CN103197352A - Multifunctional wall body detecting instrument - Google Patents

Abstract

The invention relates to the field of building structure detection, and more particularly to a wall detector. The invention includes five parts: the first part is a water pipe detection circuit, which is composed of a capacitive sensor for measuring water pipes, a monostable trigger circuit, and an average value circuit; The amplifier circuit and the impedance transformation circuit are composed in series; the third part is the metal detection circuit, which is composed of the transmitting winding, the current resonance circuit, the differential receiving coil, the amplifier circuit, the filter circuit and the bias circuit in series; the fourth part is the auxiliary circuit, It is composed of an infrared transmitter and an infrared receiver in series; the fifth part is a control circuit, including a controller; the first part, the second part, the third part and the fourth part are all independent from the fifth part connect. The multifunctional wall detector of the invention has the advantages of compact size, low manufacturing cost, simple manufacturing process and good manufacturing repeatability.

Description

A multifunctional wall detector

technical field

The invention relates to the field of building structure detection, and more particularly to a wall detector.

the

Background technique

During the home decoration inspection, the water pipes, wires, and metal reinforcement in the wall often have a certain impact on the construction, and even cause accidents, resulting in personnel and property losses. If the detection can be carried out before construction to find out the arrangement of water pipes, electric wires and metal reinforcement in the wall, the occurrence of relevant accident losses can be effectively prevented.

In the current field of industrial control, there are sensors specially for objects such as metals and wires. For example, in the current industrial control field, in order to detect defects of metal parts, eddy current sensors are often used, and the eddy current sensors have good resolution and linearity. However, in the field of construction, the focus is on the detection range of metal detection. Therefore, this type of sensor is not suitable for wall detection in the decoration inspection industry. Including the detection of two other objects: the detection of wires and water pipes, there are special sensors on the market, but the cost is high, and the size and accuracy indicators are also lacking.

Therefore, there is an urgent need in the market for a multifunctional wall detector with compact size, low manufacturing cost, simple manufacturing process, and good manufacturing repeatability.

the

Contents of the invention

The purpose of the present invention is to overcome the disadvantages of the prior art and provide a multifunctional wall detector with compact size, low manufacturing cost, simple manufacturing process and good manufacturing repeatability.

The specific technical solution adopted in the present invention is: a multifunctional wall detector, comprising five parts:

The first part is the water pipe detection circuit, which is composed of a capacitive sensor for measuring water pipes, a monostable trigger circuit, and an average value circuit in series;

The second part is the wire detection circuit, which is composed of a copper clad wire for the detection wire, a high-impedance amplifier circuit, and an impedance conversion circuit in series;

The third part is the metal detection circuit, which is composed of a transmitting winding, a current resonance circuit, a differential receiving coil, an amplifier circuit, a filter circuit, and a bias circuit in series;

The fourth part is the auxiliary circuit, which consists of an infrared transmitter and an infrared receiver connected in series;

The fifth part is the control circuit, including the controller;

The first part, the second part, the third part and the fourth part are all independently connected to the fifth part.

Preferably, the multifunctional wall detector further includes a main body PCB, the capacitive sensor for the water measuring pipe, the copper clad for the probe wire, and the differential receiving coil are integrated on the main body PCB superior.

Preferably, the controller includes a water pipe detection control module, a circuit detection control module, and a metal detection control module; the water pipe detection control module, the circuit detection control module, and the metal detection control module are integrated in the controller; The first part of the water pipe detection circuit is connected in parallel with the fourth part of the auxiliary circuit and then connected to the water pipe detection control module; the second part of the wire detection circuit is connected to the circuit detection control module; The third part of the metal detection circuit is connected with the metal detection control module.

Preferably, the main body PCB board includes two sides of a back board and a top board, the first part of the water pipe detection circuit and the second part of the wire detection circuit are integrated on the back board, and the third part The metal detection circuit is integrated on the top board.

As a preference, the capacitive sensor for measuring water pipes includes a first pole plate, a second pole plate, and a third pole plate, and the first pole plate, the second pole plate, and the third pole plate together form a capacitance, and the The second pole plate is used as the main pole of the capacitor, and the first pole plate and the second pole plate are connected in series to form the secondary pole of the capacitor.

Preferably, the differential receiving coil includes a first receiving coil, a second receiving coil, a third receiving coil, a fourth receiving coil and a trimming coil, the first receiving coil, the second receiving coil, the third receiving coil , the fourth receiving coil in series, the fine-tuning coil is connected in series between the third receiving coil and the fourth receiving coil, the first receiving coil, the third receiving coil, and the fourth receiving coil are located at On the top board, the second receiving coil is located on the back board.

Preferably, the copper-clad copper for probe wires includes a first copper-clad laminate, a second copper-clad laminate, and a third copper-clad laminate, and the horizontal centerlines of the first copper-clad laminate, the second copper-clad laminate, and the third copper-clad laminate are aligned and the like distances are arranged on the backplane.

Preferably, the first part of the water pipe detection circuit further includes a first reference voltage supply unit, a second reference voltage supply unit, a power supply, and a narrowband pulse generation circuit, and the narrowband pulse generation circuit is connected in series with the monostable The trigger circuit is located between the average value circuits, and the power supply supplies power to the first reference voltage supply unit, the second reference voltage supply unit, the narrowband pulse generation circuit and the average value circuit respectively.

Preferably, the second part of the wire detection circuit further includes a bias voltage supply unit, and the bias voltage supply unit supplies power to the high-impedance amplifier circuit and the impedance transformation circuit.

Preferably, the emitting winding is a self-wound coil, including a common enameled wire and a skeleton, and the common enameled wire is evenly wound on the skeleton.

Compared with the prior art, the multifunctional wall detector of the present invention has the advantages of compact size, low manufacturing cost, simple manufacturing process and good manufacturing repeatability.

the

Description of drawings

Fig. 1: The circuit block diagram of multifunctional wall detector of the present invention.

Fig. 2: a layout diagram of the three sensors of the multifunctional wall detector of the present invention.

Fig. 3: The circuit block diagram of the multifunctional wall detector of the present invention for measuring the capacitance value of the capacitor plate.

Fig. 4: The schematic circuit diagram of the multifunctional wall detector of the present invention for measuring the capacitance value of the capacitor plate.

Figure 5: Schematic diagram of the auxiliary circuit for the multifunctional wall detector of the present invention for wall detection.

Fig. 6: A block diagram of a high-impedance amplifying circuit for signal processing of the multifunctional wall detector of the present invention.

Fig. 7: Schematic diagram of the high-impedance amplifying circuit used for signal processing in the multifunctional wall detector of the present invention.

Fig. 8: Schematic diagram of the transmitting coil winding of the multifunctional wall detector of the present invention.

Fig. 9: Schematic diagram of the current resonance circuit of the multifunctional wall detector of the present invention.

Fig. 10: An exploded schematic diagram of the differential receiving coil of the multifunctional wall detector of the present invention.

Fig. 11: A block diagram of the differential receiving coil output signal processing circuit of the multifunctional wall detector of the present invention.

Fig. 12: Schematic diagram of the differential receiving coil output signal processing circuit of the multifunctional wall detector of the present invention.

Fig. 13: Flow chart of the water pipe detection program of the multifunctional wall detector of the present invention.

Fig. 14: Flowchart of the electric wire detection program of the multifunctional wall detector of the present invention.

Fig. 15: Flow chart of the metal detection program of the multifunctional wall detector of the present invention.

the

Detailed ways

The technical solution will be further described below with reference to the accompanying drawings, but the description is only for explaining the present invention, and should not be construed as limiting the present invention.

Please see Fig. 1-Fig. 12, a kind of multifunctional wall body detector of the present invention, comprises five parts: the first part is the water pipe detection circuit, is made of capacitive sensor 300 for measuring water pipe, monostable trigger circuit 304, average value circuit 307 The second part is a wire detection circuit, which is composed of a copper-clad 14 for detection wires, a high-impedance amplifier circuit 701, and an impedance conversion circuit 703 in series; the third part is a metal detection circuit, which is composed of a transmitting winding 100, a current resonance circuit 110. The differential receiving coil 9, the amplifier circuit 393, the filter circuit 394, and the bias circuit 395 are sequentially connected in series; the fourth part is an auxiliary circuit, which is composed of an infrared transmitter 52 and an infrared receiver 53 in series; the fifth part is a control circuit , including a controller 400; the first part, the second part, the third part, and the fourth part are all independently connected to the fifth part; the controller 400 includes a water pipe detection control module, a circuit detection control module, and a metal detection control module; water pipe detection The control module, circuit detection control module, and metal detection control module are integrated in the controller 400; the first part of the water pipe detection circuit is connected in parallel with the fourth part of the auxiliary circuit and then connected to the water pipe detection control module; the second part of the wire detection circuit and the circuit detection control module connection; the third part of the metal detection circuit is connected with the metal detection control module.

A multifunctional wall detector of the present invention also includes a main body PCB 1 , a capacitive sensor 4 for measuring water pipes, a copper clad 14 for detection wires, and a differential receiving coil 9 integrated on the main body PCB 1 . The main body PCB 1 includes two sides of the back board 2 and the top board 3 , the first part of the water pipe detection circuit and the second part of the wire detection circuit are integrated on the back board 2 , and the third part of the metal detection circuit is integrated on the top board 3 .

Capacitance sensor 4 for water measuring pipe comprises first pole plate 4, second pole plate 5, third pole plate 6, first pole plate 4, second pole plate 5, third pole plate 6 constitute capacitor 301 together, second pole plate The plate 5 serves as the main pole of the capacitor 301 , and the first pole plate 4 and the second pole plate 6 are connected in series to form the secondary pole of the capacitor 301 .

The differential receiving coil 9 includes a first receiving coil 8, a second receiving coil 9, a third receiving coil 10, a fourth receiving coil 11 and a trimming coil 12, the first receiving coil 8, the second receiving coil 9, the third receiving coil 10 , the fourth receiving coil 11 is connected in series, the trimming coil 12 is connected in series between the third receiving coil 10 and the fourth receiving coil 11, the first receiving coil 8, the third receiving coil 10, and the fourth receiving coil 11 are located on the top plate 3 surface, The second receiving coil 9 is located on the surface of the backplane 2 .

The copper-clad laminate 14 for the probe wire includes a first copper-clad laminate 13, a second copper-clad laminate 14, and a third copper-clad laminate 15, and the first copper-clad laminate 13, the second copper-clad laminate 14, and the third copper-clad laminate 15 are aligned and equidistantly arranged on the horizontal centerline on the backplane 2 side.

The first part of the water pipe detection circuit also includes a first reference voltage supply unit 302, a second reference voltage supply unit 303, a power supply 305, and a narrowband pulse generation circuit 306. The narrowband pulse generation circuit 306 is connected in series with the monostable trigger circuit 304 and the averaging circuit 307. In between, the power supply 305 supplies power to the first reference voltage supply unit 302 , the second reference voltage supply unit 303 , the narrowband pulse generation circuit 306 and the averaging circuit 307 respectively.

The second part of the electric wire detection circuit also includes a bias voltage supply unit 702 , and the bias voltage supply unit 702 supplies power to the high impedance amplifier circuit 701 and the impedance conversion circuit 703 .

The transmitting winding 100 is a self-winding coil, including a common enameled wire 101 and a skeleton 106 , and the common enameled wire 101 is evenly wound on the skeleton 106 .

The implementation process of the water pipe detection function of a multifunctional wall detector of the present invention will be described in detail below in conjunction with the accompanying drawings.

For the design of this part, please refer to Figure 2, Figure 3, Figure 4 and Figure 5. Figure 2 includes a schematic diagram of the capacitor plate, and Figures 3 and 4 are the capacitance value measurement circuit of the capacitor plate. The measurement circuit is divided into a first reference voltage supply unit 302 , a second reference voltage supply unit 303 , a monostable trigger circuit 304 , a narrowband pulse generation circuit 306 and an average value circuit 307 . All circuit units are powered by the power supply 305 .

The second pole plate 5 is the main pole of the capacitor, and the first pole plate 4 and the third plate 6 are connected in series to form the secondary side of the capacitor. The main capacitor plate and the secondary capacitor plate are respectively connected to the multivibrator 20 . The multivibrator model is HC4538, which includes two independent multivibrators inside. The main and secondary capacitor plates and the thirty-seventh resistor 37 and the thirty-eighth resistor 38 form an RC circuit. The thirtieth resistor 30 and the thirty-first resistor 31 divide the voltage to obtain the RC limit voltage of the main capacitor plate. The thirty-fourth resistor 34 and the thirty-fifth resistor 35 divide the voltage to form the RC limit voltage of the secondary capacitor plate. The time constant of the two RC circuits determines the duty cycle of the oscillator output pulse, so measuring the duty cycle of the output pulse can obtain the capacitance value of the capacitor plate. In addition, the controller has a built-in DAC module 36, which can adjust the limit voltage on the plate of the secondary capacitor. In order to measure the change of the plate capacitance, two independent output terminals are connected to the NOR gate circuit 21 to obtain a narrow-band pulse signal reflecting the capacitance. In order to ensure the detection range of the instrument, the controller needs to adjust the circuit to work in a working state, and the twenty-third triode 23 cannot be in a saturated or cut-off state. The controller has a built-in PID regulator. The input of the regulator is the voltage signal collected by the built-in AD module of the controller. The AD module will perform signal sampling on the twenty-fourth output terminal 24 . The output of the regulator is the voltage value output by the DAC module, and the voltage value is output to the twenty-sixth port 36 for fine-tuning the duty cycle of the pulse signal. The mean value circuit obtains the signal mean value through the twenty-fifth resistor 25 and the large capacitor 26, which reflects the duty ratio of the output pulse signal. The resulting change in DC level is related to the change in capacitance. In order to make the instrument have the best sensitivity, the DC voltage value of the twenty-fourth output terminal 24 needs to be adjusted to 1/2VCC, which is the target voltage of the PID controller. The clock signal of the multivibrator is provided by the built-in timer module of the controller. The output of the timer module is the twenty-ninth output terminal 29, and the signal frequency is 20kHz. The fortieth capacitor 40 , the forty-first capacitor 41 and the forty-second capacitor 42 are three decoupling capacitors for filtering the power supply.

It should be noted that, before performing the water pipe detection function, it is firstly determined whether the instrument is in the wall-attached state through the wall-attached detection circuit in Fig. 5 . The infrared emitting diode 52 is always in working state under the control of the control port 55 . Due to the existence of the baffle 58, the infrared signal cannot affect the infrared receiver 53, and the output terminal fifty-sixth port 56 of the infrared receiver 53 is at a high level. When the instrument is close to the wall surface 54, the infrared signal is reflected by the wall, the signal is received by the infrared receiver 53, and the output signal jumps, indicating that the instrument is in the wall-attached state. At this point the capacitive sensor starts to work.

See Figure 13 for the program flow of the water pipe detection function. The water pipe detection function of the instrument needs to be selected first, and then the wall detection is performed. Do not start the calibration procedure until the instrument judges that it is now against the wall. Calibration stops when the output DC signal of the calibration sensor is near 1/2VCC. Record the output signal of the sensor at this moment and start the measurement procedure. When the difference between the output DC signal amplitude and the initial voltage amplitude exceeds a certain range, it indicates that there is a water pipe near the instrument. The controller then monitors the output DC signal until the difference between the signal and the original signal begins to attenuate, then the indicator signal starts to indicate the center position. Through the built-in fitting formula of the controller, the degree of deviation of the instrument from the center position is calculated from the output signal of the sensor and displayed. During the measurement, if the instrument leaves the wall, or the user selects other detection functions, the program will clear the data of the initial voltage and the voltage value of the adjustment terminal, and wait for the next measurement process.

The implementation process of the wire detection function of a multifunctional wall detector of the present invention will be described in detail below in conjunction with the accompanying drawings.

Please see Figure 2, Figure 6 and Figure 7. The first copper-clad laminate 13, the second copper-clad laminate 14, and the third copper-clad laminate 15 used for detection are distributed in one plane, and the three copper-clad laminates are arranged equidistantly, and the horizontal center lines are aligned. The circuit design mainly includes a bias voltage supply unit 702 , a high impedance amplification unit 701 and an impedance transformation unit 703 .

When the copper clad laminate is close to the wire, the alternating magnetic field generated by the alternating current in the wire forms an eddy current in the copper clad laminate. At this time, the entire copper clad laminate is not an equipotential body. Connect the test points of each copper clad laminate to obtain Weak 50Hz signal. Connect the signal obtained on the copper clad board to the high impedance amplifier circuit. The seventy-first capacitor 71 in FIG. 7 is a DC blocking capacitor, which removes the DC component in the signal. The deflection voltage is obtained by dividing the voltage of the eighty-first resistor 81 and the eighty-second resistor 82, and connected to the gate of the first-stage MOS transistor 73 through the seventy-second resistor 72. In order to ensure the stability of the bias voltage, three The filter capacitors, the eighty-fifth capacitor 85 , the eighty-sixth capacitor 86 , and the eighty-seventh capacitor 87 use 104 capacitors to remove signal noise. The output voltage of the first stage MOS transistor 73 is output from the drain. The main function of the second-stage MOS transistor 74 is impedance transformation, the amplification factor is close to 1, and the output is output from the source port 80 . The first-level MOS transistor 73 and the second-level MOS transistor 74 are integrated into the same chip 75 . Three copper-clad plates are arranged side by side to help determine the center position of the wire.

See Figure 14 for the program flow of the wire detection function. After the instrument is turned on, it automatically enters the wire detection mode. The controller continuously collects the output voltage of the three copper clad boards through the built-in AD module. Calculate the peak-to-peak voltage of the output 50Hz signal. Normalize the three peak voltages. Next, the program judges the relationship between the peak-to-peak values of the three voltages. When the difference between the three signal amplitudes is not much different, the center indication is not performed, and the intensity indication is performed only according to the average value of the three voltages through the fitting formula built in the controller, that is, the distance between the wire and the instrument is displayed. When the amplitudes of the three signals are quite different, the center will be displayed, and the signal with the largest amplitude will be used to display the intensity through the built-in fitting formula.

The implementation process of the metal detection function of a multifunctional wall detector of the present invention will be described in detail below in conjunction with the accompanying drawings.

Please refer to Fig. 2, Fig. 8, Fig. 9, Fig. 10, Fig. 11 and Fig. 12. The realization of the metal detection function requires the use of a transmitting winding, 100, a differential receiving coil 9, a fine-tuning coil 12, and a filter circuit 394 and a bias circuit 395 Finish. The transmitting winding 100 is a self-winding coil, as shown in FIG. 8 , which is formed by uniformly winding an ordinary enameled wire 101 on a frame 106 and has a certain inductance value. When connected to the circuit, a proper one hundred and second capacitor 102 can be selected to form a current resonance circuit 110 . The excitation signal 103 of the resonant circuit comes from the square wave signal generated by the timer module of the controller, and the frequency and phase of the square wave signal are controlled by the program. The one hundred and fourth resistor 104 and the one hundred and fifth capacitor 105 smooth the generated square wave.

The current in the coil can generate a magnetic field, interlink with the differential receiving coil 9 , and generate an induction signal output on the differential receiving coil 9 . Since the differential receiving coil 9 adopts a differential coil receiving form, when there is no metal object to be measured around the instrument, the parameter design of the receiving coil can ensure that the output signal of the receiving coil is 0, and the differential coil is in a balanced state at this time. When there is a metal object around the instrument, the metal object will affect the distribution of the electromagnetic field, resulting in a change in the magnetic field flux of the differential receiving coil 9, and finally resulting in a change in the voltage value and phase value of the output signal.

The differential receiving coil of this design uses a PCB coil, and the differential receiving coils are all designed on a double-layer circuit board. Please refer to Figure 10, in order to ensure the balance of the differential receiving coils, it is necessary to design coils with different winding directions to be connected in series. Therefore, the differential coil of this design includes the following four parts: the first receiving coil group 8 , the second receiving coil 9 , the third receiving coil 10 , and the fourth receiving coil 11 . The four receiving coils are connected in series and are concentric with the transmitting winding. : the winding direction of the first receiving coil group 8 and the fourth receiving coil 11 is consistent, and the winding direction of the second receiving coil 9 and the third receiving coil 10 is opposite. Therefore, through a reasonable design of the coil, it can be guaranteed that the sum of the magnetic flux of the coil is zero when there is no object to be measured. The design of the fine-tuning coil 12 can ensure that a better balanced state can still be achieved when there are processing errors in the size of the circuit board. The trimming coil 12 is connected in series between the third receiving coil 10 and the fourth receiving coil 11 . The fine-tuning coil 12 is composed of two concentric coils with the same direction but different radii. The smaller radius is called the inner ring 135 and the larger radius is called the outer ring 136 . These two coils are divided into four sections: the first section 141, the second section 142, the third section 143, and the fourth section 144. The angles of the four arcs are 24°, 48°, 96°, and 192°. . Through 4 pairs of MOS tube switches: the third MOS tube switch 150, the fourth MOS tube switch 151, the fifth MOS tube switch 152, and the sixth MOS tube switch 153 select whether the above-mentioned circular arcs are connected in series to receive in the coil. The receiving area surrounded by arcs with different radii is different. Therefore, choosing arcs with different angles to connect to the receiving coil can change the receiving area of the receiving coil. Therefore, the purpose of fine-tuning the differential coil can be achieved through the gating of the MOS tube, so as to ensure the balance of the differential coil. Whether the differential coil itself reaches a balanced state will directly affect the detection range of the instrument. Therefore, the design of the fine-tuning coil in the balanced coil is very important.

The output signal of the detection coil 390 is mixed with many noise signals, and the signal itself is very weak. In order to achieve the purpose of metal detection, the present invention designs a signal processing circuit, as shown in Figure 11 and Figure 12, for processing the output signal. The circuit is divided into an amplifying circuit 393, a filter circuit 394 and a subsequent bias circuit 395, the amplifying circuit 393 is a non-inverting amplifying circuit, and the filtering circuit 394 is an infinite gain filtering circuit.

The model of the first operational amplifier 391 used in the amplification part is TLC2272, and the ratio of the 401st resistor 401 to the 402nd resistor 402 determines the amplification factor of the amplifier. The filter is an infinite gain feedback filter, designed based on the second operational amplifier 392, and the model is TLC2272. The first operational amplifier 391 used in the non-inverting amplifier and the second operational amplifier 392 used in the filter are integrated in the same chip. The non-inverting input of the amplifier circuit uses an LC filter circuit, which is composed of a chip inductor 416 and a chip capacitor 420. The amplifier input resistor 401st resistor 401 and the feedback resistor 402nd resistor 402 determine the signal amplification factor. Four hundred and fifteen capacitors 415 are a small capacitor for frequency compensation. The 418th capacitor 418 is a straight capacitor, and the 419th resistor 419 is a matching resistor, which outputs the signal to the filter. By selecting 411 resistors 411 , 412 resistors 412 , 413 capacitors 413 and 414 capacitors 414 , the cutoff frequency of the filter can be obtained. The cut-off frequency of the filter circuit is consistent with the frequency of the excitation signal, which is 5KHz. In order to collect the output signal, it is necessary to add a DC component to the signal so that the signal voltage is within the conversion range of the AD adopting module 405 . The DC component is obtained by dividing the voltage between the 407th resistor 407 and the 408th resistor 408 . The output signal passes through the 404th capacitor 404 without a DC component, and the 419th resistor 419 and the 410th capacitor 410 form an RC low-pass filter.

In the controller, the data obtained by the AD sampling module will be processed, and the FFT algorithm is used to calculate the phase of the output signal. Since the signal frequency here is fixed at 5KHz, the fixed-point FFT algorithm is used to obtain the phase information of the signal, and then the phase is compared with the phase of the square wave signal. The lead or lag of the phase reflects the magnetic permeability of the measured object. Since ferrous metals and non-ferrous metals have different magnetic permeability, it can be identified whether the detected object is ferrous metal or non-ferrous metal through this difference.

Please refer to Figure 15 for the program flow of the metal detection in the present invention. After the instrument is turned on, when the user selects the metal detection function, it enters the metal detection state. The controller sends an exciting square wave signal to make the transmitting winding work in the current resonance state. Perform AD sampling and record the phase information of the square wave signal at this time. After the sampling is completed, the obtained data are processed by mean value filtering, middle finger filtering and other methods. The phase information of the signal is calculated by the FFT algorithm module. Get the difference between the signal phase and the square wave phase and subtract the fixed phase shift of the circuit from the result to get the final result. The measurement is repeated many times, and finally the phase mean value 208 is obtained. When the absolute value of the phase mean value exceeds a certain threshold, the phase information is retained, indicating the presence of a metal object. If the average value of the phase is less than a certain threshold, clear the displayed information and re-measure. If there is a measured object, the built-in fitting formula can indicate the approximate intensity information of the metal object, and through the lead lag of the phase information, it can be judged whether the measured object belongs to ferrous metal or non-ferrous metal. Comparing the phase information obtained by this measurement with the last measurement result, if the absolute value of the phase decreases significantly, the center position of the measured object is judged. The software sets the center position judgment flag, and uses the phase information at this time to correct the relevant parameters of the built-in center position fitting formula of the controller. In the next measurement, the obtained phase information is displayed directly using the intensity information, and the center position is displayed. If the absolute value of the phase mean value obtained in a certain measurement is less than a certain threshold, exit the measurement, clear the stored data, and start another measurement.

The above-mentioned embodiments are only preferred embodiments for fully illustrating the invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention shall be determined by the claims.

Claims (10)

1. multifunctional wall body detection instrument comprises five parts:

First is the water pipe detection circuit, is composed in series with capacitive transducer (300), single-shot trigger circuit (304), average circuit (307) order by water gage glass;

Second portion is the electric wire detection circuit, is composed in series in proper order with covering copper (14), high impedance amplifying circuit (701), impedance inverter circuit (703) by visiting electric wire;

Third part is the metal detection circuit, is composed in series by emission winding (100), parallel resonance circuit (110), differential received coil (9), amplifying circuit (393), filtering circuit (394), biasing circuit (395) order;

The 4th part is auxiliary circuit, is composed in series by infrared transmitter (52), infrared remote receiver (53) order;

The 5th part is control circuit, comprises controller (400);

Described first, second portion, third part, the 4th part are independent respectively to be connected with described the 5th part.

2. multifunctional wall body detection instrument according to claim 1, it is characterized in that: also comprise main body pcb board (1), described water gage glass with capacitive transducer (4), described spy electric wire with cover copper (14), described differential received coil (9) is integrated on the described main body pcb board (1).

3. multifunctional wall body detection instrument according to claim 1 is characterized in that: described controller (400) comprises that water pipe is surveyed control module, circuit is surveyed control module, metal detection control module; Described water pipe detection control module, circuit are surveyed control module, the metal detection control module is integrated in the described controller (400); Surveying control module with described water pipe after described first water pipe detection circuit and described the 4th part auxiliary circuit parallel connection is connected; Described second portion electric wire detection circuit is surveyed control module with described circuit and is connected; Described third part metal detection circuit is connected with described metal detection control module.

4. multifunctional wall body detection instrument according to claim 2, it is characterized in that: described main body pcb board (1) comprises backboard (2) and top board (3) two sides, described first water pipe detection circuit and described second portion electric wire detection circuit are integrated on described backboard (2) face, and described third part metal detection circuit is integrated on described top board (3) face.

5. multifunctional wall body detection instrument according to claim 1, it is characterized in that: described water gage glass comprises first pole plate (4), second pole plate (5), tri-electrode (6) with capacitive transducer (4), described first pole plate (4), second pole plate (5), tri-electrode (6) constitute electric capacity (301) together, described second pole plate (5) is as the main pole of described electric capacity (301), described first pole plate (4) and described second pole plate (6) are cascaded, and constitute the inferior utmost point of described electric capacity (301).

6. multifunctional wall body detection instrument according to claim 1, it is characterized in that: described differential received coil (9) comprises first receiving coil (8), second receiving coil (9), the 3rd receiving coil (10), the 4th receiving coil (11) and alihnment coil (12), described first receiving coil (8), second receiving coil (9), the 3rd receiving coil (10), the 4th receiving coil (11) series connection, described alihnment coil (12) is connected among described the 3rd receiving coil (10) and described the 4th receiving coil (11), described first receiving coil (8), the 3rd receiving coil (10), the 4th receiving coil (11) is positioned on described top board (3) face, and described second receiving coil (9) is positioned on described backboard (2) face.

7. multifunctional wall body detection instrument according to claim 1, it is characterized in that: described spy electric wire comprises first copper-clad plate (13), second copper-clad plate (14), the 3rd copper-clad plate (15) with covering copper (14), and described first copper-clad plate (13), second copper-clad plate (14), the 3rd copper-clad plate (15) horizontal center line align and equidistantly be arranged on described backboard (2) face.

8. multifunctional wall body detection instrument according to claim 1, it is characterized in that: described first water pipe detection circuit comprises that also first reference voltage provides unit (302), second reference voltage provides unit (303), power supply (305), narrow-band impulse produces circuit (306), described narrow-band impulse produces circuit (306) and is connected on described single-shot trigger circuit (304) between described average circuit (307), and described power supply (305) is respectively described first reference voltage unit (302) is provided, second reference voltage provides unit (303), narrow-band impulse produces circuit (306) and average circuit (307) power supply.

9. multifunctional wall body detection instrument according to claim 1, it is characterized in that: described second portion electric wire detection circuit comprises that also bias voltage provides unit (702), and described bias voltage provides unit (702) to be described high impedance amplifying circuit (701), impedance inverter circuit (703) power supply.

10. multifunctional wall body detection instrument according to claim 1, it is characterized in that: described emission winding (100) is from coiling, comprise common enameled wire (101), skeleton (106), described common enameled wire (101) uniform winding is on described skeleton (106).

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