CN1425900A - Portable wave detector low frequency receiving voltage sensitivity performance measurer - Google Patents
Portable wave detector low frequency receiving voltage sensitivity performance measurer Download PDFInfo
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- CN1425900A CN1425900A CN 01144242 CN01144242A CN1425900A CN 1425900 A CN1425900 A CN 1425900A CN 01144242 CN01144242 CN 01144242 CN 01144242 A CN01144242 A CN 01144242A CN 1425900 A CN1425900 A CN 1425900A
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Abstract
The sensitivity performance measurer for low frequency voltage of portable wave detector includes sound field unit and electric circuit unit. The sound field unit is one sound pressure tank with driving sound source, signal output socket connected via wire to the standard detector and the measured detector inside the tank, and drive input socket connected via wire to the driving sound source, circular opening at the bottom for installing the drive sound source, which has belled mouth towards the openings. The drive input socket is also connected via cable to the output of the power amplifier in the electric circuit unit; and of the two signal output sockets one is connected via cable to the input of fixed gain amplifier in the circuit unit and the other to the input of program controlled amplifier.
Description
Technical field
The present invention relates to a kind of voltage sensitivity characteristic measuring instrument, particularly relate to a kind of bender hydrophone low frequency receiving voltage sensitivity characteristic test device.
Technical background
The measurement of bender hydrophone low frequency receiving voltage sensitivity characteristic was adopted usually by special measure case in the past, PC, power amplifier, the A/D capture card, printer, the standard wave detector, the test macro of compositions such as stube cable and dedicated operations software carries out, to measure needed even sound field and satisfy casing damping purpose in the measuring process in order to produce, the measure case volume reaches 80cm * 80cm * 80cm, weight reaches more than the 200-300 kilogram, add that whole measuring system is made up of many complete machines and a plurality of separate unit, make complicated operation, especially inconvenience is moved in carrying, therefore, this measuring system only is suitable for the laboratory, and test of places such as factory floor and calibration bender hydrophone use.Because bender hydrophone mostly is used in field work places such as down-hole or river, river, lake, pool, through use after a while, the performance parameter of bender hydrophone itself can change to some extent, need remeasure demarcation at the use scene, and the test macro of in the past being made up of above-mentioned a plurality of complete machines and heavy measure case is difficult to take the use work on the spot.
Summary of the invention
The object of the present invention is to provide a kind of by sound field device and circuit arrangement portable wave detector low frequency receiving voltage sensitivity performance measurer dimerous, wherein the sound field device is the airtight acoustic pressure jar of built-in sound source structure, and the sound field in the more special measure case of its inner sound field is more uniform and stable; And circuit arrangement is core with the single-chip microcomputer, and functional units such as the driving of collection sound source, signals collecting, data processing, output as a result are one, and are more simpler more in the past than the driving test macro of being made up of multimachine structures such as PC, power amplifier, A/D capture card, printers; Not only measuring accuracy meets the demands the portable wave detector low frequency receiving voltage sensitivity performance measurer that is made of both, stable performance, good reliability, and simple to operate, and conveniently moving can be fit to field work and use.
The technical solution adopted in the present invention is that it only forms (as shown in Figure 1) by sound field device and circuit arrangement two parts, wherein, the sound field device comprises tank shell, loam cake, handle, rubber ring, latch mechanism, signal output gang socket, drives input gang socket, support, driving sound source, tested wave detector and standard wave detector; And circuit arrangement includes power supply, digital controlled oscillator, power amplifier, fixed gain amplifier, gain-programmed amplifier, A/D converter, single-chip microcomputer, operation control key, display, storer, mini-printer, warning device and RS232 standard serial interface.Handle above the acoustic pressure jar loam cake is used to lift to be buckled lid and moves whole acoustic pressure jar, and rubber ring embeds the binding site between tank shell and loam cake, locks mechanism again to sealing between tank shell and the loam cake; Driving sound source is that a low-frequency cut-off frequency is less than the moving-coil type dynamic loudspeaker of 30Hz or the dynamic loudspeaker of other type, its hydraucone is fixed on the circular open place on plane, acoustic pressure jar bottom up, and the magnet steel of loudspeaker passes from the circular open of acoustic pressure jar baseplane and stretches to outside the acoustic pressure jar; The signal output gang socket of acoustic pressure jar side, in the acoustic pressure jar, link to each other with standard wave detector and tested wave detector or nautical receiving set respectively, outside the acoustic pressure jar, receive the fixed gain amplifier of circuit part and the input end of gain-programmed amplifier respectively by private cable; The driving input gang socket of acoustic pressure jar side links to each other with driving sound source (loudspeaker) in the acoustic pressure jar, then receives the output terminal of circuit part power amplifier outside the acoustic pressure jar by private cable.
Described circuit arrangement, it includes sound field driving circuit, signals collecting change-over circuit, control processing circuit and test result output circuit; Wherein the output of digital controlled oscillator links to each other with the input of power amplifier, delivers to driving sound source in the acoustic pressure jar by stube cable again, constitutes the sound field driving circuit; The output of fixed gain amplifier and gain-programmed amplifier connects the input of A/D converter, and the output of A/D converter links to each other with the data bus of single-chip microcomputer, and the gain control end of gain-programmed amplifier links to each other with the single-chip microcomputer delivery outlet, constitutes the signals collecting change-over circuit; The input port of single-chip microcomputer links to each other with the operation control key, and external extended memory is formed control processing circuit; The single-chip microcomputer expansion connects the output circuit that display, mini-printer, warning system and RS232 standard serial interface constitute test result.Wherein digital controlled oscillator and power amplifier provide required electric excitation signal to the sound field device; Finish collection and conversion by fixed gain amplifier, gain-programmed amplifier and A/D converter to wave detector or nautical receiving set low frequency receiving voltage sensitivity feature measurement signal, finish selection and operation by the operation control key to the various functions of instrument, by storer measurement data is preserved for a long time, by display, mini-printer and RS232 standard serial interface measurement result is exported transmission, underproof test result is reported to the police by warning system; And single-chip microcomputer the course of work of whole measuring system as the most important part of circuit arrangement according to the programmed control that writes in advance.
The present invention has adopted the principle of work of closed chamber relative method in the acoustic measurement for the measurement of bender hydrophone low frequency receiving voltage sensitivity characteristic, tested wave detector and standard wave detector are positioned in the even sound field in the airtight acoustic pressure jar (or etc. acoustic pressure zone in), under same sound pressure P effect, tested wave detector and standard wave detector produce two-way and low frequency receiving voltage sensitivity corresponding voltage signal V1 and V2 separately respectively, if tested wave detector and standard wave detector low frequency receiving voltage sensitivity separately is respectively M1 and M2, define according to the wave detector receiving voltage sensitivity: M1=V1/P and M2=V2/P, the ratio M1/M2 of two sensitivity, in fact be exactly the ratio (seeing formula 1) of two voltage V1 and V2, because the low frequency receiving voltage sensitivity value M2 of standard wave detector is known, therefore, the product of ratio V1/V2 that the low frequency receiving voltage sensitivity value M1 of tested wave detector can be by two measured voltages and known standard wave detector low frequency receiving voltage sensitivity M2 obtains, and sees formula (1) and (2).
Concrete principle of work is: the Single-chip Controlling digital controlled oscillator produces a low-frequency sine signal and deliver to driving sound source in the acoustic pressure jar by stube cable after power amplifier amplifies, at even low frequency sound field of the inner formation of acoustic pressure jar, the tested wave detector of acoustic pressure jar inside and standard wave detector are under the same sound pressure effect, produce two-way and low frequency receiving voltage sensitivity corresponding voltage signal separately, deliver to gain-programmed amplifier respectively and fixed gain amplifier amplifies by signal output gang socket and through special-purpose stube cable, carry out analog to digital conversion through A/D converter again, send single-chip microcomputer to do polarity discriminating and data processing then, last single-chip microcomputer send display to show the test data that obtains or send the mini-printer printout; The operation control key is used for input on the one hand and revises systematic parameter, tested wave detector sample number into spectrum, is used to select the operations function on the other hand; Storer is used for preserving selectively measurement result, the RS232 standard serial interface is used for that whole measurement results of preserving in the storer are passed to main control computer and carries out unloading or further processing, for the undesirable test result that occurs in the measuring process, warning device can provide corresponding alarm; Power supply mainly is made of non-maintaining high-energy battery, charging and electric weight testing circuit, except the power supply that the portable wave detector low frequency receiving voltage sensitivity performance measurer outside work is provided, and the charging of also available civil power edge work limit.
The program circuit of circuit arrangement part as shown in Figure 3, instrument start back program begins to carry out, at first to system initialization, content comprises the single-chip microcomputer initialization, as define I/O mouth kind, timer/counter kind and preset several initial values, define each interrupt type and right of priority, inside and outside memory allocation mode and content, the original state of the port address and the relevant device of serial communication mode and baud rate and SCM peripheral equipment.Then, its duty of instrument self checking is as sound field situation, fixed gain and programme-controlled gain two-way amplifier working condition, A/D converter situation etc.The defective alarm signal that provides of self check detects and the use of fixing a breakdown for operating personnel; The qualified back program run of self check is to measurement/input selection place, select for operating personnel, when selecting input, operating personnel can import or revise as systematic parameters such as standard geophone sensitivity value, tested wave detector (or nautical receiving set) sensitivity upper lower limit value, the direct current resistance upper lower limit value that includes matching transformer type wave detector (or nautical receiving set), frequency of operation.Otherwise directly enter measurement, import tested wave detector numbering, use for back storage transmission measurement data by operating personnel.After the input of tested wave detector numbering was finished, single-chip microcomputer started the work of numerical control sine-wave oscillator according to the previous frequency of operation that is provided with, and simultaneously the driving voltage signal is delivered to the driving sound source in the sound field device, to set up sound field.After sound field is stable, carry out data acquisition, the gain of Single-chip Controlling gain-programmed amplifier is so that get access to suitable test signal, and representative standard wave detector receiving voltage sensitivity, tested wave detector (or nautical receiving set) receiving voltage sensitivity after will amplifying again and each signal that includes the tested wave detector of matching transformer type (or nautical receiving set) direct current resistance send A/D converter to carry out analog to digital conversion respectively.Then the data after the conversion are handled, at first calculate tested wave detector (or nautical receiving set) low frequency receiving voltage sensitivity value, include the dc resistance of matching transformer type wave detector (or nautical receiving set), upper lower limit value separately with previous setting compares then, judges the polarity of tested wave detector (or nautical receiving set).After data processing is finished, carry out data output, show measurement result by nixie display scanning, the measurement result of need being selected by mini-printer prints, and by warning device off-limits measurement result is reported to the police.At this moment, preserve if desired measurement data can with measurement data in accordance with regulations memory address preserve, measure next time or show a preceding measurement result otherwise turn to; Transmit measurement result to the master control PC if desired, then the total data of preserving in the storer can be sent to the master control PC, measure next time or show a preceding measurement result otherwise also will turn to.
Portable wave detector low frequency receiving voltage sensitivity performance measurer of the present invention can be to the low frequency receiving voltage sensitivity value of present normally used various bender hydrophones (or nautical receiving set), wave detector polarity is measured, and also can measure the direct current resistance that includes matching transformer type wave detector (or nautical receiving set).
The invention has the advantages that:
One. airtight acoustic pressure jar structure design of the present invention, make that total system is simple to operate, it is easy to carry to move, sound field in the more special measure case of sound field that forms in the airtight acoustic pressure jar is more uniform and stable, to the measurement result of tested wave detector not only precision height, good reproducibility, but also reduced in the measuring process requirement to tested wave detector putting position in sound field.
Two. the circuit arrangement structural design of collection multifunctional all, the cost of complete machine is reduced, the simplification that is linked and packed has also improved the reliability of total system work greatly.
Three. selecting for use of the inner various high-performance electronic components and parts of circuit arrangement, the single-chip microcomputer main signal is handled robotization, makes simplified control in the measuring process, and efficient improves.
Four. whole measuring system not only is applicable to the laboratory, and use in the place of test such as factory floor and calibration bender hydrophone (or nautical receiving set), more is applicable to various field works place (occasion that comprises unpowered electricity) use, the applicability height.
Description of drawings
Fig. 1 is a fundamental diagram of the present invention;
Fig. 2 is a kind of example structure synoptic diagram of the present invention;
Fig. 3 is a program flow diagram of the present invention;
The drawing explanation
1-tank shell 2-loam cake
3-handle 4-rubber ring
5-latch mechanism 6-7 signal output gang socket
8-drives input gang socket 9-support
10-drives the tested wave detector of sound source 11-
The special-purpose stube cable of 12-standard wave detector 13-15
16-power supply 17-digital controlled oscillator
18-power generator 19-fixed gain amplifier
20-gain-programmed amplifier 21-A/D converter
22-single-chip microcomputer 23-operates control key
24-display 25-storer
26-mini-printer 27-warning device
28-RS232 standard serial interface 29-30 signal input gang socket
31-drives output gang socket 32-measuring instrument power switch
33-measuring instrument power light
Embodiment
Further specify preferred embodiment of the present invention in conjunction with above-mentioned accompanying drawing now, present embodiment is mainly formed (as shown in Figure 1) by sound field device and circuit arrangement two parts, wherein, the sound field device comprises tank shell 1, loam cake 2, handle 3, rubber ring 4, latch mechanism 5, signal output gang socket 6 and 7, drives input gang socket 8, support 9, drives sound source 10, tested wave detector 11 and standard wave detector 12; And circuit arrangement includes power supply 16, digital controlled oscillator 17, power amplifier 18, fixed gain amplifier 19, gain-programmed amplifier 20, A/D converter 21, single-chip microcomputer 22, operation control key 23, display 24, storer 25, mini-printer 26, warning device 27 and RS232 standard serial interface 28.The present embodiment concrete structure as shown in Figure 2, the left side is the sound field device, band drives the acoustic pressure jar (mainly referring to tank shell 1 and loam cake 2) of sound source in one, its diameter is 36mm, height is 40mm, is made by casting aluminium material; The acoustic pressure jar is airtight metal can, form by tank shell 1 and loam cake 2, a handle 3 is arranged above the loam cake 2, and rubber ring 4 embeds the binding site of 2 of tank shells and jar loam cakes, and has and a pair ofly the latch mechanism 5 that tank shell 1 and loam cake 2 are sealed and matched can be installed in tank shell port outside symmetric position; This latch mechanism 5 adopts two bulb nuts, two rotary handles and two rotation fixing pins, and each bulb nut, rotary handle and rotation fixing pin are formed a cover locking device, and two cover locking devices are symmetrically distributed in tank shell 1 external port both sides; Or this latch mechanism 5 locking mode of adopting the housing 1 that is similar on the pressure cooker and loam cake 2 to be sealed and matched.The jar baseplane has one and is used to install and fix the circular open that drives sound source, drive sound source and be a low-frequency cut-off frequency and be 30Hz, internal resistance 4 Ω, 60 watts of peak power outputs, diameter and be 6 inches internal magnetization high-fidelity dynamic loudspeaker, its hydraucone is fixed on the circular open place on plane, acoustic pressure jar bottom up, the magnet steel of loudspeaker passes from the circular open of acoustic pressure jar baseplane and stretches to outside the acoustic pressure jar, and two electrodes on the loudspeaker are wired to and drive the end that input gang socket is positioned at the acoustic pressure jar; Support 9 below the acoustic pressure jar is born by the duralumin rod of three φ 20 * 120mm, and the standard wave detector in the acoustic pressure jar selects for use a no matching transformer type bender hydrophone to bear, and physical dimension is φ 15m * 40m.The right is the instrument part, it has comprised the various piece in the foregoing circuit device, wherein operating control key 23, display 24, mini-printer 26, warning device 27 and RS232 standard serial interface 28 is distributed on the front panel of instrument, remainder then is designed on the interior mainboard of instrument box, in addition, the output terminal of the input end of fixed gain amplifier 19 and gain-programmed amplifier 20, power amplifier 18 also is introduced on the combination hub (29,30,31) of front panel.Two electrodes that drive on the sound source are wired to the end that driving input gang socket is positioned at the acoustic pressure jar; Signal output gang socket 6 is connected to the input end of fixed gain amplifier 19 in the circuit arrangement in the sound field device by cable 13; Signal output gang socket 7 is connected to gain-programmed amplifier 20 input ends in the circuit arrangement by cable 14 in the sound field device; Drive input gang socket 8 is connected to circuit arrangement intermediate power amplifier 18 by cable 15 output terminal in the sound field device.
Earlier acoustic pressure jar and instrument are partly coupled together by the mode that Fig. 2 gave with three private cables before measuring, open loam cake, whether the connection of checking acoustic pressure jar internal standard wave detector is correct, places in the acoustic pressure jar and connects tested wave detector or nautical receiving set, buckles well loam cake and locks with locking device.Open instrument front power switch 32 then, power light 33 is bright, and instrument is started working, and the associated button in the selection operation control key district, switch can carry out " input measure " and select as required.Can import or revise, sound field frequency and working method are set systematic parameter under the input state; Under the measurement state, can carry out the input test sample number into spectrum, start sequence of operations such as measuring, lock demonstration, instant printing, data storage, data transmission.If select the measurement state, instrument prompting input sample numbering, sample number into spectrum input back start to be measured, and at this moment, single-chip microcomputer produces the sine-wave oscillation signal according to the working method of setting, and forms sound field in the acoustic pressure jar; The two-way receiving voltage sensitivity signal that standard and tested two wave detectors produce in sound field send fixed gain amplifier and gain-programmed amplifier to amplify respectively, single-chip microcomputer can be according to the gain of the size adjustment gain-programmed amplifier of tested wave detector receiving voltage sensitivity signal, to obtain suitable amplitude, control A/D converter then and respectively the two paths of signals that is obtained is carried out analog to digital conversion, calculate again and handle after converting thereof into digital signal, at last various measurement results are sent display scan round to show that (this display selects for use five LED charactrons to form, wherein four show significant figure, and one shows polarity); Single-chip microcomputer does not meet the data result that preestablishes requirement as finding in data handling procedure, will provide prompting (warning device is made up of light emitting diode and piezoelectric buzzer, and type of alarm is a sound and light alarm) by warning device; The user is associated button in the selection operation control key district as required, shows operations such as locking, instant printing, data storage; If instrument and master control PC link, also can carry out data transmission, the full content that Instrument memory is kept send main control computer further to preserve and handle (program circuit of above instrument is referring to Fig. 3).
It more than is a groundwork process of the embodiment of the invention, put into airtight acoustic pressure jar from tested wave detector and connect lead-in wire, and build the locking loam cake, start and measure beginning, finish video data to measuring, all processes only took time about 40 seconds, was significantly less than original sound case test macro required time, and measuring accuracy meets the demands, measuring repeatability is good, thereby has realized reliable, practical, the measurement of bender hydrophone low-frequency voltage receiving sensitivity characteristic easily.
Claims (5)
1. portable wave detector low frequency receiving voltage sensitivity performance measurer, comprise sound field device and circuit arrangement, it is characterized in that: described sound field device is the acoustic pressure jar that band drives sound source in, acoustic pressure jar side is equipped with signal output gang socket (6), (7) and is driven input gang socket (8), wherein drive input gang socket in the acoustic pressure jar, link to each other with driving sound source (10) by lead, signal output gang socket (6) links to each other with standard wave detector (12) and tested wave detector (11) respectively by lead in the acoustic pressure jar with (7); Support (9) is fixed at the bottom of the acoustic pressure jar, the jar baseplane has one and is used to install and fix the circular open that drives sound source, driving sound source is a dynamic loudspeaker, its hydraucone is fixed on the circular open place on plane, acoustic pressure jar bottom up, the magnet steel that drives sound source passes from the circular open of acoustic pressure jar baseplane and stretches to outside the acoustic pressure jar, drives two electrodes on the sound source and is wired to and drives the end that input gang socket is positioned at the acoustic pressure jar; Signal output gang socket (6) is connected to the input end of fixed gain amplifier in the circuit arrangement (19) in the sound field device by cable (13); Signal output gang socket (7) is connected to gain-programmed amplifier in the circuit arrangement (20) input end by cable (14) in the sound field device; Drive input gang socket (8) is connected to circuit arrangement intermediate power amplifier (18) by cable (15) output terminal in the sound field device.
2. by the described portable wave detector low frequency receiving voltage sensitivity performance measurer of claim 1, it is characterized in that: described acoustic pressure jar is an airtight metal can, it mainly is made up of tank shell (1) and loam cake (2), a handle (3) is arranged above the loam cake (2), rubber ring (4) embeds the binding site between tank shell (1) and jar loam cake (2), and has and a pair ofly the latch mechanism (5) that tank shell (1) and loam cake (2) are sealed and matched can be installed in symmetric position outside the tank shell port.
3. by the described portable wave detector low frequency receiving voltage sensitivity performance measurer of claim 1, it is characterized in that: described driving sound source is that a low-frequency cut-off frequency should be that 4-8 Ω, peak power are not less than 50 watts less than 30Hz, impedance, and diameter is moving-coil type dynamic loudspeaker or the similar high-fidelity loudspeaker of other performance index more than six inches.
4. by the described portable wave detector low frequency receiving voltage sensitivity performance measurer of claim 1, it is characterized in that: described latch mechanism comprises two bulb nuts, two rotary handles and two rotation fixing pins, each bulb nut, rotary handle and rotation fixing pin are formed a cover locking device, two cover locking devices are symmetrically distributed in tank shell (1) external port both sides, or comprise the latch mechanism that the housing (1) that is used on the pressure cooker and loam cake (2) are sealed and matched.
5. by the described portable wave detector low frequency receiving voltage sensitivity performance measurer of claim 1, it is characterized in that: described circuit arrangement, it includes sound field driving circuit, signals collecting change-over circuit, control processing circuit and test result output circuit; Wherein the output of digital controlled oscillator (17) links to each other with the input of power amplifier (18), delivers to driving sound source in the acoustic pressure jar by stube cable again, constitutes the sound field driving circuit; The output of fixed gain amplifier (19) and gain-programmed amplifier (20) connects the input of A/D converter (21), the output of A/D converter (21) links to each other with the data bus of single-chip microcomputer (22), the gain control end of gain-programmed amplifier (20) links to each other with single-chip microcomputer (22) delivery outlet, constitutes the signals collecting change-over circuit; The input port of single-chip microcomputer (22) links to each other with operation control key (23), and external extended memory (25) is formed control processing circuit; Single-chip microcomputer (22) expansion connects the output circuit that display (24), mini-printer (26), warning system (27) and RS232 standard serial interface (28) constitute test result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01144242 CN1202406C (en) | 2001-12-14 | 2001-12-14 | Portable wave detector low frequency receiving voltage sensitivity performance measurer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01144242 CN1202406C (en) | 2001-12-14 | 2001-12-14 | Portable wave detector low frequency receiving voltage sensitivity performance measurer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1425900A true CN1425900A (en) | 2003-06-25 |
| CN1202406C CN1202406C (en) | 2005-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01144242 Expired - Fee Related CN1202406C (en) | 2001-12-14 | 2001-12-14 | Portable wave detector low frequency receiving voltage sensitivity performance measurer |
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| Country | Link |
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| CN (1) | CN1202406C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102384821A (en) * | 2011-08-10 | 2012-03-21 | 歌尔声学股份有限公司 | Test method, test tooling and test system for testing air tightness of loudspeaker module |
| CN103616649A (en) * | 2013-12-02 | 2014-03-05 | 暨南大学 | Magnetic field sensor sensitivity tuning method based on fiber bragg grating laser |
| CN109443515A (en) * | 2018-09-13 | 2019-03-08 | 中国船舶重工集团公司第七〇五研究所 | Test macro and method in a kind of small size hydrophone sensitivity air |
| CN110097683A (en) * | 2018-07-20 | 2019-08-06 | 深圳怡化电脑股份有限公司 | A kind of equipment self-inspection method, apparatus, ATM and storage medium |
-
2001
- 2001-12-14 CN CN 01144242 patent/CN1202406C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102384821A (en) * | 2011-08-10 | 2012-03-21 | 歌尔声学股份有限公司 | Test method, test tooling and test system for testing air tightness of loudspeaker module |
| CN102384821B (en) * | 2011-08-10 | 2015-07-29 | 歌尔声学股份有限公司 | Loudspeaker module air tightness testing method, test fixture and test macro |
| CN103616649A (en) * | 2013-12-02 | 2014-03-05 | 暨南大学 | Magnetic field sensor sensitivity tuning method based on fiber bragg grating laser |
| CN110097683A (en) * | 2018-07-20 | 2019-08-06 | 深圳怡化电脑股份有限公司 | A kind of equipment self-inspection method, apparatus, ATM and storage medium |
| CN109443515A (en) * | 2018-09-13 | 2019-03-08 | 中国船舶重工集团公司第七〇五研究所 | Test macro and method in a kind of small size hydrophone sensitivity air |
| CN109443515B (en) * | 2018-09-13 | 2021-05-14 | 中国船舶重工集团公司第七一五研究所 | System and method for testing sensitivity of small-size hydrophone in air |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1202406C (en) | 2005-05-18 |
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