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Digital transmission demodulating method of differential transformer displacement transducer

A differential transformer type, displacement sensor technology, used in instruments, measuring devices, electrical devices, etc., can solve the problems of inability to obtain the position of the iron core, large errors, etc., to achieve high measurement accuracy and overcome the effects of excessive noise interference

Inactive Publication Date: 2011-04-13
BEIJING JINGHAIQUAN SENSING TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In this method, the original signal is rectified, added and subtracted to obtain a DC voltage signal, which will cause a large error and cannot obtain an accurate iron core position.

Method used

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  • Digital transmission demodulating method of differential transformer displacement transducer
  • Digital transmission demodulating method of differential transformer displacement transducer
  • Digital transmission demodulating method of differential transformer displacement transducer

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Embodiment Construction

[0027] Combine below image 3 , 4 An embodiment of the present invention is described in detail.

[0028] The present invention can be image 3 , 4 A transmitter implementation shown, the transmitter hardware mainly includes NIOSII CPU soft core, DDS, D / A converter, A / D converter, FLASH working state controller, FLASH and SRAM memory, active configuration chip , USB interface, CH452 display and keyboard, power supply, clock / reset. like image 3 , the hardware drawn in the dashed box is collectively referred to as FPGA on-chip hardware, and the hardware outside the box is collectively referred to as FPGA off-chip hardware.

[0029] This embodiment can measure 2 to 16 LVDT sensors at the same time. For specific implementation methods, see image 3 , Figure 4 ,Proceed as follows:

[0030] 1. Initialize each memory (FLASH and SRAM, etc.). The reason why FLASH is used to store data is because FLASH is a non-volatile memory, and data will not be lost after power failure, wh...

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Abstract

The invention relates to a digital transmission demodulating method of a differential transformer displacement transducer, belonging to a method for processing signals for accurately measuring the small displacement of an object by using an LVDT (Linear Variable Differential Transformer). The method comprises the following steps of: driving a primary coil of the LVDT by a transformer manufactured by a field programmable gate array (FPGA), collecting the output signals Va and Vb of two secondary coils of the LVDT, carrying out digital demodulation on the collected output signals Va and Vb of the two secondary coils of the LVDT in the formula of S=(Va-Vb) / (Va+Vb), and detecting signals of the LVDT by the mapping relationship between the actual displacement of the LVDT iron core and the S. The addition and subtraction as well as the demodulation method of the division are used on the secondary coil signals in the LVDT, and the actual displacement of the LVDT iron core is obtained by a moving average algorithm and the mapping relationship. The invention reduces the noise interference to the measuring result and greatly reduces the measuring error.

Description

technical field [0001] The digital transmission and demodulation method of a differential transformer type displacement sensor relates to a method for processing a signal for accurately measuring a small displacement of an object by using an LVDT. Background technique [0002] The differential transformer displacement sensor adopts the principle of electromagnetic induction to measure small displacements. Its English name is linear variable differential transformer, referred to as LVDT. Its structure is shown in figure 1 . Epoxy resin, stainless steel and other materials are used as the coil skeleton, and enameled wires of different wire diameters are used to wind coils on the skeleton. Different from traditional power transformers, LVDT is a measuring element with open magnetic circuit and weak magnetic coupling: a primary coil 1 and two secondary coils 2 are wound on the bobbin, and its working mode depends on the iron core 3 in the bobbin When the primary coil 1 supplie...

Claims

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Application Information

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IPC IPC(8): G01B7/02
Inventor 谢雪松柯志泉
Owner BEIJING JINGHAIQUAN SENSING TECH
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