CN201965186U - Portable non-contact static electricity measuring device based on ultrasonic technology - Google Patents

Abstract

The utility model relates to a portable non-contact static electricity measuring device based on the ultrasonic technology; the device comprises a power supply module, a non-contact static electricity measuring circuit, an ultrasound range-measuring circuit, a data processing and control circuit and a displayer, wherein the non-contact static-electricity-measuring circuit comprises a static electricity sensor and a high impedance amplifying circuit; the ultrasound range-measuring circuit comprises an ultrasound transmitting, receiving and amplifying processing circuit; the device combines the ultrasound range-measuring technology and an inductive type static electricity measuring principle, establishes a relationship between a displayed static electricity voltage Ux and an induced voltage Ug and a fitting formula between a conversion coefficient k and a distance d, realizes a displayed numerical value basically equal to the static electricity voltage of a tested static electricity body by using the technology of a single-chip microcomputer through the signal processing of the circuit, programming operation and display control, and solves the problem of fussy distance value conversion of a common non-contact static electricity measuring instrument. The device adopts an integration structure design and is portable, simpler and more convenient to operate and use.

Description

A kind of portable non-contacting electrostatically measurement mechanism based on ultrasonic technique

Technical field

The utility model belongs to ultrasonic technique and electrostatic measurement technical field, relates to a kind of portable non-contacting electrostatically measurement mechanism based on ultrasonic technique that is widely used in the contactless electrostatic measurement of static object.

Background technology

At present, the measurement of electrostatic potential normally utilizes electrostatic voltmeter, comprise contact and contactless electrostatic voltmeter, contact type measurement is the measurement that tested static body directly is connected electrostatic voltmeter with cable, and the reading of voltage table is exactly by the current potential of tested static body with respect to the earth; Contactless electrostatic measurement principle is can not move freely by the electric charge in the air insulation medium, the current potential difference at variant position, the measurement of carrying out with electrostatic induction or air ionization principle.The former is with measurement rapier contact static body, measures its surface potential, and the latter utilizes electrostatic induction principle technology, measures the above earth potential of electrified body.

In the prior art before the utility model, contactless electrostatic voltmeter of being sold on the market or electrostatic measurement instrument, as explosion-proof electrostatic voltmeter of EST101 type etc., in carrying out electrostatic measurement, the numerical value that instrument shows, pass through measuring distance, the conversion coefficient that provides according to instructions converts, just can draw the electrostatic potential numerical value of tested static body, such measuring method, pattern, can be because the error of measuring distance, the electrostatic potential numerical value that causes drawing tested static body is not accurate enough, and surveying work is more loaded down with trivial details simultaneously.

Summary of the invention

Problem at above-mentioned contactless electrostatic voltmeter or the existence of electrostatic measurement instrument, the purpose of this utility model be to provide a kind of based on ultrasonic technique, can be implemented in the certain distance scope, be not subjected to that variable in distance influences non-contacting, directly show the portable non-contacting electrostatically measurement mechanism of tested electrostatic potential value, to solve because the error of measuring distance, problem such as the electrostatic potential numerical value of the tested static body that brings is not accurate enough, surveying work is more loaded down with trivial details.

Now the utility model technical solution is described below:

The utility model is based on the portable non-contacting electrostatically measurement mechanism of ultrasonic technique, have power module, data processing and the control circuit and the display that adopt battery powered mode that each circuit of device is powered, it is characterized in that: also have non-contacting electrostatically metering circuit, supersonic sounding circuit; Described non-contacting electrostatically metering circuit comprises electrostatic transducer and high impedance amplifying circuit, by the condenser type electrostatic induction pole plate of electrostatic transducer induction static body electrostatic potential, send the high impedance amplifying circuit after producing induced voltage signal; Described supersonic sounding circuit comprises ultrasound emission, reception and preposition amplification treatment circuit, and the distance by ultrasound emission, the tested static body of receiving circuit measurement mechanism distance produces the voltage signal that becomes corresponding relation with variable in distance and send preposition amplification treatment circuit; Described data processing and control circuit, form by AD converter, single-chip microcomputer, after converting digital signal to, the non-contacting electrostatically measurement voltage signal of high impedance amplifying circuit and preposition amplification treatment circuit being sent into by AD converter and the voltage signal of supersonic sounding circuit output send single-chip microcomputer to handle, by the fitting formula and the operational pattern computing of programming of design, the output digital signal is to display; Display is a LCD display, is used for the digital signal of video data treatment circuit output, can show electrostatic potential value and the distance value of being tested simultaneously in real time;

The electrostatic potential U that shows_xWith induced voltage U_gRelational expression is: U_x=kU_g

Conversion coefficient k with apart from the fitting formula of d be: k=0.0019d²+ 0.0511d+0.3172

Fitting formula is according to induction type electrostatic test instrument principle, and checking draws through test of many times.When tested static body electrostatic potential is constant, during the increasing apart from d of measurement mechanism and tested static body, conversion coefficient k increases, the electrostatic induction voltage U_gReduce, then U_xConstant, otherwise, then opposite; Therefore, U_xJust can be defined as the electrostatic potential value of tested static body.

The electrostatic potential U that shows_xSize with tested static body electrostatic potential value error depends mainly on k, d and U_gDegree of accuracy and accuracy; Wait measure by adding compensation, measuring error is further reduced; In 0.2kv～100kv scope, measuring error is less than 17%.

Device of the present utility model combines the supersonic sounding technology with electrostatic induction formula measuring principle, set up the electrostatic potential U that shows_xWith induced voltage U_gRelation, conversion coefficient k and fitting formula have been established apart from d, the utilization singlechip technology, signal Processing, programming computing and demonstration control by circuit, realized showing that numerical value equals the electrostatic potential of tested static body substantially, when having solved general non-contacting electrostatically measurement instrument and having measured, the problem that existing displayed value and measuring distance value convert; Adopted integrated structure design, realized portable, manipulate more easy.

Description of drawings

Fig. 1: the utility model is based on the theory diagram of the portable non-contacting electrostatically measurement mechanism of ultrasonic technique

Fig. 2: the utility model is based on the outside drawing of the portable non-contacting electrostatically measurement mechanism of ultrasonic technique

Wherein: 1 condenser type electrostatic induction pole plate, 2 casings, 3 displays, 4 ultrasound emission receivers, 5 insulating boots, 6 handles

Embodiment

Now tying accompanying drawing is described further embodiment of the present utility model:

Referring to Fig. 1: power module of the present utility model, adopt the 9V powered battery, and can charge by charger; The non-contacting electrostatically metering circuit adopts capacitive induction electrostatic transducer and CMOS amplifying circuit that the electrostatic transducer signal is isolated amplification, and induction static body electrostatic potential produces induced voltage signal; The supersonic sounding circuit, by UCM-T (R) 40 miniature ultrasonic emissions, receiving device, TL082 device amplifying circuit and LM1875 device makeup time treatment circuit, measurement mechanism produces the voltage signal that becomes corresponding relation with variable in distance apart from the distance of tested static body; Data processing and control circuit, by the voltage signal of non-contacting electrostatically metering circuit and supersonic sounding circuit output, to the fitting formula computing of programming, the output digital signal is to display by single-chip microcomputer.The electrostatic potential U that shows_xWith induced voltage U_gRelational expression is: U_x=kU_gDisplay adopts the LC128643 display, is used for the digital signal of video data treatment circuit output, can show electrostatic potential value and the distance value of being tested simultaneously in real time.

Referring to Fig. 2: the whole device contour structures of the utility model is combined into one capacitive induction electrostatic transducer and miniature ultrasonic emission, receiving device, is installed in the device front end; Display is in the face of the user; Hand holding handle is installed in the device below, and convenient the use operated.During use, turn on the power switch, after zero clearing is carried out on device aligning floor, just begin to measure; Hand-held device tries not to rock, and aims at tested static body and carries out electrostatic measurement; At this moment, capacitive inductionelectrostatic transducer 1, miniatureultrasonic transceiver 4,display 3 and internal circuit are started working, to be shown basicly stable after, it shows that numerical value is tested static bulk voltage value.After the battery charge, can work 4 hours; Finding range is within 20～80 (cm).

Claims (4)

1. portable non-contacting electrostatically measurement mechanism based on ultrasonic technique, have power module, data processing and the control circuit and the display that adopt battery powered mode that each circuit of device is powered, it is characterized in that: also have non-contacting electrostatically metering circuit, supersonic sounding circuit; Described non-contacting electrostatically metering circuit comprises electrostatic transducer and high impedance amplifying circuit, by the condenser type electrostatic induction pole plate of electrostatic transducer induction static body electrostatic potential, send the high impedance amplifying circuit after producing induced voltage signal; Described supersonic sounding circuit comprises ultrasound emission, reception and preposition amplification treatment circuit, and the distance by ultrasound emission, the tested static body of receiving circuit measurement mechanism distance produces the voltage signal that becomes corresponding relation with variable in distance and send preposition amplification treatment circuit; Described data processing and control circuit, form by AD converter, single-chip microcomputer, after converting digital signal to, the non-contacting electrostatically measurement voltage signal of high impedance amplifying circuit and preposition amplification treatment circuit being sent into by AD converter and the voltage signal of supersonic sounding circuit output send single-chip microcomputer to handle, by the fitting formula and the operational pattern computing of programming of design, the output digital signal is to display.

2. a kind of portable non-contacting electrostatically measurement mechanism according to claim 1 based on ultrasonic technique, it is characterized in that: described data processing and control circuit are according to fitting formula, by AD converter, single-chip microcomputer, show electrostatic potential value and the distance value of being tested in real time by programming.

3. a kind of portable non-contacting electrostatically measurement mechanism based on ultrasonic technique according to claim 2 is characterized in that: described conversion coefficient k with apart from the fitting formula of d be: k=0.0019d²+ 0.0511d+0.3172; The operational pattern of setting up, i.e. electrostatic potential U of Xian Shiing_xWith induced voltage U_gRelational expression is: U_x=kU_g

4. according to claim 1 or 2 or 3 described a kind of portable non-contacting electrostatically measurement mechanisms based on ultrasonic technique, it is characterized in that: adopt the structural design that capacitive induction electrostatic transducer and miniature ultrasonic are launched, receiving device is combined into one, be installed in the front end of device; Display is in the face of the user; Hand holding handle is installed in the device below.

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