CN109151695A - Electro-acoustic conversion efficiency measuring device and electro-acoustic conversion efficiency measurement method - Google Patents
Electro-acoustic conversion efficiency measuring device and electro-acoustic conversion efficiency measurement method Download PDFInfo
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- CN109151695A CN109151695A CN201710464344.1A CN201710464344A CN109151695A CN 109151695 A CN109151695 A CN 109151695A CN 201710464344 A CN201710464344 A CN 201710464344A CN 109151695 A CN109151695 A CN 109151695A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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Abstract
The present invention provides a kind of electro-acoustic conversion efficiency measuring device and electro-acoustic conversion efficiency measurement method, belongs to electro-acoustic conversion efficiency field of measuring technique, can solve the electro-acoustic conversion efficiency measurement method low efficiency of existing ultrasonic transducer, the problem of stability difference.Electro-acoustic conversion efficiency measuring device of the invention includes: the radiant force balance of the input electric power measurement module for measuring the input electric power of ultrasonic transducer and the output acoustic power for measuring ultrasonic transducer, electro-acoustic conversion efficiency measuring device further includes processing module, and processing module includes: the receiving unit for receiving input electric power and output acoustic power；For judging the whether stable judging unit of output acoustic power；For calculating the computing unit of electro-acoustic conversion efficiency according to input electric power and output acoustic power when output acoustic power is stablized.
Description
Technical field
The invention belongs to electro-acoustic conversion efficiency field of measuring technique, and in particular to a kind of electro-acoustic conversion efficiency measuring device and
Electro-acoustic conversion efficiency measurement method.
Background technique
According to ultrasonic transducer feature measurement international standard, electro-acoustic conversion efficiency by calculate energy converter output acoustic power with
The percentage of input electric power determines.Input electric power can be used electrodymamometer method or directly acquire energy converter both end voltage
The impedance method of electric current measures, and output acoustic power then generallys use radiant force balance measurement.
When the efficiency to ultrasonic transducer measures, it can use electrodymamometer measurement and obtain the defeated of ultrasonic transducer
Enter electrical power, the output acoustic power to work using radiant force balance measurement ultrasonic transducer in resonance point, to obtain its electricity
Sound transfer efficiency.But in the prior art, the output sound to be worked using radiant force balance measurement ultrasonic transducer in resonance point
The specific measurement of power is mostly based on manual measurement, and radiant force balance reading is unstable, and therefore, manual testing's workload is non-
Chang great.
Summary of the invention
The present invention is directed at least solve one of the technical problems existing in the prior art, one kind is provided and is quickly and stably surveyed
Measure the electro-acoustic conversion efficiency measuring device of the electro-acoustic conversion efficiency of ultrasonic transducer.
Solving technical solution used by present invention problem is a kind of electro-acoustic conversion efficiency measuring device, including is used for
Measure the input electric power measurement module of the input electric power of ultrasonic transducer and the output sound function for measuring ultrasonic transducer
The radiant force balance of rate, the electro-acoustic conversion efficiency measuring device further includes processing module, and the processing module includes:
For receiving the receiving unit of the input electric power and output acoustic power；
For judging the whether stable judging unit of the output acoustic power；
For calculating electroacoustic conversion according to the input electric power and output acoustic power when the output acoustic power is stablized
The computing unit of efficiency.
Preferably, the judging unit is specifically used for before the pre-determined bit for judging the received output acoustic power of adjacent moment
Whether part is identical, and if they are the same, then the output acoustic power is stablized, and otherwise the output acoustic power is unstable.
It is further preferred that the measurement accuracy of the radiant force balance is at least thousand quartiles；
The pre-determined bit is thousand quartiles.
Preferably, logical by serial ports between the processing module and the input electric power measurement module and radiant force balance
Letter connection.
Preferably, the processing module further include:
Control unit works under different frequency and driving power for controlling the ultrasonic transducer.
Preferably, the processing module further include:
Display unit, for being saved by XY figure control and showing the electro-acoustic conversion efficiency of the ultrasonic transducer.
Preferably, the input electric power measurement module includes:
Directional coupler, for will be used to drive the electrical power driving signal of ultrasonic transducer to be applied to ultrasonic transducer；
Electrodymamometer, for measuring the input electric power of ultrasonic transducer according to the coupled voltages of the directional coupler.
Solving another technical solution used by present invention problem is a kind of electroacoustic conversion for ultrasonic transducer
Efficiency measurement method, comprising:
Processing module receives the input electric power and radiant force day of the ultrasonic transducer of input electric power measurement module measurement
The output acoustic power of the ultrasonic transducer of flat measurement；
Processing module judges whether the output acoustic power is stable；
When the output acoustic power is stablized, processing module calculates electroacoustic according to the input electric power and output acoustic power
Transfer efficiency.
Preferably, the processing module judges whether the output acoustic power is stable and includes:
The measuring accuracy of the radiant force balance is at least thousand quartiles；
Whether the part before processing module judges thousand quartiles of the received output acoustic power of adjacent moment is identical, if
Identical, then the output acoustic power is stablized, and otherwise the output acoustic power is unstable.
Preferably, the processing module receives the input electric work of ultrasonic transducer measured by input electric power measurement module
Before the output acoustic power of ultrasonic transducer measured by rate and radiant force balance, further includes:
Processing module control ultrasonic transducer works under different frequency and driving power.
Electro-acoustic conversion efficiency measuring device of the invention is by processing module to input electric power measurement module and radiant force
The measurement data of balance such as is judged, is calculated at the processing, to obtain the electro-acoustic conversion efficiency of ultrasonic transducer.Pass through the electroacoustic
Transfer efficiency measuring device measures the electro-acoustic conversion efficiency of ultrasonic transducer, compared to the prior art in manual measurement, can be with
The stability of measured acoustical power is judged more quickly, to reduce the attachment probability of absorbing target blibbing and take off
The temperature rise rate of air water, and then improve the accuracy of measurement and the stability of measuring system.
Detailed description of the invention
Fig. 1 is the block diagram of the electro-acoustic conversion efficiency measuring device of the embodiment of the present invention 1；
Fig. 2 is the block diagram of the processing module of the embodiment of the present invention 1；
Fig. 3 is the flow chart of the electro-acoustic conversion efficiency measurement method of the embodiment of the present invention 2；
Fig. 4 is the display interface of the electro-acoustic conversion efficiency measurement method of the embodiment of the present invention 2.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, with reference to the accompanying drawing and specific embodiment party
Present invention is further described in detail for formula.
Embodiment 1:
As illustrated in fig. 1 and 2, the present embodiment provides a kind of electro-acoustic conversion efficiency measuring devices, (especially for ultrasonic transducer
Focus type ultrasonic transducer) electro-acoustic conversion efficiency measurement.
As shown in Figure 1, the electro-acoustic conversion efficiency measuring device includes input electric power measurement module, the gentle place in radiant force day
Manage module.Wherein,
The input electric power of input electric power measurement module measurement ultrasonic transducer.The input electric power measurement module can be with
Including oscillograph, input electric power is obtained by way of the voltage and current signals of oscilloscope measurement ultrasonic transducer.
Preferably, input electric power measurement module includes: directional coupler and electrodymamometer, and directional coupler is super by driving
The electrical power driving signal of sonic transducer is applied to ultrasonic transducer；Electrodymamometer is measured according to the coupled voltages of directional coupler
The input electric power of ultrasonic transducer.
Wherein, directional coupler is a kind of directive power coupling (distribution) element of tool, by direct-through line and coupling
Line is combined into four port devices, by certain coupling mechanism by direct-through line fl transmission and anti-between direct-through line and coupling line
A part into transimission power is coupled in coupling line.
The fl transmission in power transmission can be obtained by carrying out detection to the coupled voltages in coupling line in electrodymamometer
With reverse transfer (reflection) power.Wherein, the sample frequency of electrodymamometer is up to 1000kS/s, resolution ratio be 10bit, it can be achieved that
The faint transient wave of forward and backward electric drive power in the real-time monitoring energy converter course of work, to improve measurement efficiency.
Since ultrasonic transducer working frequency is matched hereinafter, preferably using in event the present embodiment based on series connection in 20MHz
The directional coupler of (Tandem Match) circuit.
The output acoustic power of radiant force balance measurement ultrasonic transducer.
Specifically, radiant force balance is based on Lang Zhiwan (Langevin) radiation pressure principle, absorbing target in ultrasonic field is measured
Or on reflecting target suffered acoustic propagation direction radiant force, be converted into the measurement dress of the output acoustic power of ultrasonic transducer
It sets.The area of the absorbing target of radiant force balance should be much larger than the output acoustic beam area of ultrasonic transducer, and ensure to export acoustic beam and exist
In water in vertical incidence to absorbing target, and sound source and target distance d should be sound focal length Fpress0.7 times, measure institute on target at this time
The output acoustic power of the radiant force F received, energy converter are calculated by formula (1).
In formula (1), c is the velocity of sound in water；β is focusing (partly) angle of ultrasonic transducer；β=arcsin (a/Fpress)；A is
The effective radius of ultrasonic transducer；α is the absorption coefficient in water；D is range, d=0.7Fpress。
Preferably, the measurement accuracy of radiant force balance is at least thousand quartiles, i.e., three after decimal point.
Processing module handles the measurement data of input electric power processing unit and radiant force balance, to obtain excess of export
The electro-acoustic conversion efficiency of sonic transducer.
In the present embodiment, processing module is preferably on computers based on the graphical language of virtual instrument technology
The host computer of LabVIEW exploitation.Measurement data (input electric work of the host computer to input power measurement equipment and radiant force balance
Rate and output acoustic power) it is handled and is analyzed, to quickly and easily obtain the electro-acoustic conversion efficiency of ultrasonic transducer.
Preferably, it is connected between processing module and input electric power measurement module and radiant force balance by serial communication,
To avoid the interference of electromagnetic signal.
As shown in Fig. 2, the processing module includes: receiving unit, judging unit and computing unit.Wherein,
Receiving unit receives input electric power and output acoustic power.
Preferably, by setting serial communication in each serial ports reading byte number come determine received data (including input
Electrical power and output acoustic power) different accuracy.
Judging unit judges whether output acoustic power is stable.
Due to being frequently encountered radiant force balance reading not when the electro-acoustic conversion efficiency to ultrasonic transducer is tested
Stable problem, therefore the present embodiment by judging unit judges whether output acoustic power is stable that (i.e. whether radiant force balance reading
Stablize), start to be emitted to the single measurement time for completing radiant force balance reading to reduce ultrasonic transducer, and then reduce and inhale
The temperature rise rate for receiving the attachment probability and de aerated water of target blibbing, reduces the measurement error as brought by the two, improves and survey
Measure accuracy.
Specifically, being used by the sound power level serial ports program in serial communication in the present embodiment and judging that structure is realized
Judgement to output acoustic power.
Preferably, judging unit is specifically used for the part before the pre-determined bit for judging the received output acoustic power of adjacent moment
Whether identical, if they are the same, then output acoustic power is stablized, and otherwise output acoustic power is unstable.
Wherein, pre-determined bit refers to certain one digit number of the received output acoustic power value of processing module, for example, a position, ten, very
Position, percentile etc..
The variation of the received output acoustic power of adjacent moment is judged by the part before judgement pre-determined bit, if being pre-positioned it
Preceding part is identical, then changes smaller, output acoustic power stabilization；If it is different, then changing greatly, output acoustic power is unstable.Root
According to the difference required measurement accuracy, pre-determined bit is also corresponding different.Preferably, it is pre-positioned as thousand quartiles.
It is further preferred that judging unit after judging that output acoustic power is stablized, also judges that receiving unit institute is received
Whether measurement data corresponds in time, when not to it is corresponding when continue to measurement data, until the received measurement data of institute when
Between on to it is corresponding when handle again, to guarantee the accuracy of measurement.
Computing unit calculates electroacoustic conversion effect when output acoustic power is stablized, according to input electric power and output acoustic power
Rate.
The output sound for passing through calculating ultrasonic transducer according to ultrasonic transducer feature measurement international standard, electro-acoustic conversion efficiency
The percentage of power and input electric power determines.
Specifically, fl transmission and reverse transfer electrical power progress deconsolidation process that computing unit obtains electrodymamometer,
Character string is converted by serial data, two character strings is split as with function is split, then turns the character string after fractionation
The two-dimensional array for being changed to double precision is saved, and after extracting one by one using index function, carries out numerical value calculating, show that electroacoustic turns
Change efficiency.
Preferably, processing module further includes control unit, controls ultrasonic transducer work under different frequency and driving power
Make.
Control unit controls ultrasonic transducer work under different frequency and driving power by the way that different test parameters is arranged
Make, to obtain ultrasonic transducer electro-acoustic conversion efficiency under different frequency and driving power.
Specifically, different test pattern: (1) setting signal source can be generated by signal source parameter in setting host computer
Initial frequency, scanning stepping and measurement data amount, can get the ultrasonic transducer electro-acoustic conversion efficiency under different frequency；(2) it sets
Signal source amplitude, initial frequency, scanning stepping and measurement data amount are set, can get the ultrasonic transducer electricity under different driving power
Sound transfer efficiency.
Preferably, processing module further includes metrical information recording module, and control unit is according in metrical information recording module
The work of the metrical information control ultrasonic transducer of institute's typing.
Preferably, processing module further includes display unit, is saved by XY figure control and shows the electroacoustic of ultrasonic transducer
Transfer efficiency.
LabVIEW provides a variety of datagraphics and shows that control, the present embodiment use XY figure control, passes through binding function spirit
The X living for changing waveform and showing, Y variable, simultaneous selection construction of condition are shown using Boolean variable dynamic control waveform, call XY
The preservation of figure control node realization waveform.
Preferably, processing module further includes system maintaining module, and voluntarily whether detection system operation is normal, is being broken down
When and alarm.
It is understood that electro-acoustic conversion efficiency measuring device may also include the electric works such as function generator, power amplifier
Rate driving equipment.Control unit control function generator generates pumping signal, then amplifies through power amplifier, generates electrical power and drives
Dynamic signal, and ultrasonic transducer to be measured, output acoustic power are applied to by directional coupler.
It should be noted that the gentle electrical power driving of input electric power measurement module, radiant force day in the present embodiment is set
Standby wait works in the broad frequency range of 20kHz-20MHz, to guarantee the test bandwidth of ultrasonic transducer electro-acoustic conversion efficiency.
Electro-acoustic conversion efficiency measuring device provided in this embodiment, by processing module to input electric power measurement module and
The measurement data of radiant force balance such as is judged, is calculated at the processing, to obtain the electro-acoustic conversion efficiency of ultrasonic transducer.Pass through
The electro-acoustic conversion efficiency measuring device measure ultrasonic transducer electro-acoustic conversion efficiency, compared to the prior art in artificial survey
Amount, can the stability more quickly to measured acoustical power judge, to reduce the attachment of absorbing target blibbing
The temperature rise rate of probability and de aerated water, and then improve the accuracy of measurement and the stability of measuring system.Meanwhile electroacoustic conversion effect
Serial communication is used in rate measuring device, avoids the interference of electromagnetic signal.
Embodiment 2:
As shown in Figures 3 and 4, the present embodiment provides a kind of electro-acoustic conversion efficiency measurement method of ultrasonic transducer, can pass through
The electro-acoustic conversion efficiency measuring device that embodiment 1 provides measures the electro-acoustic conversion efficiency of ultrasonic transducer.
As shown in figure 3, the electro-acoustic conversion efficiency measurement method includes:
S1, processing module receive the input electric power and radiant force of the ultrasonic transducer of input electric power measurement module measurement
The output acoustic power of the ultrasonic transducer of balance measurement.
Preferably, before S1, further includes: processing module controls ultrasonic transducer work under different frequency and driving power
Make.
Control unit controls ultrasonic transducer work under different frequency and driving power by the way that different test parameters is arranged
Make, to obtain ultrasonic transducer electro-acoustic conversion efficiency under different frequency and driving power.
S2, processing module judge whether output acoustic power is stable；
Preferably, S2 includes: that the measuring accuracy of radiant force balance is at least thousand quartiles；Processing module judges adjacent moment
Whether the part before thousand quartiles of received output acoustic power is identical, and if they are the same, then output acoustic power is stablized, otherwise output sound
Power is unstable.
The variation of the received output acoustic power of adjacent moment is judged by the part before judging thousand quartiles, if thousand quartiles it
Preceding part is identical, then changes smaller, output acoustic power stabilization；If it is different, then changing greatly, output acoustic power is unstable.It can
With understanding, if output acoustic power is unstable, repeatedly S1 continues to measurement data, until output acoustic power stablize again into
Row processing, thus avoid because output acoustic power it is unstable caused by measure inaccuracy.
It is further preferred that judging unit after judging that output acoustic power is stablized, also judges that receiving unit institute is received
Whether measurement data corresponds in time, when not to it is corresponding when continue to measurement data, until the received measurement data of institute when
Between on to it is corresponding when handle again, to guarantee the accuracy of measurement.
S3, when output acoustic power is stablized, processing module calculates electroacoustic according to input electric power and output acoustic power and converts
Efficiency.
Specifically, computing unit carries out deconsolidation process to the forward and backward electrical power that electrodymamometer obtains, by serial data
It is converted into character string, two character strings is split as with function is split, the character string after fractionation is then converted into double essences
The two-dimensional array of degree is saved, and after being extracted one by one using index function, is carried out numerical value calculating, is obtained electro-acoustic conversion efficiency.
Preferably, electro-acoustic conversion efficiency measurement method further include: S4, processing module are saved and shown super by XY figure control
The electro-acoustic conversion efficiency of sonic transducer.
Specifically, display unit uses XY figure control, flexibly change the X that waveform shows by bundling function, Y variable, together
When alternative condition structure, show using Boolean variable dynamic control waveform, XY figure control node is called to realize the preservation of waveform, it is aobvious
Show that interface is as shown in Figure 4.
Based on electro-acoustic conversion efficiency measurement method provided in this embodiment, the ultrasonic transduction of the device measuring in table 1 is chosen
Electro-acoustic conversion efficiency of the device under different frequency and driving power, by stabilization of the coefficient of variation to system for calculating measurement result
Property analyzed, and compared with manual testing's method, the results showed that this test macro has preferable accuracy, and single
Testing time shortens 5 times or more.Wherein, when driving power is respectively 10W, 20W and 30W, the present embodiment is provided
Ultrasonic measurement devices method (coefficient of variation is respectively 4.06%, 4.31%, 4.65%) survey that (coefficient of variation is respectively than artificial
4.14%, 4.69%, 5.83%) more stable, meet test macro application demand.
1 electro-acoustic conversion efficiency measuring device of table
Electro-acoustic conversion efficiency measurement method provided in this embodiment by processing module to input electric power measurement module and
The measurement data of radiant force balance such as is judged, is calculated at the processing, to obtain the electro-acoustic conversion efficiency of ultrasonic transducer.Pass through
The electro-acoustic conversion efficiency measuring device measure ultrasonic transducer electro-acoustic conversion efficiency, compared to the prior art in artificial survey
Amount, can the stability more quickly to measured acoustical power judge, to reduce the attachment of absorbing target blibbing
The temperature rise rate of probability and de aerated water, and then improve the accuracy of measurement and the stability of measuring system.Meanwhile electroacoustic conversion effect
Serial communication is used in rate measuring device, avoids the interference of electromagnetic signal.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a kind of electro-acoustic conversion efficiency measuring device for ultrasonic transducer, including the input electricity for measuring ultrasonic transducer
The radiant force balance of the input electric power measurement module of power and the output acoustic power for measuring ultrasonic transducer, feature exist
In the electro-acoustic conversion efficiency measuring device further includes processing module, and the processing module includes:
For receiving the receiving unit of the input electric power and output acoustic power；
For judging the whether stable judging unit of the output acoustic power；
For calculating electro-acoustic conversion efficiency according to the input electric power and output acoustic power when the output acoustic power is stablized
Computing unit.
2. electro-acoustic conversion efficiency measuring device according to claim 1, which is characterized in that
The judging unit be specifically used for the part before the pre-determined bit for judging the received output acoustic power of adjacent moment whether phase
Together, if they are the same, then the output acoustic power is stablized, and otherwise the output acoustic power is unstable.
3. electro-acoustic conversion efficiency measuring device according to claim 2, which is characterized in that
The measurement accuracy of the radiant force balance is at least thousand quartiles；
The pre-determined bit is thousand quartiles.
4. electro-acoustic conversion efficiency measuring device according to claim 1, which is characterized in that
It is connected between the processing module and the input electric power measurement module and radiant force balance by serial communication.
5. electro-acoustic conversion efficiency measuring device according to claim 1, which is characterized in that the processing module further include:
Control unit works under different frequency and driving power for controlling the ultrasonic transducer.
6. electro-acoustic conversion efficiency measuring device according to claim 1, which is characterized in that the processing module further include:
Display unit, for being saved by XY figure control and showing the electro-acoustic conversion efficiency of the ultrasonic transducer.
7. electro-acoustic conversion efficiency measuring device according to claim 1, which is characterized in that the input electric power measures mould
Block includes:
Directional coupler, for will be used to drive the electrical power driving signal of ultrasonic transducer to be applied to ultrasonic transducer；
Electrodymamometer, for measuring the input electric power of ultrasonic transducer according to the coupled voltages of the directional coupler.
8. a kind of electro-acoustic conversion efficiency measurement method for ultrasonic transducer characterized by comprising
Processing module receives the input electric power of the ultrasonic transducer of input electric power measurement module measurement and radiant force balance is surveyed
The output acoustic power of the ultrasonic transducer of amount；
Processing module judges whether the output acoustic power is stable；
When the output acoustic power is stablized, processing module calculates electroacoustic according to the input electric power and output acoustic power and converts
Efficiency.
9. electro-acoustic conversion efficiency measurement method according to claim 8, which is characterized in that described in the processing module judgement
Whether output acoustic power is stable to include:
The measuring accuracy of the radiant force balance is at least thousand quartiles；
Whether the part before processing module judges thousand quartiles of the received output acoustic power of adjacent moment is identical, if phase
Together, then the output acoustic power is stablized, and otherwise the output acoustic power is unstable.
10. electro-acoustic conversion efficiency measurement method according to claim 8, which is characterized in that the processing module receives defeated
Enter ultrasonic transducer measured by the input electric power and radiant force balance of ultrasonic transducer measured by electric power measurement module
Output acoustic power before, further includes:
Processing module control ultrasonic transducer works under different frequency and driving power.
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