CN2807276Y

CN2807276Y - Detecting control circuit used for detector

Info

Publication number: CN2807276Y
Application number: CN 200520043371
Authority: CN
Inventors: 戴明远
Original assignee: SHANGHAI KAIGE ELECTRONICS CO
Current assignee: SHANGHAI KAIGE ELECTRONICS CO
Priority date: 2005-07-13
Filing date: 2005-07-13
Publication date: 2006-08-16
Anticipated expiration: 2015-07-13

Abstract

The utility model relates to a detecting control circuit used for a detector, which comprises a microprocessor, a display and sound device and a control circuit thereof which detects measured objects, wherein the control circuit which detects the measured objects comprises a detecting signal processing circuit, a sensor and a rectifying filter circuit which are orderly connected with each other; the detecting signal processing circuit is connected with the output end of the microprocessor; the rectifying filter circuit is connected with the input end of the microprocessor. The microprocessor emits a pulse-width modulation signal which goes past the control circuit to the microprocessor, and a stable voltage signal within a setting range is obtained; after the microprocessor makes the measured objects close to sensing signals and the reference value to carry out operation and processing with the reference value, the display and sound device carries out grading display and emits the sounds. The utility model provides the detecting control circuit used for a detector which has the advantages of high sensitivity and stable operation.

Description

A kind of detection control circuit that is used for detector

Technical field

The utility model relates to a kind of detector that is used to survey the measured object (as: metal object) of burying in the body of wall, especially refers to be used for the detection control circuit of detector.

Background technology

The existing detector that is used to survey the metal object of burying in the body of wall, its detection control circuit, as shown in Figure 1, its principle of work is:

When visiting metallic circuit work, by LC self-sustained oscillation loop 3 ' perception metal approach signal, by filter circuit 4 ' filtering relatively after after AD conversion loop 5 ' processings feed signals to signal processing circuit 1 ' processing; And in the school zero the time by signal processing circuit 1 ' output signal to zero control circuit 2 ' control LC self-sustained oscillation loop 3 ' reach zero.

On above-mentioned, LC self-sustained oscillation loop 3 ' be operated in passive states, jitter; Compare filter circuit 4 ' middle diode that is operated in passive states that used, temperature influence is big; The AD conversion loop 5 ' measurement of voltage is transformed for the measurement to the time requires microprocessor time difference method height.In a word, it is low that this circuit is surveyed the sensitivity of metal, job insecurity.

The utility model content

It is a kind of highly sensitive that the purpose of this utility model is to provide, the detection control circuit that is used for detector of working stability.

A kind of detection control circuit that is used for detector provided by the utility model, comprise microprocessor, the control loop of demonstration and sound device and detection measured object thereof, it is characterized in that: the control loop of described detection measured object comprises the detectable signal treatment circuit that links to each other successively, sensor and current rectifying and wave filtering circuit, described detectable signal treatment circuit links to each other with the output terminal of described microprocessor, described current rectifying and wave filtering circuit links to each other with the input end of described microprocessor, send a pulse-width signal by microprocessor, obtain a voltage signal stable in setting range through this control loop to microprocessor, and measured object is carried out computing near transducing signal and this reference value by microprocessor, after the processing, carry out classification display and send the sound for demonstration and sound device.

The detection control circuit of above-mentioned detector, wherein, sensor is for surveying the oscillatory type sensor of metal object.

The detection control circuit of above-mentioned detector, wherein, the oscillatory type sensor is based on transistorized waveform generator.

The detection control circuit of above-mentioned detector, wherein, microprocessor adopts the microprocessor of band A/D conversion of signals.

The detection control circuit of above-mentioned detector, wherein, demonstration and sound device are classification display and sound device, that is: this detector can be made classification display and send the sound according to the distance that is detected between thing and the detector.

Adopted above-mentioned technical solution, that is: microprocessor removes to control the detectable signal treatment circuit by pulse-width signal of output port output, its input port obtains a voltage relevant with signal, when initialization, this voltage is adjusted to a fixed value automatically, the benchmark during as later the measurement.During measurement, input port obtained and magnitude of voltage that signal is relevant and reference value obtain relation between measured object and the detector by computing, by showing that output port drives display device and makes classification display, and can drive loudspeaker as required and send the sound.Characteristics of the present utility model are: the first, use the microprocessor of being with A/D, and realized the digitized processing signal, simultaneously, make result of detection more accurate, improved sensitivity; The second, owing to adopted dynamic instrumentation control, obtain metastable reference voltage signal input, make that working stability has improved sensitivity simultaneously than zero wider range; The 3rd, visit the active transistor oscillatory type sensor that metal has partly adopted amplitude stabilization, cooperate and survey control signal, constitute feedback control loop, enlarged working range, improved the stability and the sensitivity of sensor; The 4th, adopt current rectifying and wave filtering circuit that sensor signal is become the voltage of different amplitudes, make visual result, microprocessor distinguishes that the ability of voltage is strong simultaneously, improves precision.

Description of drawings

Fig. 1 is the detection control circuit schematic diagram of existing detector;

Fig. 2 is the circuit block diagram of the embodiment of the utility model scheme;

Fig. 3 is the circuit theory diagrams of the embodiment of the utility model scheme.

Embodiment

Shown in Fig. 2～3, the utility model is used for the detection control circuit of detector, comprise the control loop of microprocessor 1, demonstration and sound device 2 and detection measured object thereof, the control loop of surveying measured object comprises detectable signal treatment circuit 3, active transistor oscillatory type sensor 4 and the current rectifying and wave filtering circuit 5 that links to each other successively.

Detectable signal treatment circuit 3 links to each other with the output terminal of microprocessor 1, and current rectifying and wave filtering circuit 5 links to each other with the input end of microprocessor 1.

Microprocessor 1 sends one and surveys control signal, give 4 one stable base voltages of active transistor oscillatory type sensor by detectable signal treatment circuit 3, in active transistor oscillatory type sensor 4, produce the signal of an amplitude stability, obtain a stable magnitude of voltage by current rectifying and wave filtering circuit 5.When zero, this magnitude of voltage is delivered in the microprocessor 1 and is kept, as the school null value.As metal object when the sensor, the oscillation amplitude that active transistor oscillatory type sensor 4 produces can reduce, behind current rectifying and wave filtering circuit 5, this voltage signal can change near degree with metal object, after by microprocessor 1 this signal and school null value being carried out computing, handled, for showing and sound device 2 is made classification or non-classification display and sent the sound.Classification display and sound device are for making classification display and send the sound according to the distance that is detected the distance between thing and the detector.

As shown in Figure 3, microprocessor 1 comprises that common model is chip, capacitor C 9, C10, resistance R 9 and the crystal oscillator Y1 of HT46R47, this microprocessor 1 is powered by power supply, whether this power supply can be linked to each other with dry cell BT1 by button SW1 control and power, and by model be the integrated circuit (IC) chip U1 of 78L05 cell voltage is stabilized to+5V uses for total system, removes power supply ripple by capacitor C 2, C15 simultaneously.

Show and sound device 2 is by LED 1～4, resistance R 11, R14, R17, R20, and loudspeaker SP1, resistance R 21, R22, R23, R24, R30, triode Q2, Q3 form.

Detectable signal treatment circuit 3 is made up of common circuit component, comprises resistance R 3, R5, R1, R6, R7, R2, R8, capacitor C 5, C6, C1, C7, operational amplifier U3A.

Active transistor oscillatory type sensor 4 is made up of common circuit component, comprises transformer T1, transistor Q1, capacitor C 3, C4, C8, resistance R 4, R10.

Current rectifying and wave filtering circuit 5 is made up of common circuit component, comprises resistance R 15, R12, R18, R16, R13, R19, R27, R29, R25, R26, R28, capacitor C 11, C14, operational amplifier U3B, U4A, U4B, diode D1, D2.

Above embodiment is only for the usefulness that the utility model is described, but not to restriction of the present utility model, person skilled in the relevant technique, under the situation that does not break away from spirit and scope of the present utility model, can also make various conversion or variation, therefore all technical schemes that are equal to also should belong within the category of the present utility model, and are limited by each claim.

Claims

1. detection control circuit that is used for detector, comprise microprocessor, the control loop of demonstration and sound device and detection measured object thereof, it is characterized in that: the control loop of described detection measured object comprises the detectable signal treatment circuit that links to each other successively, sensor and current rectifying and wave filtering circuit, described detectable signal treatment circuit links to each other with the output terminal of described microprocessor, described current rectifying and wave filtering circuit links to each other with the input end of described microprocessor, send a pulse-width signal by microprocessor, obtain a voltage signal stable in setting range through this control loop to microprocessor, and measured object is carried out computing near transducing signal and this reference value by microprocessor, after the processing, carry out classification display and send the sound for demonstration and sound device.

2. the detection control circuit that is used for detector according to claim 1 is characterized in that, described sensor is for surveying the oscillatory type sensor of metal object.

3. the detection control circuit that is used for detector according to claim 2 is characterized in that, described oscillatory type sensor is based on transistorized waveform generator.

4. the detection control circuit that is used for detector according to claim 1 is characterized in that, described microprocessor adopts the microprocessor of band A/D conversion of signals.

5. the detection control circuit that is used for detector according to claim 1, it is characterized in that, described demonstration and sound device are classification display and sound device, that is: this detector can be made classification display and send the sound according to the distance that is detected between thing and the detector.