CN103149456A

CN103149456A - Handheld electromagnetic radiation tester

Info

Publication number: CN103149456A
Application number: CN2013100620438A
Authority: CN
Inventors: 姜秀坤
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-02-27
Filing date: 2013-02-27
Publication date: 2013-06-12

Abstract

The invention belongs to the technical field of the measurement of electromagnetic wave, and relates to a handheld electromagnetic radiation tester. The handheld electromagnetic radiation tester is technically characterized by comprising a 9V direct-current power supply, an electromagnetic sensing coil L, a primary amplification circuit, a secondary resistance-capacitance amplification circuit, a tertiary resistance-capacitance amplification circuit and a state indication circuit. The handheld electromagnetic radiation tester is used for judging the existence of electromagnetic radiation of an electric appliance, qualitatively testing and prompting the electromagnetic radiation intensity and testing the electromagnetic radiation pollution range. The handheld electromagnetic radiation tester has the characteristics of simplicity in circuit structure, no external power, convenience in test and operation and the like, can provide evidence for users to avoid the radiation source and can be used as a conventional electromagnetic radiation detection tool.

Description

The hand-held electromagnetic radiation tester

Technical field

The invention belongs to the electromagnetic wave measurement technical field, relate to a kind of hand-held electromagnetic radiation tester.

Background technology

Along with various wired, wireless electric equipments are constantly universal, the artificial electromagnetic radiation that produces is ubiquitous, common source has: alternating-current power supply transformer, house wiring, daylight lamp, televisor, micro-wave oven, electromagnetic stove, household PC, mobile phone, air-conditioning, hair-dryer etc., these electric equipments bring much simultaneously easily to us, and the electromagnetic radiation that they produce brings certain harm also for people's life and health.

The mode of hazards of electromagnetic radiation human body

Thermal effect: tissue is water more than 70%, and hydrone is subject to phase mutual friction after electromagenetic wave radiation, causes that body heats up, thereby affects the human internal organs normal operation.

Cumulative effect: after thermal effect acts on human body, the human injury not yet is able to do in time again to be subject to electromagenetic wave radiation before self-regeneration, its extent of injury will be accumulated, and just has in the course of time to jeopardize health.For the human body of Long Term Contact electromagenetic wave radiation, even radiation power is very little, frequency is very low, also may bring out to cause beyond thought all diseases.

In the multi-frequency electromagnetic wave, high band and than the consequence of strong-electromagnetic field effect on human body, to cause people's energy and strength dissolved unconsciously, easily produce cataract, leukaemia, angiocardiopathy, brain dysfunction and gynecological disease etc., even can cause the low inferior pathology of human immunity function.

Therefore, various electrical equipment bring convenience simultaneously to us, and electromagnetic radiation is also increasing to the injury that the mankind cause.In time detect electromagnetic radiation intensity, look at whether entail dangers to you and household's health are necessary.

The circuit of hand-held electromagnetic radiation tester all uses common components and parts to make, and cost of manufacture only needs tens yuan, is well suited for being used for factory as instrument and develops in batches.

Below describe hand-held electromagnetic radiation tester of the present invention related relevant technologies content in implementation process in detail.

Summary of the invention

Goal of the invention: should say that now electromagnetic radiation is ubiquitous, for avoiding or reducing the injury that electromagnetic radiation causes human body, for effectively detecting, evade electromagnetic radiation source, the present invention uses common and cheap components and parts, has made a kind of hand-held electromagnetic radiation tester that is easy to popularize.For the design difficulty and the cost of manufacture that reduce electromagnetic radiation tester, circuit is only made qualitative test, does not do the quantitative test of electromagnetic radiation.

Beneficial effect: the invention provides a kind of hand-held electromagnetic radiation tester, is a kind of device that judges the having or not of electrical equipment electromagnetic radiation, qualitative test and point out electromagnetic radiation intensity, testing electromagnetic radiation pollution range.The present invention have circuit structure simple, need not the characteristics such as external power supply, test operation be convenient, can provide foundation for the user evades radiation source, can be used as a kind of electromagnet radiation detection instrument commonly used.

The circuit working principle: hand-held electromagnetic radiation tester electromagnetic induction element used is an electromagnetic induction coil L who is combined into field effect transistor BG1.Field effect transistor BG1 forms the electromagnetic radiation sensor circuit by fixed resistance R1, the potentiometer RP1 of serial connection and electromagnetic induction coil L.When electromagnetic induction coil L senses electromagnetic radiation, after the one-level of field effect transistor BG1 was amplified, the signal that is exaggerated on the drain D pull-up resistor R2 of being on the scene effect pipe BG1 was delivered to NPN transistor BG2 through coupling capacitance C1 and is set up common emitter circuit and carry out the second level and amplify.The amplitude of the signal on NPN transistor BG2 collector depends on the electromagnetic radiation intensity of measured object; If when testing with oscillograph, can obtain waveform at NPN transistor BG2 collector is the above voltage of 100mV.Capacitor C 2 is stopping direct current coupling capacitances, and the signal after it will amplify through NPN transistor BG2 is delivered to PNP transistor BG3 and carried out third level amplification, drives at last LED work.

Technical characterictic: the hand-held electromagnetic radiation tester, it comprises 9V direct supply, electromagnetic induction coil L, one-level amplifying circuit, secondary rc-coupled amplification circuit, three grades of rc-coupled amplification circuits and condition indication circuit, it is characterized in that:

The one-level amplifying circuit: it is comprised of electromagnetic induction coil L, field effect transistor BG1, resistance R 1, potentiometer RP1 and pull-up resistor R2, the two ends of electromagnetic induction coil L connect respectively the grid G of field effect transistor BG1 and the lever arm of potentiometer RP1, the end of potentiometer RP1 is by the anodal VCC of resistance R 1 connection circuit, the other end connection circuit ground GND of potentiometer RP1, the drain D of field effect transistor BG1 connects the end of pull-up resistor R2, the anodal VCC of the other end connection circuit of pull-up resistor R2, the source S connection circuit ground GND of field effect transistor BG1;

The secondary rc-coupled amplification circuit: it is comprised of coupling capacitance C1, NPN transistor BG2, resistance R 3, resistance R 4, the base stage of NPN transistor BG2 is connected with the end of coupling capacitance C1, an end of resistance R 3, the other end of the collector connecting resistance R3 of NPN transistor BG2 and an end of resistance R 4, the anodal VCC of the other end connection circuit of resistance R 4, the emitter connection circuit ground GND of NPN transistor BG2;

Three grades of rc-coupled amplification circuits: it is comprised of coupling capacitance C2, PNP transistor BG3, resistance R 5, potentiometer RP2, resistance R 6 and condition indication circuit, the base stage of PNP transistor BG3 is connected with the lever arm of coupling capacitance C2, potentiometer RP2, the end of potentiometer RP2 is by the anodal VCC of resistance R 5 connection circuits, the other end of potentiometer RP2 is by resistance R 6 connection circuit ground GND, the anodal VCC of the emitter connection circuit of PNP transistor BG3, the collector of PNP transistor BG3 connects condition indication circuit;

The anodal VCC of 9V dc power anode connection circuit, the 9V dc power cathode is connected with circuit ground GND.

Condition indication circuit: it is comprised of resistance R 7 and LED, and the emitter of PNP transistor BG3 is by the positive pole of resistance R 7 sending and receiving optical diode LED, the negative pole connection circuit ground GND of LED.

Description of drawings

Accompanying drawing 1 is the circuit working schematic diagram of hand-held electromagnetic radiation tester; L in figure is for using electromagnetic induction coil.

Embodiment

According to hand-held electric magnetic radiation tester circuit fundamental diagram and the description of drawings shown in accompanying drawing 1, and according to annexation between components and parts in the described each several part circuit of summary of the invention, and the components and parts technical parameter described in embodiment requires and the circuit production main points are implemented to realize the present invention, below in conjunction with embodiment, correlation technique of the present invention is further described.

Components and parts title and important technological parameters

Element number	The components and parts title	Major parameter	Quantity	Remarks
					BG1	D-MOS field effect transistor 2SK422		1
BG2	NPN type 2SC9013	Plastic packaging, β 〉=200	1
					BG3	Positive-negative-positive 2SC9012	Plastic packaging, β 〉=200	1
LED	Super bright red light emitting diodes	LED、￠5	1	Detect indication
					L	Electromagnetic induction coil	￠ 0.8mm enameled wire, 22 circles	1	￠50mm
AN	Pushbutton switch
					RP1	Linear potentiometer	2.2MΩ	1	Be provided with scale
RP2	Linear potentiometer	10KΩ	1	Biasing is set
					R1	Resistance	1/8W?1.5MΩ	1
R2	Resistance	1/8W?10KΩ	1
					R3	Resistance	1/8W?1MΩ	1
R4	Resistance	1/8W?5.6KΩ	1
					R5	Resistance	1/8W?4.7KΩ	1
R6	Resistance	1/8W?100KΩ	1
					R7	Resistance	1/8W?820Ω	1	The step-down current limliting
C1	Electric capacity of the dacron	0.47μF	1	Coupling capacitance
					C2	Electric capacity of the dacron	1μF	1	Coupling capacitance
DC	Direct supply	9V, laminated cell	1

The making of components and parts

Electromagnetic induction coil L: select ￠ 0.8mm enameled wire, around 22 circles, then after the demoulding, prick coiling with plastic adhesive tape on the square circular mould tire of 20mm * 40mm, use at last the epoxide-resin glue sealing;

For strengthening the detection accuracy of electromagnetic radiation tester, reduce peripheral electromagnetic radiation to the interference of electromagnetic radiation tester circuit, PCB circuit board, components and parts and laminated cell must be arranged in a metal shell, and circuit ground should be connected properly with metal shell.

Circuit production main points and circuit debugging

Components and parts and circuit install correct and check complete after, before debugging, with pushbutton switch AN lashup.The base stage of PNP transistor BG3 meets fixed resistance R5, resistance R 6 and potentiometer RP2 and sets up bias voltage.Regulator potentiometer RP2 can make PNP transistor BG3 reach cut-off, thereby the LED in PNP transistor BG3 collector circuit is extinguished.When electromagnetic radiation reached some strength, the negative half-wave of NPN transistor BG2 output signal made PNP transistor BG3 conducting, thereby lights LED.Resistance R 7 is used for operating voltage and the working current of restriction LED;

With tester away from illuminating line or appliance working place far away, as: in outdoor open place, clockwise direction rotational potentiometer RP1, PNP transistor BG3 collector voltage are near 8.3V, till being lit with LED.Positive and negative both direction regulator potentiometer RP2, adjusting should originate in the LED illuminating state, ends at LED and extinguishes state.In case LED extinguishes, potentiometer RP2 is just adjusted complete.When regulator potentiometer RP1, tester should be near (distance several centimetres) radiation source, as: wall-embedded supply socket or the televisor of working etc., radiation device is arranged;

3. in the counterclockwise direction in the situation of rotational potentiometer RP1, when being transferred to a certain ad-hoc location, electromagnetic radiation tester is near radiation source, and LED just easily is lit, first tester is moved closer to radiation source, move on to LED always and begin luminous position; Again electromagnetic radiation tester is progressively removed, moved on to LED always and no longer continue luminous position.If field effect transistor BG1 continues conducting, show that potentiometer RP1 does not also mix up, adjustment potentiometer RP1 need carry out repeatedly could regulating putting in place repeatedly.

Claims

1. hand-held electromagnetic radiation tester, it comprises 9V direct supply, electromagnetic induction coil L, one-level amplifying circuit, secondary rc-coupled amplification circuit, three grades of rc-coupled amplification circuits and condition indication circuit, it is characterized in that:

Described one-level amplifying circuit is comprised of electromagnetic induction coil L, field effect transistor BG1, resistance R 1, potentiometer RP1 and pull-up resistor R2, the two ends of electromagnetic induction coil L connect respectively the grid G of field effect transistor BG1 and the lever arm of potentiometer RP1, the end of potentiometer RP1 is by the anodal VCC of resistance R 1 connection circuit, the other end connection circuit ground GND of potentiometer RP1, the drain D of field effect transistor BG1 connects the end of pull-up resistor R2, the anodal VCC of the other end connection circuit of pull-up resistor R2, the source S connection circuit ground GND of field effect transistor BG1;

Described secondary rc-coupled amplification circuit is comprised of coupling capacitance C1, NPN transistor BG2, resistance R 3, resistance R 4, the base stage of NPN transistor BG2 is connected with the end of coupling capacitance C1, an end of resistance R 3, the other end of the collector connecting resistance R3 of NPN transistor BG2 and an end of resistance R 4, the anodal VCC of the other end connection circuit of resistance R 4, the emitter connection circuit ground GND of NPN transistor BG2;

Described three grades of rc-coupled amplification circuits are comprised of coupling capacitance C2, PNP transistor BG3, resistance R 5, potentiometer RP2, resistance R 6 and condition indication circuit, the base stage of PNP transistor BG3 is connected with the lever arm of coupling capacitance C2, potentiometer RP2, the end of potentiometer RP2 is by the anodal VCC of resistance R 5 connection circuits, the other end of potentiometer RP2 is by resistance R 6 connection circuit ground GND, the anodal VCC of the emitter connection circuit of PNP transistor BG3, the collector of PNP transistor BG3 connects condition indication circuit;

The anodal VCC of described 9V dc power anode connection circuit, the 9V dc power cathode is connected with circuit ground GND.

2. hand-held electromagnetic radiation tester according to claim 1, it is characterized in that: condition indication circuit is comprised of resistance R 7 and LED, the emitter of PNP transistor BG3 is by the positive pole of resistance R 7 sending and receiving optical diode LED, the negative pole connection circuit ground GND of LED.