CN101246034A - Acoustic liquid level alarm of liquid reservoir - Google Patents
Acoustic liquid level alarm of liquid reservoir Download PDFInfo
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- CN101246034A CN101246034A CNA2008100707159A CN200810070715A CN101246034A CN 101246034 A CN101246034 A CN 101246034A CN A2008100707159 A CNA2008100707159 A CN A2008100707159A CN 200810070715 A CN200810070715 A CN 200810070715A CN 101246034 A CN101246034 A CN 101246034A
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Abstract
A liquid storage tank acoustic liquid level alarm relates to a liquid level alarm device. The present invention provides a liquid storage tank acoustic liquid alarm device which not only avoids the direct contact to the liquid but also need not transmitting signal initiatively, and has the characters of easy structure, low cost and the like. The alarm device is arranged with a microphone, a signal processing circuit, a single chip and an alarm output circuit. The input end of the signal processing circuit is connected to the microphone, the output end of the signal processing circuit is connected to the width detecting input interface of the single chip, and the width detecting result output end of the single chip is connected to the input end of the alarm output circuit. The signal processing circuit is arranged with an amplifying circuit, a band-pass wave filtering circuit, an envelope detection circuit and a threshold comparison circuit, the input end of the amplifying circuit is connected to the microphone, the output end of the amplifying circuit is connected to the input end of the envelope detection circuit through the band-pass wave filtering circuit, the output end of the envelope detection circuit is connected to the input end of the threshold comparison circuit, and the output end of the threshold comparison circuit is connected to the width detecting input interface of the single chip.
Description
Technical field
The present invention relates to a kind of liquid level alarm device, especially relate to a kind of acoustics liquid level alarm that is used for fluid reservoir.
Background technology
The measurement of fluid reservoir liquid level, warning are being brought into play crucial effect in the crucial industry of national economy such as oil and chemical industry, and it is related to problems such as production safety, Industry Control.Along with the continuous development of science and technology, tank level is measured with alarm technique flourish, and function is constantly perfect.
Current, both at home and abroad the tank level measuring method mainly is divided into contact and contactless two kinds.Contact accurate measurement method commonly used has capacitance type liquid level measuring and magnetostriction type to measure two kinds.But contact type measurement is subjected to some restrictions owing to the characteristics that will contact with liquid in application.Non-contact measurement mainly contains ultrasonic liquid-level measurement and radargrammetry etc.Wherein, continue the correct reception of emission and echoed signal, cause the restriction of aspects such as power consumption, instrument installation but ultrasonic liquid-level measurement need guarantee ultrasonic signal because advantages such as cheap, the dependable performance of ultrasonic liquid-level measurement are used widely.
Notification number is that the utility model patent of CN2715124 discloses the ultrasonic liquid level alarm device of a kind of explosion-proof type, comprise external labeling type ultrasonic probe that is used to be installed on the wet tank outer wall and the transmitter that is attached thereto, ultrasonic probe is to have the explosion-proof type transducer that transmits and receives function concurrently, and ultrasonic probe links to each other with signal input terminal with the signal output terminal of transmitter simultaneously.The detectable signal lead-out terminal of signal processor links to each other with ultrasonic probe by the amplifier that transmits; the detectable signal of signal processor receives terminal and links to each other with ultrasonic probe by receiving signal amplifier and received signal limited amplitude protection device, and alarm signal output ends of signal processor links to each other with the panalarm controller.
Summary of the invention
The purpose of this invention is to provide a kind of both having avoided and directly contact, do not need again initiatively to transmit with liquid, easy to use, the acoustic liquid level alarm of liquid reservoir that has characteristics such as simple in structure, that cost is low simultaneously.
Technical scheme of the present invention is to carry out level gauging by the resonant frequency of measuring the storage tank in-cavity, its principle of work is when the fluid reservoir fluid injection, along with increasing of liquid level, the volume of the resonant cavity that liquid level and tank body form reduces gradually, the resonant frequency of the normal mode that resonance cavity liquid injecting sound excites will increase gradually, so liquid level can be obtained by the resonant frequency of measuring the tank body resonant cavity.
The present invention is provided with microphone, signal processing circuit, single-chip microcomputer and warning output circuit.Signal processing circuit input termination microphone, the signal processing circuit output terminal connects the width detection input interface of single-chip microcomputer, and the width detection of single-chip microcomputer is output terminal output circuit input end taking alarm as a result.Signal processing circuit is provided with amplifying circuit, bandwidth-limited circuit, envelope detection circuit and thresholding comparator circuit, input amplifier connects microphone, amplification circuit output end connects the envelope detection circuit input end through bandwidth-limited circuit, envelope detection circuit output termination thresholding comparator circuit input end, thresholding comparator circuit output terminal connects the width detection input interface of single-chip microcomputer.
Microphone can adopt electret microphone.
Concrete principle of work of the present invention is: the liquid knockout sound that utilizes the broad frequency band that fluid reservoir liquid filling process excites is as the sound source that excites storage tank resonant cavity normal mode, be arranged at after the acoustical signal that the microphone collection liquid filling in the tank body excites through amplifying, carry out envelope detection behind the bandpass filtering (the filter center frequency is located at the resonant frequency place that needs the alarm water level correspondence), thresholding relatively detects (width of Threshold detection gained pulse has been represented the acoustic signal intensity on this resonant frequency), the output that thresholding relatively detects is sent into single-chip microcomputer and is carried out width detection, and judge according to the width detection result, if reach the liquid level of setting, then output alarm signal.
This shows that the present invention has following outstanding advantage:
1. belong to passive measurement, utilize the interior fluid injection sound of tank body, need not initiatively to transmit as exciting sound source;
2. easy to install, simple in structure, cost is low.
Description of drawings
Fig. 1 is that the structure of the embodiment of the invention is formed and the use synoptic diagram.
Fig. 2 is the amplifying circuit and the bandwidth-limited circuit theory of constitution figure of the embodiment of the invention.
Fig. 3 is the envelope detection circuit theory of constitution figure of the embodiment of the invention.
Fig. 4 is the single-chip microcomputer pulse width detection circuit and the warning output circuit theory of constitution figure of the embodiment of the invention.
Embodiment
Following examples will the present invention is further illustrated in conjunction with the accompanying drawings.
Signal processing circuit input termination microphone, the signal processing circuit output terminal connects the width detection input interface of single-chip microcomputer, and the width detection of single-chip microcomputer is output terminal output circuit input end taking alarm as a result.
Referring to Fig. 1, the present invention is provided with microphone 1, signal processing circuit (being made up of amplifying circuit 2, bandwidth-limited circuit 3, envelope detection circuit 4 and thresholding comparator circuit 5), single-chip microcomputer 6 and warning output circuit 7.Amplifying circuit 2 input termination microphones 1, amplifying circuit 2 output terminals connect envelope detection circuit 4 input ends through bandwidth-limited circuit 3, envelope detection circuit 4 output termination thresholding comparator circuits 5 input ends, thresholding comparator circuit 5 output terminals connect the width detection input interface of single-chip microcomputer 6.
During use, utilize 9 pairs of fluid reservoirs of liquid injection pipe 8 to carry out the liquid knockout sound of the broad frequency band that excites in the liquid filling process as the sound source that excites fluid reservoir resonant cavity normal mode, be arranged at after the acoustical signal that the microphone 1 collection liquid filling in fluid reservoir 8 tank bodies excites through amplifying, carry out envelope detection behind the bandpass filtering (the filter center frequency is located at the resonant frequency place that needs the alarm water level correspondence), thresholding relatively detects (width of Threshold detection gained pulse has been represented the acoustic signal intensity on this resonant frequency), the output that thresholding relatively detects is sent into single-chip microcomputer and is carried out width detection, and judge according to the width detection result, if reach the liquid level of setting, then output alarm signal.
Referring to Fig. 2, the SGOFM6022P-C type omni-directional diaphragm-vibrating type electret microphone that microphone (the microphone code name in Fig. 2 is MIC) can adopt Yin state, Ningbo City acousto-optic Electronics Co., Ltd. to produce, the correlated performance data are as follows: directive property: omnidirectional, impedance: low-resistance, current drain: Max 500mA≤0.5mA, operating voltage: 1.5～10V, change of sensitivity: change in voltage 1.5V in 3dB, noiseization: 〉=54dB.Liquid injection pipe 8 and microphone 1 are located at the top of fluid reservoir 9, the integrated circuit U1A amplifier stage of acoustical signal input amplifying circuit behind electret microphone that fluid injection excites in fluid reservoir 9 tank bodies oppositely amplifies 10 times, again through one by 3 operational amplifier U1B, U1C, the centre frequency that U1D forms is set at 1kHZ, the Q value is two second-order bandpass filter filtering of 5, and the tank body resonant cavity resonance acoustical signal of the resonant frequency 1kHz corresponding with specific level is carried out filtering.In actual use, can adjust the bandwidth-limited circuit centre frequency by the resistance R among change Fig. 2 and the value of capacitor C element according to the physical size and the need alarm liquid level of fluid reservoir.
Referring to Fig. 3, filtered signal is by operational amplifier T3A and diode D1, and the half-wave rectifying circuit that D2 forms is got forward voltage through diode D3 then, through capacitor C 5 and a low-pass filter of forming by resistance R 12 and capacitor C 6, just obtain signal envelope again.
Referring to Fig. 4, band inserts single chip computer AT 89C2051 by port P3.2 after leading to envelope and adjustable threshold process comparer U2 (LM311), handles through single-chip microcomputer, and Single Chip Microcomputer (SCM) program is carried out pulse width and detected, and controls the demonstration of diode D2 according to testing result.If pulsewidth is greater than 2ms, then illustrating has this frequency resonance acoustical signal of sufficient intensity to be excited in the tank body resonant cavity, illustrate that the fluid reservoir resonant cavity has reduced to the volume of setting the liquid level correspondence, single-chip microcomputer is lighted red light emitting diodes LED by port P1.4 and is reported to the police, and operational amplifier is made of TL084 in circuit.
Below provide the system program of the embodiment of the invention.
Single Chip Microcomputer (SCM) program is as follows:
START：
MOV TMOD, #09H; The timer working method is set
MOV TH0, #00H; T0 puts number
MOV?TL0，#00H
MOV?R0，#70H
JNB P3.2, $; Judge whether to receive
SETB TR0; The sprocket pulse width
JB?P3.2，$
CLR?TR0
MOV@R0, TH0; Preserve data
INC?R0
MOV@R0，TL0
CLR?C
MOV?A，71H
SUBB A, #D0H; Judge whether greater than 2ms.
MOV?A，70H
SUBB?A，#07H
JNC?REL2；
AJMP START; Less than 2ms, red light does not work
REL2：
SETB P1.4; Greater than 2ms, red light is bright, liquid level warning
DELAY3
CPL?P1.4
AJMP?START
Annotate: the single-chip microcomputer clock frequency is assumed to be MHz
DE1AY3: time-delay 10ms subroutine.
Claims (3)
1. acoustic liquid level alarm of liquid reservoir, it is characterized in that being provided with microphone, signal processing circuit, single-chip microcomputer and warning output circuit, signal processing circuit input termination microphone, the signal processing circuit output terminal connects the width detection input interface of single-chip microcomputer, and the width detection of single-chip microcomputer is output terminal output circuit input end taking alarm as a result.
2. acoustic liquid level alarm of liquid reservoir as claimed in claim 1, it is characterized in that signal processing circuit establishes amplifying circuit, bandwidth-limited circuit, envelope detection circuit and thresholding comparator circuit, input amplifier connects microphone, amplification circuit output end connects the envelope detection circuit input end through bandwidth-limited circuit, envelope detection circuit output termination thresholding comparator circuit input end, thresholding comparator circuit output terminal connects the width detection input interface of single-chip microcomputer.
3. acoustic liquid level alarm of liquid reservoir as claimed in claim 1 is characterized in that microphone is an electret microphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810070715A CN100595525C (en) | 2008-03-07 | 2008-03-07 | Acoustic liquid level alarm of liquid reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810070715A CN100595525C (en) | 2008-03-07 | 2008-03-07 | Acoustic liquid level alarm of liquid reservoir |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101246034A true CN101246034A (en) | 2008-08-20 |
| CN100595525C CN100595525C (en) | 2010-03-24 |
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ID=39946615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810070715A Expired - Fee Related CN100595525C (en) | 2008-03-07 | 2008-03-07 | Acoustic liquid level alarm of liquid reservoir |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100595525C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499374A (en) * | 2013-09-05 | 2014-01-08 | 江苏大学 | Method and system for ultrasonic dynamic liquid level measurement based on neural network |
| CN102954825B (en) * | 2011-08-26 | 2017-05-03 | 曼卡车和巴士股份公司 | Operating method for a vehicle |
| CN108362350A (en) * | 2018-02-26 | 2018-08-03 | 中国人民解放军国防科技大学 | Method and device for measuring residual volume of storage tank based on nonlinear acoustic cavity resonance |
| WO2019196176A1 (en) * | 2018-04-12 | 2019-10-17 | 刘铁楠 | Multifunctional drainage bottle |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2045479U (en) * | 1988-10-27 | 1989-10-04 | 程俊杰 | Apparatus for liquid level electronic display and autocontrol warner |
| CN2221779Y (en) * | 1994-01-13 | 1996-03-06 | 哈尔滨铁路第一工程处工程机械化工程段 | Digital level indicator and alarm for liquid-storage equipment |
| KR20020024493A (en) * | 2000-09-25 | 2002-03-30 | 장학수,유병준 | Sonic Water Level Measuring Method and Device |
| CN2715124Y (en) * | 2004-01-07 | 2005-08-03 | 高翔 | Blast-proof ultrasonic liquid level alarm device |
| CN2846753Y (en) * | 2005-07-08 | 2006-12-13 | 大庆石油管理局 | Novel liquid level guage for well drilling liquid |
-
2008
- 2008-03-07 CN CN200810070715A patent/CN100595525C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102954825B (en) * | 2011-08-26 | 2017-05-03 | 曼卡车和巴士股份公司 | Operating method for a vehicle |
| CN103499374A (en) * | 2013-09-05 | 2014-01-08 | 江苏大学 | Method and system for ultrasonic dynamic liquid level measurement based on neural network |
| CN103499374B (en) * | 2013-09-05 | 2016-06-15 | 江苏大学 | A kind of ultrasound wave dynamic liquid level detection method based on neutral net and system |
| CN108362350A (en) * | 2018-02-26 | 2018-08-03 | 中国人民解放军国防科技大学 | Method and device for measuring residual volume of storage tank based on nonlinear acoustic cavity resonance |
| CN108362350B (en) * | 2018-02-26 | 2019-12-03 | 中国人民解放军国防科技大学 | Method and device for measuring residual volume of storage tank based on nonlinear acoustic cavity resonance |
| WO2019196176A1 (en) * | 2018-04-12 | 2019-10-17 | 刘铁楠 | Multifunctional drainage bottle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100595525C (en) | 2010-03-24 |
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Granted publication date: 20100324 Termination date: 20130307 |