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Method for testing linearity of receiving channel in alternating current electromagnetic tracking equipment

A receiving channel and tracking equipment technology, applied in the field of electromagnetic tracking, can solve problems such as high purity requirements, deviation of linearity calculation results, cumbersome process, etc., and achieve the goals of reducing the influence of electromagnetic interference, good repeatability, and ensuring accuracy Effect

Active Publication Date: 2021-06-08
BEIJING HUAHANG RADIO MEASUREMENT & RES INST
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Problems solved by technology

This test method is cumbersome, time-consuming and costly
Especially for the separate test of the conditioning acquisition circuit, it is necessary to receive a single-ended input signal from an AC constant voltage source device, which is easily affected by external noise interference and cause deviations in the linearity calculation results, so the requirements for the purity of the electromagnetic environment of the test site are relatively high , low test repeatability

Method used

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  • Method for testing linearity of receiving channel in alternating current electromagnetic tracking equipment
  • Method for testing linearity of receiving channel in alternating current electromagnetic tracking equipment

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] The test equipment used in this embodiment builds an environment such as figure 1 As shown, the test equipment used are: AC constant voltage source, solenoid, digital multimeter and host computer. Among them, the AC constant voltage source outputs a voltage signal in the form of a point frequency to drive the solenoid to work, so that it generates a uniform alternating magnetic field in the inner central area; the digital multimeter is connected in series on the signal return path between the constant voltage source and the solenoid , used to measure the magnitude of the solenoid drive current, that is, to calibrate the alternating magnetic field strength inside the solenoid; the host computer receives the amplitude data output from the sens...

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Abstract

The invention provides a method for testing linearity of a receiving channel in alternating current electromagnetic tracking equipment. Test equipment comprises an alternating current constant voltage source, a solenoid, a digital multimeter and an upper computer. The effective value of the driving current of the solenoid and the output amplitude of the receiving channel are collected to form the calibration curve of the receiving channel, then the fitting straight line of the receiving channel is obtained by adopting the least square principle, and finally the linearity index of the receiving channel to be measured is obtained through calculation. The method adopts an integrated form, is convenient to operate and low in test cost, has no strict requirements on sites, and has good repeatability.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic tracking, and in particular relates to a linearity testing method for a receiving channel in an AC electromagnetic tracking device. Background technique [0002] AC electromagnetic tracking technology is often used in short-distance precision positioning systems, using alternating magnetic fields to obtain the position and spatial attitude information of target objects, so as to realize positioning and tracking with five degrees of freedom or six degrees of freedom, which can be applied to interventional surgery navigation and movement track field. The AC electromagnetic tracking device mainly includes a magnetic field source, a magnetic sensor, a sensor interface unit and a signal processing unit. Among them, the magnetic field source is responsible for generating the alternating magnetic field located in the target space; the magnetic sensor and the sensor interface unit are connected t...

Claims

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Application Information

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IPC IPC(8): G01R35/00
CPCG01R35/005
Inventor 赵川张硕云峰钱宇徐玉峰许振丰
Owner BEIJING HUAHANG RADIO MEASUREMENT & RES INST
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