and excitation analog signal are converted into digital signals through the analog-to-digital conversion ADC module, and then sent to the field programmable logic device for data comparison. When the error is less than the set error tolerance range, the signal is output to the LVDT / RVDT interface module through the signal simulation module, and then output to the external device by the LVDT / RVDT interface module, and then wait for the external communication device to send the next new position information; when the error is greater than the set error tolerance range, the field programmable logic device automatically calibrates, and then outputs the calibrated digital signal to repeat steps 2 to 6.

[0009] The LVDT / RVDT simulation and acquisition implementation method with a recovery calibration function is characterized in that the simulation and acquisition of signals are realized by an LVDT / RVDT acquisition simulation card, and the specific steps of the signal acquisition process are as follows: Step 1: The LVDT / RVDT interface module receives the external LVDT / RVDT signal and outputs it to the recovery adjustment module; Step 2: The signal acquisition module acquires the signal output by the LVDT / RVDT interface module; Step 3: The signal acquisition module is used to demodulate the amplitude of the signal, and the sampling filter module is used to filter the frequency of the signal; Step 4: FPGA reads and collects data; Step 5: Send the collected information to the external communication device through the external communication device connector.

[0010] The beneficial effects of the present invention are: The LVDT / RVDT simulation and acquisition implementation method with a sampling calibration function controls the simulation accuracy through the automatic calibration of a field programmable logic device. The present invention can perform sampling, simulation and acquisition, making it convenient for users to observe and process signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Hardware structure diagram of LVDT / RVDT acquisition simulation card.

[0012] Figure 2 Flowchart of simulation and mining functions.

[0013] Figure 3 Flowchart of the acquisition function. DETAILED DESCRIPTION

[0014] like Figure 1 and Figure 2 As shown, the LVDT / RVDT acquisition simulation card includes: a field programmable logic device 1, a digital-to-analog conversion DAC module 2, an analog filter module 3, an analog adjustment module 4, an LVDT / RVDT interface module 5, an analog-to-digital conversion ADC module 6, a collection filter module 7, a collection adjustment module 8, an external communication connector 9, and a power supply module 10.

[0015] Among them, the digital-to-analog conversion DAC module 2, the analog filtering module 3, and the analog regulating module 4 together constitute a signal simulation module.

[0016] Among them, the analog-to-digital conversion ADC module 6, the sampling filter module 7, and the sampling adjustment module 8 together constitute a signal acquisition module.

[0017] The signal acquisition module completes the digital processing of the collected analog signals in the specific implementation of LVDT / RVDT acquisition.

[0018] In the specific implementation of LVDT / RVDT simulation, the signal acquisition module completes the acquisition function, that is, the analog signal output by the signal simulation module is acquired, processed into a digital signal, and then transmitted back to the field programmable logic device 1, and compared with the original digital signal before simulation to determine the error.

[0019] The specific implementation method of LVDT / RVDT simulation is as follows: Step 1: The external communication device 9 sends position information, the field programmable logic device 1 receives the information and performs signal calculation, and then outputs a displacement digital signal and an excitation digital signal; Step 2: After receiving the displacement digital signal and the excitation digital signal from the field programmable logic device 1, the digital-to-analog conversion DAC module 2 converts the signal into a displacement analog signal and an excitation analog signal; Step 3: After receiving the signal from the digital-to-analog conversion DAC module 2, the analog filter module 3 filters out the analog LVDT / RVDT signal with effective frequency through filtering; Step 4: After receiving the signal sent by the analog filter module 3, the analog adjustment module 4 operates on the analog LVDT / RVDT signal, modulates and outputs the analog LVDT / RVDT signal; Step 5: The output analog LVDT / RVDT signal is demodulated by the sampling adjustment module 8, and the sampling filter module 7 performs frequency filtering on the signal; Step 6: The demodulated displacement analog signal and excitation analog signal are converted into digital signals through the analog-to-digital conversion ADC module 6, and then sent to the field programmable logic device 1 for data comparison. When the error is less than the set error tolerance range, the signal is output to the LVDT / RVDT interface module 5 through the signal simulation module, and then output to the external device by the LVDT / RVDT interface module 5, and then wait for the external communication device to send the next new position information; when the error is greater than the set error tolerance range, the field programmable logic device 1 performs automatic calibration, and then outputs the calibrated digital signal to repeat steps 2 to 6.

[0020] like Figure 3 As shown in the figure, the flow chart of the acquisition function, the specific processing process is: Step 1: The LVDT / RVDT interface module receives the external LVDT / RVDT signal and outputs it to the recovery adjustment module; Step 2: The signal acquisition module acquires the signal output by the LVDT / RVDT interface module; Step 3: The signal acquisition module is used to demodulate the amplitude of the signal, and the sampling filter module is used to filter the frequency of the signal; Step 4: FPGA reads and collects data; Step 5: Send the collected information to the external communication device through the external communication device connector.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A LVDT / RVDT simulation and acquisition implementation method with a recovery calibration function, characterized in that: The simulation and acquisition of signals are realized by the LVDT / RVDT acquisition simulation card. The simulation process of the signal is: the field programmable logic device is the core control, the external communication device sends a position signal, the field programmable logic device performs calculation, and the output displacement digital signal and excitation digital signal are converted into simulated LVDT / RVDT signals through the modulation of the signal simulation module. The signal acquisition module receives the simulated LVDT / RVDT signal and then performs signal acquisition. Then, the field programmable logic device performs automatic calibration, and the calibrated signal is output through the signal simulation module and the LVDT / RVDT interface module; the signal acquisition process is: the external device sends the LVDT / RVDT signal to the LVDT / RVDT interface module, which is sent to the field programmable logic device through the signal acquisition module, and then output to the external device through the external communication connector; the specific steps of the signal simulation process are as follows: Step 1: The external communication device sends position information, the field programmable logic device receives the information and performs signal calculation, and then outputs the displacement digital signal and the excitation digital signal; Step 2: After receiving the displacement digital signal and the excitation digital signal from the field programmable logic device, the digital-to-analog conversion DAC module converts the signal into a displacement analog signal and an excitation analog signal; Step 3: After the analog filter module receives the signal from the digital-to-analog converter DAC module, it filters out the analog LVDT / RVDT signal with effective frequency through filtering; Step 4: After receiving the signal sent by the analog filter module, the analog regulation module operates on the analog LVDT / RVDT signal, modulates and outputs the analog LVDT / RVDT signal; Step 5: The output analog LVDT / RVDT signal is demodulated by the sampling adjustment module, and the sampling filter module performs frequency filtering on the signal; Step 6: The demodulated displacement analog signal and excitation analog signal are converted into digital signals through the analog-to-digital conversion ADC module, and then sent to the field programmable logic device for data comparison. When the error is less than the set error tolerance range, the signal is output to the LVDT / RVDT interface module through the signal simulation module, and then output to the external device by the LVDT / RVDT interface module, and then wait for the external communication device to send the next new position information; when the error is greater than the set error tolerance range, the field programmable logic device automatically calibrates, and then outputs the calibrated digital signal to repeat steps 2 to 6.

2. A LVDT / RVDT simulation and acquisition implementation method with a recovery calibration function according to claim 1, characterized in that: The signal is simulated and collected through the LVDT / RVDT acquisition simulation card. The specific steps of the signal collection process are as follows: Step 1: The LVDT / RVDT interface module receives the external LVDT / RVDT signal and outputs it to the recovery adjustment module; Step 2: The signal acquisition module acquires the signal output by the LVDT / RVDT interface module; Step 3: The signal acquisition module is used to demodulate the amplitude of the signal, and the sampling filter module is used to filter the frequency of the signal; Step 4: FPGA reads and collects data; Step 5: Send the collected information to the external communication device through the external communication device connector.

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