CN202330570U

CN202330570U - Detection device of electromagnetic field strength

Info

Publication number: CN202330570U
Application number: CN2011204825908U
Authority: CN
Inventors: 赖石珠; 朱耀华
Original assignee: Shaoguan No2 High Grade Technical School Practice Factory
Current assignee: Shaoguan No2 High Grade Technical School Practice Factory
Priority date: 2011-11-28
Filing date: 2011-11-28
Publication date: 2012-07-11
Anticipated expiration: 2021-11-28

Abstract

The utility model discloses a detection device of electromagnetic field strength, which comprises a signal detection circuit, an amplifying circuit, a display device and a power module. The signal detection circuit is used for converting electromagnetic waves in a space into electrical signals, the amplifying circuit is used for receiving the electrical signals of the signal detection circuit and amplifying the electrical signals, the display device is connected with the amplifying circuit and used for displaying strength of the electrical signals, and the power module is connected with the signal detection circuit, the amplifying circuit and the display device, and used for supplying power to the signal detection circuit, the amplifying circuit and the display device. Compared with the prior art, the detection device is simple in structure, general in element, easy in element selection and high in measuring sensitivity and reliability.

Description

The electromagnetic intensity pick-up unit

Technical field

The utility model relates to a kind of device of signal intensity, especially a kind of pick-up unit of electromagnetic intensity.

Background technology

In modern times in the live and work environment; The electromagnetic field that widespread use produced (EMF3) of electricity and electric equipment is more and more serious to the influence of human body; When electromagnetic radiation surpasses certain intensity, will form electromagnetic pollution during like 2 milligauss, can cause people's headache, insomnia, amnesia and angiocardiopathy; When serious even can bring out cancer, make children's cases with leukemia.Calendar year 2001, IARC confirmed as the doubtful carcinogenic factor to the people with magnetic field, and when magnetic field intensity surpassed 0.4PT (4 milligauss) in the proposition living environment, the leukemic incidence of children obviously increased.The Chinese Consumers' Association in August 6 calendar year 2001 No. 9 warning of consumption of cloth, daily life must anti-electromagnetic radiation.

The device of existing detection electromagnetism intensity all is special equipment; Like high performance spectrum analyzer etc., these equipment volume are excessive, cost an arm and a leg, and are not suitable for the general population and conveniently carry use; Therefore, people can't in time discover unhealthful electromagnetic wave at one's side in time to hide.

The utility model content

To the deficiency of prior art, the purpose of the utility model is that a kind of electromagnetic intensity pick-up unit simple in structure, with low cost, portable will be provided.

For realizing above-mentioned purpose, the technical scheme that the utility model adopts is following:

A kind of electromagnetic intensity pick-up unit, said pick-up unit comprises:

Signal deteching circuit is used for producing according to the electromagnetic intensity in space the electric signal of corresponding loudness; With

Amplifying circuit receives the electric signal of said signal deteching circuit, and electric signal is amplified; With

Display device is connected with said amplifying circuit, is used to show the intensity of electric signal; And,

Power module is connected with said signal deteching circuit, amplifying circuit and display device, is used for to said signal deteching circuit, amplifying circuit and display device power supply.

Further, said signal deteching circuit is through electric capacity and the coupling of said amplifying circuit.

Preferably, said signal deteching circuit is the relay iron core that an outer felt is wound with coil, and said coil diameter is 0.05mm, and direct current resistance is 700 ohm.

Further, said amplifying circuit comprises interchange amplification module and the said direct current amplification module that exchanges amplification module of at least one reception.

Concrete; First AC amplifier that said interchange amplification module is connected in series each other, second AC amplifier and the 3rd AC amplifier; Said first AC amplifier receives said signal deteching circuit signal, and said the 3rd AC amplifier is connected with said direct current amplification module.

Further, the reverse input end of said first AC amplifier also is serially connected with a rheostat.

Preferably, also comprise a secondary amplifying circuit, said secondary amplifying circuit comprises a triode, and said transistor base is connected with said power module through a resistance, and collector is connected with the said second AC amplifier reverse input end with resistance through an electric capacity.

Concrete, said display device comprises indicator gauge and the sound-producing device that receives said amplifying circuit output signal respectively.

More specifically, said sound-producing device comprises a phase-locked loop circuit and piezoelectric buzzer, and said phase-locked loop circuit receives the output signal of said amplifying circuit, and drives said piezoelectric buzzer sounding.

Further; Said power module comprises a power switch, delay unit and a mu balanced circuit; Said power switch is connected with said delay unit with said secondary amplifying circuit respectively; Said delay unit is controlled the output of said mu balanced circuit, supplies power to said signal deteching circuit, amplifying circuit and display device through said mu balanced circuit.

With respect to prior art, the described electromagnetic intensity pick-up unit of the utility model is simple in structure, the general easy choosing of element, measure sensitivity and reliability is high, can obtain good economic benefit and social benefit.

For purpose, characteristic and the effect of understanding the utility model fully, below will combine accompanying drawing that the technique effect of design, concrete structure and the generation of the utility model is described further.

Description of drawings

Fig. 1 is the structural drawing of the described electromagnetism intensity pick-up unit of the utility model;

Fig. 2 is the circuit theory diagrams of a kind of embodiment of the utility model.

Among the figure:

The 1-signal deteching circuit; The 2-amplifying circuit; The 3-display device; The 4-power module.

Embodiment

Like Fig. 1, shown in Figure 2; A kind of electromagnetism intensity pick-up unit comprises signal deteching circuit 1, receives the amplifying circuit 2 of signal deteching circuit 1 signal; The display device 3 that amplifying signal is shown, and the power module 4 of giving the power supply of electromagnetism intensity pick-up unit each several part.

Signal deteching circuit 1 is used for detecting the electromagnetic wave in space, and produces the electric current or the voltage signal of corresponding size according to electromagnetic intensity induction.As preferred embodiment a kind of, see also Fig. 2, signal deteching circuit 1 can adopt line directly for 0.05mm, direct current resistance are that 700 ohm coil is wrapped in the miniature relay core assembly, inserts in the amplifying circuit 2 through capacity coupled mode.That this kind mode has is highly sensitive, area detection signal is wide, satisfies the needs that general electromagnetic wave signal detects, and especially the electromagnetic signal to 50Hz/60Hz detects the most reliable and the most stable.

Signal amplification circuit 2 is used for the signal of sensing of signal deteching circuit 1 is amplified.See also Fig. 1, as preferred embodiment a kind of, signal amplification circuit 2 comprises interchange amplification module and direct current amplification module, exchanges amplification module and comprises the first AC amplifier A1, the second AC amplifier A2 and the 3rd AC amplifier A3.The first AC amplifier A1 receives the signal of

signal deteching circuit

1,5～10 times of enlargement factors.Be in for the range that guarantees measuring-signal in the indication range of back flat-panel display device 3, the small-sized potentiometer W1 that is serially connected with a 100K at the reverse input end of first AC amplifier regulates the sensitivity of input signal.The enlargement factor of the second AC amplifier A2 is 5 times, and its reverse input end also is serially connected with a secondary amplifying circuit.Said secondary amplifying circuit comprises a triode VT1, the grounded emitter of triode VT1, and collector is connected with the reverse input end of resistance R 5 with the second AC amplifier A2 through capacitor C 3, and base stage is connected with power module through resistance R 9.Behind circuit start, press power switch again; The collector and emitter saturation conduction of triode VT1; This grade signal amplifying power strengthens, and pick-up unit gets into the secondary magnifying state, and detection sensitivity is 10 times of previous status; Detectability to little magnetic field greatly strengthens, and this function is usually used in the electromagnetic field background of measured zone is measured.

Signal after the second AC amplifier A2 amplifies utilizes diode VD1 to carry out the negative sense half-wave rectification after the 3rd AC amplifier A3 further amplifies, and the AC signal that the 3rd AC amplifier A3 is exported is rectified into direct current signal.Direct current signal is sent into direct current amplification module B1 and is carried out the direct current amplification after the A4 buffering, the electromagnetic signal after the amplification is delivered to display device, shows through the power of display device with electromagnetic field.

Display device 3 is connected with amplifying circuit 2, is used for signal intensity is shown.In order to improve the display capabilities of display device 3, can adopt an indicator gauge and a sound-producing device.Reometer can adopt the magnetoelectricity series microampere meter of 250uA, and scale is from 0～10mG, and wherein, 0～2mG segment mark is with green, and 2～8mG segment mark is designated as redness with yellow more than the 8mG, representes that respectively electromagnetic field can be accepted, allow in short-term and dangerous situation among the human settlement.Sound-producing device comprises by phase-locked loop circuit M4046 forms voltage-frequency converting circuit and piezoelectricity singing piece is formed.See also Fig. 2, the simulating signal of direct current amplification module B1 output is delivered to 9 pin of phase-locked loop circuit M4046 through R20, and the digital pulse signal after the conversion is exported from 4 pin.When input voltage changes, will cause the variation of output pulse signal frequency, the sound that piezoelectricity singing piece is sent changes with detected electromagnetic field signal power.When electromagnetic field inducing intensity is 2mG, send the clatter-clatter sound that is interrupted, break time, speed can be regulated by resistance R 21, when magnetic induction intensity is higher than 10mG, sent continuous whistle prompting warning.

Power module 4 comprises a power switch SB, delay unit and a mu balanced circuit; Power switch is connected with said delay unit with said secondary amplifying circuit respectively; Said delay unit is controlled the output of said mu balanced circuit, supplies power to said signal deteching circuit, amplifying circuit and display device through said mu balanced circuit.As preferred embodiment a kind of, the series regulator that power module 4 can adopt the 9V laminated cell and constitute with LM324 integrated transporting discharging B2, voltage stabilizing output 5.5V guarantees the order of accuarcy of measuring.Delay unit comprises a comparer B3, resistance R 26 and capacitor C 10, causes and end the purpose that reaches time-delay through control stabilized voltage supply adjustment circuit VT4.When the moment of pressing SB, battery charges to C10, and comparer B3 voltage has output, the stabilized voltage supply operate as normal, and when C10 discharge end, comparer stops output, and VT4 is by the purpose that reaches the time-delay automatically cutting off power source.Wherein the delay time of delay unit is by discharge resistance R26 decision, and when R26 was 1M Ω, when the C10 capacity was 100uF, delay time was 5 minutes.

During use; Through the electromagnetic intensity in signal deteching circuit 1 space exploration; And according to electromagnetic intensity generation induction current or voltage signal, the electric signal of generation shows in indicator gauge after the amplification of amplifying circuit 2 and representes corresponding electromagnetic intensity through the speed of sound.

With respect to prior art, the described electromagnetic intensity pick-up unit of the utility model is simple in structure, the general easy choosing of element, measure sensitivity and reliability is high.This product is practical in theory, the circuit design Nover practical, and obtain significant results.Product exports western developed countries such as the U.S., Japan, Europe in a large number, obtains good economic benefit and social benefit.

More than describe the preferred embodiment of the utility model in detail, the ordinary skill that should be appreciated that this area need not creative work and just can make many modifications and variation according to the design of the utility model.Therefore, all technician in the art according to the utility model design on the prior art basis through logic analysis, reasoning perhaps according to the available technical scheme of limited experiment, all should be among determined protection domain by these claims.

Claims

1. an electromagnetic intensity pick-up unit is characterized in that, said pick-up unit comprises:

Signal deteching circuit is used for converting to according to the electromagnetic intensity in space the electric signal of respective strengths; With

2. pick-up unit as claimed in claim 1 is characterized in that, said signal deteching circuit is through electric capacity and the coupling of said amplifying circuit.

3. pick-up unit as claimed in claim 2 is characterized in that, said signal deteching circuit is the relay iron core that an outer felt is wound with coil, and said coil diameter is 0.05mm, and direct current resistance is 700 ohm.

4. pick-up unit as claimed in claim 3 is characterized in that, said amplifying circuit comprises interchange amplification module and the said direct current amplification module that exchanges amplification module of at least one reception.

5. pick-up unit as claimed in claim 4; It is characterized in that; Said interchange amplification module comprises first AC amplifier, second AC amplifier and the 3rd AC amplifier of mutual serial connection; Said first AC amplifier receives said signal deteching circuit signal, and said the 3rd AC amplifier is connected with said direct current amplification module.

6. pick-up unit as claimed in claim 5 is characterized in that the reverse input end of said first AC amplifier also is serially connected with a rheostat.

7. like claim 5 or 6 described pick-up units; It is characterized in that; Also comprise a secondary amplifying circuit; Said secondary amplifying circuit comprises a triode, and said transistor base is connected with said power module through a resistance, and collector is connected with the said second AC amplifier reverse input end with resistance through an electric capacity.

8. pick-up unit as claimed in claim 7 is characterized in that, said display device comprises indicator gauge and the sound-producing device that receives said amplifying circuit output signal respectively.

9. pick-up unit as claimed in claim 8 is characterized in that said sound-producing device comprises a phase-locked loop circuit and piezoelectric buzzer, and said phase-locked loop circuit receives the output signal of said amplifying circuit, and drives said piezoelectric buzzer sounding.

10. pick-up unit as claimed in claim 9; It is characterized in that; Said power module comprises a power switch, delay unit and a mu balanced circuit; Said power switch is connected with said delay unit with said secondary amplifying circuit respectively, and said delay unit is controlled the output of said mu balanced circuit, supplies power to said signal deteching circuit, amplifying circuit and display device through said mu balanced circuit.