CN110243460A - A kind of measuring device and method of ultrasonic sound field - Google Patents
A kind of measuring device and method of ultrasonic sound field Download PDFInfo
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- CN110243460A CN110243460A CN201910407129.7A CN201910407129A CN110243460A CN 110243460 A CN110243460 A CN 110243460A CN 201910407129 A CN201910407129 A CN 201910407129A CN 110243460 A CN110243460 A CN 110243460A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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Abstract
The invention discloses a kind of measuring device of ultrasonic sound field and methods, the device includes data processing module, rack (5), the electric rotating cabinet (7) being arranged on rack (5) and fixation device (6), linear reciprocating mechanism on fixed device (6), and the probe plate (3) being arranged on linear reciprocating mechanism are set；This method controls the acquisition that two motor movements realize sound field by FPGA, while FPGA acquires sound field information by probe plate, and last computer is saved to the data of acquisition and post-processing, ultrasonic sound field visualization is carried out, to realize the measurement of ultrasonic sound field.The present invention passes through design novel ultrasonic measuring device and method using the ultrasonic sound field in air as object, it may be convenient to measure sound field parameters and realize sound field visualization.
Description
Technical field
The invention belongs to acoustic metrology fields, and in particular to a kind of measuring device and method of ultrasonic sound field.
Background technique
Ultrasonic phased array transducer, which refers to, forms array by multiple independent piezoelectric chips, uses by certain rule and timing
Electronic control system control excites each wafer cell, to control to adjust the position of focus and the direction of focusing.
In conventional ultrasound acoustic field, the problems such as Vltrasonic device is larger and complicated for operation there are volume is measured.And surpass
The application fields such as sound focusing, ultrasound suspending are also more and more, and restrict its development always for sound field detection；In existing sound
In field measurement, measurement range is relatively fixed.
Summary of the invention
The purpose of the present invention is to provide a kind of measuring device of ultrasonic sound field and method, devise ultrasonic device for measuring from
And the parameters such as ultrasonic sound field acoustic pressure, the sound intensity are easily measured, the acquisition that two motor movements realize sound field is controlled by FPGA,
FPGA acquires sound field information by probe plate simultaneously, and last computer is saved to the data of acquisition and post-processing, carries out ultrasound
Sound field visualization, to realize the measurement of ultrasonic sound field.
The present invention adopts the following technical scheme that realize:
A kind of measuring device of ultrasonic sound field, including data processing module, rack, the electric rotating cabinet being arranged on the rack
(7) and device is fixed, linear reciprocating mechanism on the securing means is set, and is arranged on linear reciprocating mechanism
Probe plate；Wherein,
The output end of electric rotating cabinet is connected with fixed device, for driving fixed device to rotate；It is provided on probe plate
Several probes, for acquiring the sound pressure information of the multiple points of same plane in space simultaneously；
Data processing module is acted for controlling linear reciprocating mechanism and electric rotating cabinet, and to the sky of probe acquisition
Between the sound pressure informations of the middle multiple points of same plane handled, obtain acoustic pressure electric signal, acoustic pressure electric signal passes through operational amplifier
Amplification enters serial analog-to-digital conversion module, its analog signal is converted to digital signal by serial analog-to-digital conversion module, FPGA by its
Digital signal is stored in SDRAM memory, and FPGA sends storage digital quantity to PC by serial communication.
A further improvement of the present invention lies in that offer sliding slot on fixed device, linear reciprocating mechanism include sliding block,
Lead screw, the linear motion motor housing that the fixed case and the other end of one end in sliding slot are set, fixed case and linear motion motor
It is connected between case by fixed link disposed in parallel, lead screw is arranged between two fixed links, the output for the motor housing that moves along a straight line
End is connect with one end of lead screw, and the other end of lead screw is flexibly connected with fixed case, sliding block across two fixed links and lead screw, and with
Threads of lead screw connection, probe plate are arranged on sliding block.
A further improvement of the present invention lies in that the output end for the motor housing that moves along a straight line is connected by one end of shaft coupling and lead screw
It connects.
A further improvement of the present invention lies in that fixed case is provided with limit sensors.
A further improvement of the present invention lies in that data processing module includes PC, FPGA, operational amplifier and serial modulus
Conversion module, FPGA are separately connected rotary motion motor, linear motion motor, probe and limit sensors, PC by signal wire
It is communicated by UART serial port protocol with FPGA, FPGA is connect with signal wire respectively with SDRAM, transport amplifier, and operation is put
Big device and ADS8344 are connected with signal wire.
A kind of measurement method of ultrasonic sound field, this method is based on a kind of above-mentioned ultrasonic sound field measuring device, including walks as follows
Suddenly,
Step 1, it is programmed by FPGA, control linear motion motor returns to zero, i.e., Z axis is zeroed；
Step 2, programming realizes the motion profile of control probe plate, it can be achieved that rotation and linear motion；
Step 3, the ultrasonic vibration in air can be made pottery by piezoelectricity using ultrasound signal receipt device as data receiver
The piezoelectric effect of porcelain is converted into voltage signal from mechanical energy, uses operational amplifier modulated analog signal；
Step 4, analog-to-digital conversion is realized using serial modulus conversion chip ADS8344, acquires simulation using phased array mode
Signal, acquisition signal are stored in the SDRAM memory of FPGA；
Step 5, by primary complete acquisition, host computer is sent to by serial ports, realizes sound field visualization.
The present invention has following beneficial technical effect:
The present invention passes through design novel ultrasonic measuring device and method, Ke Yifang using the ultrasonic sound field in air as object
Just measure sound field parameters and realize sound field visualization.It has the following advantages that,
First: ultrasonic device for measuring is moved using FPGA control probe plate, and accurate position control may be implemented, thus real
Now accurately measure ultrasonic sound field；
The rotation of second: FPGA control rotating electric machine, easily measures the changing rule of 360 degree of arbitrary line sound fields；
Further, parallel duplex data are easily achieved using FPGA and serial modulus conversion chip to acquire；
Further, rapid survey is easily achieved using FPGA control movement.
Third: probe plate can realize measurement range variation by installing the ultrasonic receiver of different number；
Third: for conplane ultrasonic measurement, since the systematic error that probe plate introduces is identical, convenient at data
Reason；
4th: device 2 is detachable, is acquired by the sound field that different directions may be implemented in different placement positions, measures model
It encloses greatly, can also realize that hand-held measures.
5th: structure is simple, is readily disassembled.
Detailed description of the invention
Fig. 1 is ultrasonic sound field measuring device general assembly drawing.
Fig. 2 is ultrasonic sound field measuring device explosive view.
Fig. 3 is detachable apparatus.
Fig. 4 is ADS8344 serial line interface timing.
Fig. 5 is data processing module figure.
Description of symbols:
1- fixed case, 2- sliding block, 3- probe plate, 4- linear motion motor housing, 5- rack, the fixed device of 6-, 7- electric rotating
Cabinet, 8- limit sensors, 9- lead screw, 10- fixed link, 11- shaft coupling.
Specific embodiment
The present invention is made further instructions below in conjunction with attached drawing.
The measuring device and method of a kind of ultrasonic sound field provided by the invention devise ultrasonic device for measuring to convenient
The parameters such as ultrasonic sound field acoustic pressure, the sound intensity are measured, the acquisition that two motor movements realize sound field, while FPGA are controlled by FPGA
Sound field information is acquired by probe plate, last computer is saved to the data of acquisition and post-processing, and it is visual to carry out ultrasonic sound field
Change, to realize the measurement of ultrasonic sound field.
As shown in Figures 1 to 5, the measuring device of ultrasonic sound field provided by the invention, including the following contents:
Measuring device of the present invention is achieved in that fixed case 1, sliding block 2, probe plate 3, linear motion motor housing 4, rack
5, fixed device 6, electric rotating cabinet 7, limit sensors 8, lead screw 9, fixed link 10 and shaft coupling 11；This device uses multiple spies
Head is fixed on probe plate, while acquiring the sound pressure information of the multiple points of same plane in space；Probe plate is fixed by screws in cunning
On block；Sliding block is fixed on lead screw and guide rail；Motor shaft is connect by shaft coupling with lead screw in motor housing, and shaft coupling passes through jackscrew
Fixed lead screw and motor shaft；Limit switch is housed on fixed case, is connected through a screw thread and is fixed on fixed case；The motor of device 2
Case is threadedly coupled fixed device by two sides with fixed case, and entire part is connect by shaft coupling with rack；FPGA passes through signal
Line is separately connected rotary motion motor, and (wherein signal wire passes through sliding block and fixation for linear motion motor, probe plate and limit switch
Frame is drawn).
Mobile device passes through the servo motor being arranged in motor housing, lead screw, sliding block and support rod and realizes locomotive function,
Wherein support rod plays fixed function.The linear motion motor is fixed in motor housing using threaded connection, FPGA output module
It can control motor housing, motor housing connects lead screw and two fixed brackets by shaft coupling, and sliding block can be by lead screw and admittedly
Linear motion is realized on fixed rack.In automatic control, sliding block is first moved to limit switch, then starts to acquire data.
The servo motor 2 is connected through a screw thread in fixed and rack, and it is whole that device 2 may be implemented in the movement of servo motor 2
The rotary motion of body, rotary motion adjusts cabinet and linear motion adjusts cabinet side and is provided with data line vias.
As shown in figure 5, data processing module includes PC, FPGA, operational amplifier and serial analog-to-digital conversion module, FPGA
It is separately connected rotary motion motor, linear motion motor, probe and limit sensors (8) by signal wire, PC is gone here and there by UART
Mouthful agreement is communicated with FPGA, and FPGA is connect with signal wire respectively with SDRAM, transport amplifier, operational amplifier and
ADS8344 is connected with signal wire.
A kind of measurement method of ultrasonic sound field provided by the invention, comprising the following steps:
1) input signal is modulated, and using ultrasound signal receipt device as data receiver, the ultrasound in air can be shaken
The dynamic piezoelectric effect by piezoelectric ceramics, is converted into voltage signal from mechanical energy.Ultrasonic receiver (probe plate probe) receives width
It is worth up to 60vpp.Since the A/D chip of use is using Vcc=2.7V~+5V power supply, analog signal inputs piezoelectricity should be 0
In~Vcc range, and input analog voltage signal is bipolarity.Use ± 30V operational amplifier of the present invention is to analog signal
It is modulated, bipolar analog voltage signal is changed into unipolarity conversion signal, and transmission function is linear function, as long as just
Really select accurate resistance value, -30~+30V voltage signal can linear transformation be 0~+5V, to ensure that precision.
2) serial modulus conversion chip ADS8344, ADS8344 are the ADC of a high-performance, low-power consumption, maximum sampling frequency
Rate is 100kH z, carries sample/hold circuit, includes 8 single-ended analog input channels (CH0~CH7).ADS8344 passes through
DIN, DOUT, CS, BUSY, CLK interface and FPGA are in communication with each other, and data are input to 8 write control registers from DIN pin.
When FPGA has read ADC last time transformation result, the control byte of next ALT-CH alternate channel has just write DIN pin.One complete
Whole control byte needs 8 CLK clocks.While writing control byte, analog/digital conversion terminates, analog/digital conversion state output
Pin BUSY generates a failing edge, and effectively, FPGA starts to receive the transformation result exported by DOUT for data output.16 bit string line numbers
According to 16 CLK clocks are needed, when receiving the LSB bit of serial data, the control word in next channel starts to be input to A/D core
Piece.ADS8344 completes primary complete data sampling holding, conversion and output and needs 25 CLK clocks altogether.ADS8344 is serial
Interface sequence is as shown in Figure 4.
3) FPGA control and data processing, acquire acoustic field signal using phase battle array mode, therefore analog signal input channel is very
It is more, in order to guarantee signal acquisition precision, using FPGA (field programmable gate array).There are trigger and I/ abundant inside FPGA
There is up to 128 or more general purpose Is/O pin, each I/O pin can input and output using EP4CE10 series in O pin
Data.All ADS8344 share a FPGA clock signal, guarantee timing synchronization, therefore in addition individually control an ADS8344
Tetra- pin interfaces of DIN, DOUT, CS, BUSY are then needed, i.e., can at least control 256 ultrasound signal receipt devices simultaneously.
It is stored in the SDRAM memory of FPGA by collected data, after primary complete acquisition, passes through string
Mouth is sent to PC host computer and carries out further data processing.
4) sound field is drawn, and upper computer software function is relatively simple, mainly will be carried out three-dimensional from the received data of FPGA and be drawn
Figure.Using the powerful drawing function of matlab, carries out programming and write GUI, form interface.Believed using 256 ultrasonic waves
Number receiver defines the sequence notation of 0-256, and ultrasound signal receipt device uses 10mm diameter, with honeycomb hexagonal array,
XY coordinate value away from tolerance 1mm, therefore each ultrasound signal receipt device determines that can customize Z axis initial position is 0,
Further according to each amount of movement of servo motor, it is cumulative that Z axis coordinate does same amount of movement adjustment.Will from the received 256 groups of data of FPGA according to
The sequence notation assignment of the secondary 0-256 according to ultrasound signal receipt device can carry out three-dimensional sound field drafting.
Claims (6)
1. a kind of measuring device of ultrasonic sound field, which is characterized in that including data processing module, rack (5) is arranged in rack
(5) electric rotating cabinet (7) and fixed device (6), linear reciprocating mechanism of the setting on fixed device (6) on, and
Probe plate (3) on linear reciprocating mechanism is set；Wherein,
The output end of electric rotating cabinet (7) is connected with fixed device (6), for driving fixed device (6) to rotate；It pops one's head in plate (3)
On be provided with several probes, for acquiring the sound pressure informations of the multiple points of same plane in space simultaneously；
Data processing module is acted for controlling linear reciprocating mechanism and electric rotating cabinet (7), and to the sky of probe acquisition
Between the sound pressure informations of the middle multiple points of same plane handled, obtain acoustic pressure electric signal, acoustic pressure electric signal passes through operational amplifier
Amplification enters serial analog-to-digital conversion module, its analog signal is converted to digital signal by serial analog-to-digital conversion module, FPGA by its
Digital signal is stored in SDRAM memory, and FPGA sends storage digital quantity to PC by serial communication.
2. a kind of ultrasonic sound field measuring device according to claim 1, which is characterized in that offered on fixed device (6)
Sliding slot, linear reciprocating mechanism include sliding block (2), lead screw (9), the fixed case (1) that one end in sliding slot is arranged in and another
The linear motion motor housing (4) at end passes through fixed link disposed in parallel between fixed case (1) and linear motion motor housing (4)
(10) it connects, lead screw (9) is arranged between two fixed links (10), output end and lead screw (9) of linear motion motor housing (4)
One end connection, the other end of lead screw (9) are flexibly connected with fixed case (1), and sliding block (2) passes through two fixed links (10) and lead screw
(9), it and with lead screw (9) is threadedly coupled, probe plate (3) is arranged on sliding block (2).
3. a kind of ultrasonic sound field measuring device according to claim 2, which is characterized in that linear motion motor housing (4)
Output end is connect by shaft coupling (11) with one end of lead screw (9).
4. a kind of ultrasonic sound field measuring device according to claim 2, which is characterized in that fixed case (1) is provided with limit
Sensor (8).
5. a kind of ultrasonic sound field measuring device according to claim 4, which is characterized in that data processing module include PC,
FPGA, operational amplifier and serial analog-to-digital conversion module, FPGA are separately connected rotary motion motor, straight line fortune by signal wire
Dynamic motor, probe and limit sensors (8), PC are communicated by UART serial port protocol with FPGA, FPGA and SDRAM, are transported
Amplifier is connected with signal wire respectively, and operational amplifier and ADS8344 are connected with signal wire.
6. a kind of measurement method of ultrasonic sound field, which is characterized in that this method is based on described in any one of claim 2 to 5
A kind of ultrasonic sound field measuring device, includes the following steps,
Step 1, it is programmed by FPGA, control linear motion motor returns to zero, i.e., Z axis is zeroed；
Step 2, programming realizes the motion profile of control probe plate, it can be achieved that rotation and linear motion；
It step 3, can be by the ultrasonic vibration in air by piezoelectric ceramics using ultrasound signal receipt device as data receiver
Piezoelectric effect is converted into voltage signal from mechanical energy, uses operational amplifier modulated analog signal；
Step 4, analog-to-digital conversion is realized using serial modulus conversion chip ADS8344, acquires analog signal using phased array mode,
Acquisition signal is stored in the SDRAM memory of FPGA；
Step 5, by primary complete acquisition, host computer is sent to by serial ports, realizes sound field visualization.
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