CN104266744A - Hot line type air noise detector - Google Patents
Hot line type air noise detector Download PDFInfo
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- CN104266744A CN104266744A CN201410581548.XA CN201410581548A CN104266744A CN 104266744 A CN104266744 A CN 104266744A CN 201410581548 A CN201410581548 A CN 201410581548A CN 104266744 A CN104266744 A CN 104266744A
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- resistance
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- platinum wire
- sampling channel
- operational amplifier
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Abstract
The invention discloses a hot line type air noise detector which comprises a sampling channel allowing air fluid to pass through, a platinum wire resistor RH and a temperature compensation resistor RT, wherein the platinum wire resistor RH and the temperature compensation resistor RT are arranged in the sampling channel, high-potential ends of both the platinum wire resistor RH and the temperature compensation resistor RT are respectively connected with a positive electrode of a direct current power supply, the high-potential end of the platinum wire resistor RH is connected with an emitting electrode of a triode Q1, a base electrode of the triode Q1 is connected with an output end of an integrated operational amplifier U2, a low-potential end of the temperature compensation resistor RT is connected with a resistor R1 and a resistor R2 in series, a low-potential end of the platinum wire resistor RH is connected with a resistor R3 in series, a connecting point between the serially connected resistors R1 and R2 is connected with an inverted input end of the integrated operational amplifier U2, and a high-potential end of the resistor R3 is connected with an in-phase input end of the integrated operational amplifier U2 and a voltage sampling signal input end of a single chip microcomputer. The hot line type air noise detector has the advantages that the position of the air noise is detected, and the size of the air noise can be conveniently displayed.
Description
Technical field
The airborne noise that the present invention relates to for seal edge gas leakage of running at high speed detects, and especially relates to hot-wire airborne noise detector.
Background technology
At present, airborne noise detects adopt more and pressurizes and foam method, also has and adopts the stethoscope of doctor to listen to method, electric torch light leak test method etc.These methods often need more than two people, and the at substantial time is detected repeatedly, and accuracy is very low, and often occurs deviation.Traditional airborne noise detection method can accurately not provide the position of noise appearance and the size of noise, brings difficulty to the reason detecting airborne noise appearance, easily causes misjudgment yet.The technological deficiency existed in the prior aries such as test accuracy is low, use is inconvenient, becomes the technical matters that those skilled in the art are anxious to be resolved.
Summary of the invention
The object of the invention is to provide a kind of hot-wire airborne noise detector.
For achieving the above object, the present invention takes following technical proposals:
Hot-wire airborne noise detector of the present invention, comprise for the sampling channel by air fluid, be arranged on the platinum wire resistance RH in described sampling channel and thermo-compensator RT, described platinum wire resistance RH is connected with DC power anode through sampling channel sidewall with the hot end difference sealed insulation of thermo-compensator RT, and platinum wire resistance RH hot end is also connected with triode Q1 emitter; Described triode Q1 collector is connected with DC power anode, and its base stage is connected with integrated operational amplifier U2 output terminal; The cold end sealed insulation of thermo-compensator RT connects DC power cathode with resistance R1, resistance R2 after connecting through sampling channel sidewall; The cold end sealed insulation of platinum wire resistance RH passes after sampling channel sidewall is connected with resistance R3 and connects DC power cathode; Tie point between described resistance in series R1, resistance R2 is connected with the inverting input of described integrated operational amplifier U2, and the hot end of described resistance R3 is connected with the in-phase input end of integrated operational amplifier U2 and the voltage sampling signal input end of single-chip microcomputer respectively; The data output end of described single-chip microcomputer is connected with display.
The platinum filament that platinum wire resistance RH is 0.07mm by diameter forms.
The invention has the advantages that the position can not only measured airborne noise and occur, and the size of airborne noise can be shown easily.The present invention does not need to do pressurized operation, adopts pressurization or foam method of testing than tradition, more convenient and accurately higher.The airborne noise that the present invention is mainly used in running at high speed after the gas leakage of seal edge detects, as the detection of the airborne noises such as windshield sealing place, train windshield seals place, windshield seals place, naval vessel, the especially detection of airborne noise (wind noise) in galloping.
Accompanying drawing explanation
Fig. 1 is circuit principle structure schematic diagram of the present invention.
Embodiment
As shown in Figure 1, hot-wire airborne noise detector of the present invention, comprise for being arranged on platinum wire resistance RH in described sampling channel and thermo-compensator RT by the sampling channel 1 of air fluid, the platinum filament that platinum wire resistance RH is 0.07mm by diameter forms, platinum wire resistance RH is connected with DC power anode VCC through sampling channel 1 sidewall with the hot end difference sealed insulation of thermo-compensator RT, and platinum wire resistance RH hot end is also connected with triode Q1 emitter; Described triode Q1 collector is connected with DC power anode VCC, and its base stage is connected with integrated operational amplifier U2 output terminal; The cold end sealed insulation of thermo-compensator RT connects DC power cathode with resistance R1, resistance R2 after connecting through sampling channel 1 sidewall; The cold end sealed insulation of platinum wire resistance RH passes after sampling channel 1 sidewall is connected with resistance R3 and connects DC power cathode; Tie point between described resistance in series R1, resistance R2 is connected with the inverting input of described integrated operational amplifier U2, and the hot end of described resistance R3 is connected with the in-phase input end of integrated operational amplifier U2 and the voltage sampling signal input end of single-chip microcomputer 2 respectively; The data output end of described single-chip microcomputer 2 is connected with display 3.
Principle of work of the present invention is summarized as follows:
Cooling effect when the present invention adopts air to flow through platinum wire resistance RH is made.Main circuit is made up of platinum wire resistance RH, thermo-compensator RT, resistance R1, resistance R2 and resistance R3, integrated operational amplifier U2, triode Q1 etc.Sampling channel 1 is a platinum wire resistance RH and thermo-compensator RT of 0.07mm built with a diameter.Platinum wire resistance RH, thermo-compensator RT, resistance R1, resistance R2 and resistance R3 form Wheatstone bridge circuit.According to the characteristic of Wheatstone bridge circuit, as cornerwise resistance value (RT+R1) × R3=RH × R2, Wheatstone bridge is in equilibrium state, and A point (resistance R2 hot end) is equal with B point (resistance R3 hot end) current potential.When platinum wire resistance RH by flow through Air flow time, the ptc characteristics of platinum wire resistance RH makes its resistance value diminish, described A, B 2 is caused to produce potential difference (PD), integrated operational amplifier U2 detects that potential difference (PD) rear drive triode Q1 conducting is to increase the electric current flow through on platinum wire resistance RH, such platinum wire resistance RH temperature rises immediately, its resistance value becomes large, until A, B 2 current potentials recover equal, Wheatstone bridge replys equilibrium state.The voltage relationship entering air mass flow in sampling channel 1 and B point is: the air mass flow entered in sampling channel 1 becomes greatly, and the resistance of platinum wire resistance RH diminishes thereupon, and the electric current flowing through platinum wire resistance RH becomes large thereupon, and B point voltage becomes large thereupon.In Wheatstone bridge circuit, use thermo-compensator RT as a bridge arm, effect avoids circuit to occur temperature drift.Like this, just the change of the air mass flow by sampling channel 1 is converted to the variable quantity of electric current, the variable quantity of this electric current makes again the voltage at resistance R3 two ends change, carry out calculation process in the voltage input single-chip microcomputer 2 changed at resistance R3 two ends, namely obtain the size of airborne noise and shown by display 3.During detection, the air in of sampling channel 1 is placed in detection site.
Claims (2)
1. a hot-wire airborne noise detector, it is characterized in that: comprise for the sampling channel by air fluid, be arranged on the platinum wire resistance RH in described sampling channel and thermo-compensator RT, described platinum wire resistance RH is connected with DC power anode through sampling channel sidewall with the hot end difference sealed insulation of thermo-compensator RT, and platinum wire resistance RH hot end is also connected with triode Q1 emitter; Described triode Q1 collector is connected with DC power anode, and its base stage is connected with integrated operational amplifier U2 output terminal; The cold end sealed insulation of thermo-compensator RT connects DC power cathode with resistance R1, resistance R2 after connecting through sampling channel sidewall; The cold end sealed insulation of platinum wire resistance RH passes after sampling channel sidewall is connected with resistance R3 and connects DC power cathode; Tie point between described resistance in series R1, resistance R2 is connected with the inverting input of described integrated operational amplifier U2, and the hot end of described resistance R3 is connected with the in-phase input end of integrated operational amplifier U2 and the voltage sampling signal input end of single-chip microcomputer respectively; The data output end of described single-chip microcomputer is connected with display.
2. hot-wire airborne noise detector according to claim 1, is characterized in that: the platinum filament that platinum wire resistance RH is 0.07mm by diameter forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410581548.XA CN104266744A (en) | 2014-10-27 | 2014-10-27 | Hot line type air noise detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410581548.XA CN104266744A (en) | 2014-10-27 | 2014-10-27 | Hot line type air noise detector |
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| Publication Number | Publication Date |
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| CN104266744A true CN104266744A (en) | 2015-01-07 |
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| CN201410581548.XA Pending CN104266744A (en) | 2014-10-27 | 2014-10-27 | Hot line type air noise detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432706A (en) * | 2021-06-04 | 2021-09-24 | 北京大学 | On-chip integrated acoustic vector gradient sensor chip and implementation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19701997A1 (en) * | 1997-01-22 | 1998-02-05 | Erich Lippmann | Damped pre-amplifier for use with electrodynamic seismic transducer |
| US5925821A (en) * | 1997-06-17 | 1999-07-20 | Societe National Industrielle | Device for measuring noise in a pipe traversed by a fluid |
| JP4422066B2 (en) * | 2005-05-24 | 2010-02-24 | パナソニック株式会社 | Membrane stiffness measuring apparatus and membrane stiffness measuring method |
| CN101995279A (en) * | 2009-08-10 | 2011-03-30 | 上海捷程机电有限公司 | Thermal flow sensor |
| CN202075992U (en) * | 2011-05-06 | 2011-12-14 | 江苏技术师范学院 | Detection and automatic control device of multimedia sound source signal |
| CN203672479U (en) * | 2013-12-29 | 2014-06-25 | 长安大学 | Noise detection, alarm and prompt apparatus for engineering machinery cab |
-
2014
- 2014-10-27 CN CN201410581548.XA patent/CN104266744A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19701997A1 (en) * | 1997-01-22 | 1998-02-05 | Erich Lippmann | Damped pre-amplifier for use with electrodynamic seismic transducer |
| US5925821A (en) * | 1997-06-17 | 1999-07-20 | Societe National Industrielle | Device for measuring noise in a pipe traversed by a fluid |
| JP4422066B2 (en) * | 2005-05-24 | 2010-02-24 | パナソニック株式会社 | Membrane stiffness measuring apparatus and membrane stiffness measuring method |
| CN101995279A (en) * | 2009-08-10 | 2011-03-30 | 上海捷程机电有限公司 | Thermal flow sensor |
| CN202075992U (en) * | 2011-05-06 | 2011-12-14 | 江苏技术师范学院 | Detection and automatic control device of multimedia sound source signal |
| CN203672479U (en) * | 2013-12-29 | 2014-06-25 | 长安大学 | Noise detection, alarm and prompt apparatus for engineering machinery cab |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432706A (en) * | 2021-06-04 | 2021-09-24 | 北京大学 | On-chip integrated acoustic vector gradient sensor chip and implementation method thereof |
| CN113432706B (en) * | 2021-06-04 | 2022-02-11 | 北京大学 | On-chip integrated acoustic vector gradient sensor chip and implementation method thereof |
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Application publication date: 20150107 |