CN101246145A - Hand-hold wall hollow drum fast detecting instrument - Google Patents
Hand-hold wall hollow drum fast detecting instrument Download PDFInfo
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- CN101246145A CN101246145A CNA200810070713XA CN200810070713A CN101246145A CN 101246145 A CN101246145 A CN 101246145A CN A200810070713X A CNA200810070713X A CN A200810070713XA CN 200810070713 A CN200810070713 A CN 200810070713A CN 101246145 A CN101246145 A CN 101246145A
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Abstract
The invention provides a portable type wall hollow expansion fast detecting instrument, relating to a wall hollow expansion of device, particularly relating to a handhold type wall hollow expansion fast detecting instrument. The handhold type fast detecting instrument for detecting hollow expansion of wall has the merits of fast detecting speed, high accuracy, simple structure, convenient operation and low cost. It is equipped with handhold type detector, microphone, signal processing circuit, singlechip, analog switch, result output circuit and power. The input end signal processing circuit is connected with microphone, the analog switch is respectively connected with output end of the signal processing circuit and the pulse width signal input end of singlechip, the pulse width signal output end of singlechip is connected with input end of result output circuit.
Description
Technical field
The present invention relates to a kind of hollowing pick-up unit, especially relate to a kind of hand-hold wall hollow drum fast detecting instrument.
Background technology
Because the hollowing in the construction wall will cause the adhesion failure of metope/facing and main wall body, have a strong impact on the quality of body of wall bulk strength and ground surface finishing, facing construction, cause seepage, even cause coming off of metope/clay facing tile, therefore the detection of hollowing be the commercial house quality testing and maintenance important step (1, " building ground engineering construction quality acceptance specification " (GB50209-2002), the Ministry of Construction; 2, " Code for construction quality acceptance of building decoration " (GB50210-2001), the Ministry of Construction).But generally adopt artificial hammering method owing to detect at present the main method of wall hollow drum, therefore exist problems such as subjective random big and accuracy rate is low (3, Wang Qingtai, prevent that exterior wall from inlaying the measure that the furring brick hollowing comes off, operating technique, 1995 (1), 37; 4, Lu Kaian, glazed tile finish coat hollowing and the reason and the control that come off, New Building Materials, 1999 (12), 24-25).The employing pointwise is knocked the method for carrying out the automatic detection of acoustics and is then had the slow shortcoming of detection speed in actual applications.
Summary of the invention
The objective of the invention is to mainly rely on manually and knock at the existing wall hollow drum that detects, subjective random big, accuracy rate is low, the employing pointwise is knocked the method for carrying out the automatic detection of acoustics and is then existed detection speed slow in actual applications, lack problems such as checkout equipment, provide that a kind of detection speed is fast, accuracy is high, simple in structure, easy to operate, hand-hold wall hollow drum fast detecting instrument that cost is low.
Technical scheme of the present invention is to utilize the hand-held detection head to carry out the hollowing detection at the sliding friction sound of surface of wall.
The present invention is provided with hand-held detection head, microphone, signal processing circuit, single-chip microcomputer, analog switch, output circuit and power supply as a result.Signal processing circuit input termination microphone, analog switch is connected with the pulse width signal input end of signal processing circuit output terminal and single-chip microcomputer respectively, the pulse width detection signal output terminal access node fruit output circuit input end of single-chip microcomputer.
The hand-held detection head is provided with handle, connecting rod and friction head, and connecting rod is provided with the microphone fixed support, is used for fixing microphone.
Signal processing circuit is provided with amplifying circuit, low-pass filter circuit, low pass envelope detection circuit, subtracter, first threshold compataror, bandwidth-limited circuit, the logical envelope detection circuit of band, totalizer, second threshold compataror and signal intensity display circuit.Input amplifier connects microphone, low-pass filter circuit input termination amplification circuit output end, low pass envelope detection circuit input termination low-pass filter circuit output terminal, low pass envelope detection circuit output terminal connects subtracter input end and totalizer input end respectively, the subtracter output termination first threshold compataror input end, first threshold compataror output termination analog switch; Bandwidth-limited circuit input termination amplification circuit output end, the logical envelope detection circuit input end tape splicing pass filter circuit output end of band, the logical envelope detection circuit output terminal of band connects subtracter input end and totalizer input end respectively, adder output connects the second threshold compataror input end, and the second threshold compataror output terminal connects analog switch and signal intensity display circuit input end respectively.
Hollowing of the present invention detects principle: the characteristic and the wall body structure of the acoustical signal that excites in hand-held detection head and the metope sliding friction process have direct relation, when detection head during in the friction of healthy surface of wall, sliding friction sound low frequency part energy is abundant, the HFS energy is less; For the hollowing body of wall, except direct grating, the friction of detection head and metope will cause producing in the hollowing the higher time song of a large amount of frequencies.The acoustical signal medium-high frequency that produces when therefore, the present invention is by hand-held detection head slip body of wall and the relative intensity of low frequency part judge whether body of wall exists hollowing.Owing to do not need to carry out pointwise and do not knock, produce acoustical signal but adopt, so detection speed accelerates greatly in the surface of wall sliding friction, be convenient to realize the detection of large tracts of land body of wall.
Signal processing circuit is a key of the present invention, and its characteristics are to adopt simple and reliable circuit design to carry out the feature extraction of sliding friction acoustical signal, and the hollowing that detects the high frequency characteristics that produces in the sliding friction process returns song.
Compare with conventional detection, the present invention has following outstanding advantage:
1. detection speed is fast, is applicable to the detection of large tracts of land construction wall;
2. simple in structure, cost is low;
3. hand-held detects, and is easy to operate.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention.
Fig. 2 is the structural representation of the hand-held detection head of the embodiment of the invention.
Fig. 3 is the vertical view of Fig. 2.
Fig. 4 is the hand-held detection head of the embodiment of the invention and the annexation synoptic diagram of microphone.
Fig. 5 is amplifying circuit, low-pass filter circuit and the bandwidth-limited circuit schematic diagram of the embodiment of the invention.
Fig. 6 is the low pass envelope detection circuit schematic diagram of the embodiment of the invention.
Fig. 7 is the logical envelope detection circuit schematic diagram of the band of the embodiment of the invention.
Fig. 8 is subtracter, totalizer, first threshold compataror and second threshold compataror of the embodiment of the invention, and the schematic diagram of signal intensity display circuit.
Fig. 9 is the single chip circuit schematic diagram of the embodiment of the invention.
Embodiment
Following examples will the present invention is further illustrated in conjunction with the accompanying drawings.
Referring to Fig. 1, the present invention is provided with hand-held detection head 1, microphone 2, signal processing circuit (signal processing circuit is provided with amplifying circuit 3, low-pass filter circuit 4, low pass envelope detection circuit 5, subtracter 6, first threshold compataror 7, bandwidth-limited circuit 8, the logical envelope detection circuit 9 of band, totalizer 10, second threshold compataror 11 and signal intensity display circuit 12), single-chip microcomputer 13, analog switch 14, output circuit 15 and power supply as a result.Amplifying circuit 3 input termination microphones 2, low-pass filter circuit 4 input termination amplifying circuits 3 output terminals, low pass envelope detection circuit 5 input termination low-pass filter circuits 4 output terminals, low pass envelope detection circuit 5 output terminals connect subtracter 6 input ends and totalizer 10 input ends respectively, subtracter 6 output terminations first threshold compataror 7 input ends, first threshold compataror, 7 output termination analog switches 14; Bandwidth-limited circuit 8 input termination amplifying circuits 3 output terminals, logical envelope detection circuit 9 input end tape splicing pass filter circuit 8 output terminals of band, logical envelope detection circuit 9 output terminals of band connect subtracter 6 input ends and totalizer 10 input ends respectively, totalizer 10 output terminations second threshold compataror 11 input ends, second threshold compataror, 11 output terminals connect analog switch 14 and signal intensity display circuit 12 input ends respectively.The pulse width signal input end of analog switch 14 output terminals and single-chip microcomputer 13 is connected, pulse width detection signal output terminal access node fruit output circuit 15 input ends of single-chip microcomputer 13.
Referring to Fig. 2～4, hand-held detection head 1 is provided with handle 16, connecting rod 17, detection head and microphone fixed support 18.
The hand-held detection head is used for being handed by operating personnel and carries out sliding friction at surface of wall and excite the acoustical signal that is used to detect, the last stainless steel right cylinder of welding of steel pipe as connecting rod 17 as detection head, wooden handle 16 is installed in the other end, being used for the handled easily personnel holds, pass through microphone fixed support 18 of bolt (adopting annular plastics microphone boot) simultaneously on the pipe, be used for microphone 2 is fixed in connecting rod 17.
Wire microphone adopts the sky, Guangzhou to open up the moving-coil type wire microphone series MD-890 type of Mike Manufacturing Co., Ltd, frequency range: 50-16kHz sensitivity :-53dB ± 3dB; Output impedance: 600 ohm ± 30%; Directive property: heart type.
Below provide concrete principle of work of the present invention.
The wire microphone collection sliding friction acoustical signal that is fixed on the hand-held detection head is divided into two-way through amplifying, and wherein one the tunnel carries out low-pass filtering (filter cutoff frequency is located at the common upper limiting frequency of body of wall grating), envelope detection; Bandpass filtering (filter transmission band is made as hollowing and returns the common frequency range of song), envelope detection are carried out in another road, the output of two-way envelope detection is sent into subtracter and is subtracted each other, on behalf of mantle friction sound and hollowing, subtract each other the result return the relative intensity of song, first threshold compataror is sent in subtracter output, is used to detect intensity poor that hollowing returns song itself and mantle friction sound when strong; Simultaneously, in order to guarantee that the detection head friction has enough intensity, the output of two-way envelope detector is sent into totalizer and is carried out sending into after the addition second threshold compataror and carry out amplitude relatively, second threshold compataror output pulse is used to control the conductive channel of an analog switch, this analog switch is sent in the output of low pass threshold compataror, when the detection acoustic signal intensity is enough big, the conducting of second threshold compataror output pulse control analog switch, the output of first threshold compataror is sent into single-chip microcomputer by analog switch and is carried out the pulsewidth detection, judges whether to exist hollowing and exports testing result according to the width detection result.
Referring to Fig. 5, body of wall detection acoustical signal enters the amplifier formation after microphone MIC input U1A amplifier oppositely amplifies 10 times, divide two-way then: one tunnel process is by three amplifier U1B, U1C, the centre frequency 6KHZ that U1D forms, the Q value is two second-order bandpass filter filtering of 1.5, the cutoff frequency of leading up to is 4KHZ, by the active low-pass filter that amplifier U2A constitutes, be with logical and low-pass filtering respectively.
Referring to Fig. 6 and 7, the low-pass filtering output signal is by amplifier T2A and diode D1, the half-wave rectifying circuit that D2 forms, get forward voltage through diode D3 then, again through capacitor C 5 and a low-pass filter of forming by resistance R 12 and capacitor C 6, just obtain envelope, and export through the output buffer that the see-saw circuit and the amplifier T2D of amplifier T2C composition form.
The bandpass filtering output signal is taken out envelope by similar envelope detector.
Referring to Fig. 8, the low pass that obtains and the logical two-way envelope of band are sent into U2B totalizer and the U2D subtracter that amplifier constitutes respectively carry out addition, additive operation, the output of addition, subtraction operation is sent into two threshold compataror U1, the U2 and the adjustable threshold that are made of operational amplifier LM311 respectively and is compared.Wherein two-way envelope signal sum is used to relatively judge at the thresholding of the second threshold compataror U1 and variable resistor R31 setting whether detect acoustical signal has enough intensity, and the difference of two-way envelope signal is used for relatively judging that at the thresholding of the first threshold compataror U2 and variable resistor R29 setting detection sound hollowing returns the intensity whether the ring signal intensity surpasses the wall friction signal.The pulse of second threshold compataror U1 output inserts the passage control end of 4052 analog switch U4, is used to control the gating of the pulse of first threshold compataror U2 output.The principle that signal intensity shows is: green emitting diode of pulsed drive of second threshold compataror U1 output, if green light is bright, the expression detection signal strength is enough.
Amplifier all adopts TL084 in the circuit.
Referring to Fig. 9, the output signal of analog switch U4 is sent into the p3.2 of single chip computer AT 89C2051, carries out pulse width by Single Chip Microcomputer (SCM) program and judges.One-chip machine port p1.6 connects the red light light emitting diode, is used to represent testing result.
Below provide Single Chip Microcomputer (SCM) program.
AT89C2051 Single Chip Microcomputer (SCM) program inventory is as follows:
START：
MOV TH0, #00H; T0 puts number
MOV?TL0，#00H
MOV?R0，#70H
JNB P3.2, L2; Judge whether to receive
SETB TR0; The sprocket pulse width
JB?P3.2，$
CLRTR0
MOV@R0, TH0; Preserve data
INC?R0
MOV@R0，TL0
CLR?C
MOV?A，71H
SUBB A, #B8H; Judge whether greater than 3ms.
MOV?A，70H
SUBB?A，#0BH
JNC?REL2；
AJMP START; Less than 3ms, red light does not work
REL2：
SETB P1.6; Greater than 3ms, red light is bright, just represents that body of wall has hollowing
DELAY3
CPL?P1.6
AJMP?START
Annotate: clock frequency hypothesis 12M.
DE1AY3: time-delay 10ms subroutine
Claims (3)
1. hand-hold wall hollow drum fast detecting instrument is characterized in that being provided with hand-held detection head, microphone, signal processing circuit, single-chip microcomputer, analog switch, output circuit and power supply as a result.Signal processing circuit input termination microphone, analog switch is connected with the pulse width signal input end of signal processing circuit output terminal and single-chip microcomputer respectively, the pulse width detection signal output terminal access node fruit output circuit input end of single-chip microcomputer.
2. hand-hold wall hollow drum fast detecting instrument as claimed in claim 1 is characterized in that the hand-held detection head is provided with handle, connecting rod and friction head, and connecting rod is provided with the microphone fixed support.
3. hand-hold wall hollow drum fast detecting instrument as claimed in claim 1, it is characterized in that signal processing circuit is provided with amplifying circuit, low-pass filter circuit, the low pass envelope detection circuit, subtracter, first threshold compataror, bandwidth-limited circuit, the logical envelope detection circuit of band, totalizer, second threshold compataror and signal intensity display circuit, input amplifier connects microphone, low-pass filter circuit input termination amplification circuit output end, low pass envelope detection circuit input termination low-pass filter circuit output terminal, low pass envelope detection circuit output terminal connects subtracter input end and totalizer input end respectively, the subtracter output termination first threshold compataror input end, first threshold compataror output termination analog switch; Bandwidth-limited circuit input termination amplification circuit output end, the logical envelope detection circuit input end tape splicing pass filter circuit output end of band, the logical envelope detection circuit output terminal of band connects subtracter input end and totalizer input end respectively, adder output connects the second threshold compataror input end, and the second threshold compataror output terminal connects analog switch and signal intensity display circuit input end respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200810070713XA CN100573135C (en) | 2008-03-07 | 2008-03-07 | Hand-hold wall hollow drum fast detecting instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200810070713XA CN100573135C (en) | 2008-03-07 | 2008-03-07 | Hand-hold wall hollow drum fast detecting instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101246145A true CN101246145A (en) | 2008-08-20 |
| CN100573135C CN100573135C (en) | 2009-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200810070713XA Expired - Fee Related CN100573135C (en) | 2008-03-07 | 2008-03-07 | Hand-hold wall hollow drum fast detecting instrument |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675105A (en) * | 2013-12-24 | 2014-03-26 | 邹燕燕 | Ceramic tile hole detection data collection device |
| CN103926318A (en) * | 2014-04-30 | 2014-07-16 | 国家电网公司 | Wall or ground empty drum detector |
| CN105116053A (en) * | 2015-09-29 | 2015-12-02 | 江苏建研建设工程质量安全鉴定有限公司 | Hollowing detecting device based on digital displaying |
| CN108398485A (en) * | 2018-01-25 | 2018-08-14 | 上海众材工程检测有限公司 | A kind of hollowing detection method and system based on wall |
| CN109324117A (en) * | 2018-10-26 | 2019-02-12 | 广东飞码机器人科技有限公司 | A kind of audio technology building hollowing detector and robot and method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6134968A (en) * | 1999-07-19 | 2000-10-24 | The Boeing Company | Portable acoustic impedance measurement system |
| CN2581992Y (en) * | 2002-11-29 | 2003-10-22 | 韩文彬 | Bulging detector for wall and floor |
-
2008
- 2008-03-07 CN CNB200810070713XA patent/CN100573135C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675105A (en) * | 2013-12-24 | 2014-03-26 | 邹燕燕 | Ceramic tile hole detection data collection device |
| CN103675105B (en) * | 2013-12-24 | 2016-06-29 | 湖北省建筑材料节能检测中心有限公司 | A kind of hole detection data collection device laying ceramic tile |
| CN103926318A (en) * | 2014-04-30 | 2014-07-16 | 国家电网公司 | Wall or ground empty drum detector |
| CN105116053A (en) * | 2015-09-29 | 2015-12-02 | 江苏建研建设工程质量安全鉴定有限公司 | Hollowing detecting device based on digital displaying |
| CN108398485A (en) * | 2018-01-25 | 2018-08-14 | 上海众材工程检测有限公司 | A kind of hollowing detection method and system based on wall |
| CN109324117A (en) * | 2018-10-26 | 2019-02-12 | 广东飞码机器人科技有限公司 | A kind of audio technology building hollowing detector and robot and method |
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|---|---|
| CN100573135C (en) | 2009-12-23 |
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Granted publication date: 20091223 Termination date: 20130307 |