CN109884185A - Take turns shaft detection special-purpose ultrasonic head angle Auto-Test System and test method - Google Patents
Take turns shaft detection special-purpose ultrasonic head angle Auto-Test System and test method Download PDFInfo
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- CN109884185A CN109884185A CN201910182707.1A CN201910182707A CN109884185A CN 109884185 A CN109884185 A CN 109884185A CN 201910182707 A CN201910182707 A CN 201910182707A CN 109884185 A CN109884185 A CN 109884185A
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Abstract
The invention discloses a kind of wheel shaft detection special-purpose ultrasonic head angle Auto-Test Systems, include FPGA module, ultrasound emission module, ultrasonic reception module, signal conditioning module, AD sampling module、Position of strobe control module, gate widths control module, MCU module and human-machine interface module；Ultrasound emission module and probe connect, ultrasonic reception module and probe connect, signal conditioning module is connect with ultrasonic reception module, AD sampling module is connect with signal conditioning module, FPGA module is connect with ultrasound emission module and AD sampling module, position of strobe control module is connected with gate widths control module respectively at FPGA module, and MCU module is connect with FPGA module, and human-machine interface module is connect with MCU module.Test result accuracy of the present invention is high, reduces influence of the human factor to test data.
Description
Technical field
The present invention relates to a kind of head angle Auto-Test System and test method, especially a kind of wheel shaft detection is dedicated super
Sonic probe angle Auto-Test System and test method.
Background technique
Important component of the railway transportation as national economy, safety of railway traffic are most important.Periodically to truck wheel
Axis carries out being detected as guaranteeing that railway operation safety plays an important role.Ultrasonic examination has high sensitivity, wears that turn of speed is strong, acoustic beam
Main method of the advantages that directive property is good, defect detection rate is high and harmless as railway wheel shaft detection.Ultrasonic probe is made
It is the important component of entire detection system for ultrasonic wave transmitting and echo reception device.The quality of its performance directly affects
Ultrasonic examination it is accurate whether, be the key that guarantee flaw detection one of quality.It pops one's head in use, since chip is worn
Head angle is caused to change.User continues to use without knowing it, be easy to cause to defect location inaccuracy
It causes to judge by accident.Therefore daily verification is carried out before detecting a flaw, the angle and zero point of measuring probe guarantee the accuracy of result of detection.
When shaft end detects axle journal root defect, probe moving range suffers restraints, and generally uses small angle longitudinal wave probe
To detect a flaw.When test angle, tester needs a hand to hold probe after finding TZS-R test block corner angle highest echo, another
Hand measurement probe to test block front end distance, it is extremely inconvenient since the presence of coupling liquid leads to easy movement of popping one's head in while single
Hand measurement data inaccuracy, bigger error.The data of measurement also need record and calculate, cause test a probe time compared with
Long, working efficiency is low.
When wheel detection, in order to fit closely probe with wheel tread, angle probe contact surface generally has certain curvature
Curved surface.Conveyor examines [2000] No. 335 text regulations: detecting R100 arc surface in LG-R test block, is moved forward and backward and pops one's head in and protect
It is parallel with test block side to hold probe, until R100 arc surface back wave reaches highest, then at this time corresponding to the R100 cambered surface center of circle
Probe positions are the incidence point popped one's head in.According to the size of head angle, detect in LG-R test block in depth 20rm or 30rmHorizontal through-hole is moved forward and backward and pops one's head in and keep probe parallel with test block side, until horizontal through-hole back wave highest is visited at this time
Scale value in test block corresponding to head incidence point is the refraction angle popped one's head in.
Since the operation technique of tester is different, the incidence point of mark is not allowed the angle value for leading to test inaccurate, and one
Cause property is poor.And it is inconvenient for operation, the testing time is longer, and large labor intensity, testing efficiency is low, and artifical influence factor is bigger.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of wheel shaft detection special-purpose ultrasonic head angles to test automatically
System and test method, test result accuracy is high, reduces influence of the human factor to test data.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of wheel shaft detection special-purpose ultrasonic head angle Auto-Test System, it is characterised in that: comprising FPGA module, surpass
Sound emission module, ultrasonic reception module, signal conditioning module, AD sampling module, position of strobe control module, gate widths control
Module, MCU module and human-machine interface module；
Ultrasound emission module and probe connection are used for the transmitting of ultrasonic wave；
Ultrasonic reception module and probe connection are for receiving ultrasonic echo；
Signal conditioning module is connect for amplifying received ultrasonic echo with ultrasonic reception module；
AD sampling module is connect with signal conditioning module for converting analog signals into digital signal；
FPGA module connect with ultrasound emission module and AD sampling module for data sampling, the lookup of most value, data buffering,
Data compression and data storage control；
Position of strobe control module and gate widths control module respectively at FPGA module connect for in FPGA module
The most value searching module in portion works index of the determining highest echo in sampling point sequence together, thus determines transmission time；
MCU module is connect with FPGA module for controlling whole system；
Human-machine interface module is connect for carrying out human-computer dialogue with MCU module, checks waveform, parameter, button operation is arranged.
Further, the human-machine interface module includes keyboard and display.
It is a kind of take turns shaft detection special-purpose ultrasonic head angle Auto-Test System test method, it is characterised in that comprising with
Lower step:
Step 1: system parameter is arranged by human-machine interface module in user, completes circuit initialization；
Step 2: the test of low-angle head angle is carried out；
Probe is placed in the face TZ-R test block B and calculates automatically when corner angle echo highest under the face A in gate by acknowledgement key system
And record current time numerical value；
Probe is placed in the face TZ-R test block B and calculates automatically when corner angle echo highest on the face A in gate by acknowledgement key system
Probe zero point；
Step 3: angle probe angle measurement is carried out；
Probe is placed in detection R100 arc surface in LG-R test block, is moved forward and backward and pops one's head in and keep probe flat with test block side
Row is calculated probe zero point by acknowledgement key system until R100 arc surface back wave reaches highest automatically；Probe is placed in wheel pedal
Face, in gate when hole echo highest, by acknowledgement key, system calculates angle value automatically and shows result.
Further, after the step 1 is specially system electrification, system parameter is arranged by human-machine interface module in user,
And passed in MCU control module by communication interface, parameter is transferred to FPGA module and completes the initial of circuit by MCU control module
Change.
Further, the system parameter includes gate widths, position of strobe, velocity of sound C, sampling sound path and sampling in test block
Point compression ratio.
Further, in the step 2,
When low-angle incidence angle is at 9 ° -12 °, system program calculates angle value automatically and shows result；
When low-angle incidence angle is at 6 ° -8 °, probe is placed in the face TZ-R test block C, in gate on the face A when corner angle echo highest
By acknowledgement key, system program calculates angle value automatically and shows result.
Further, the detailed process of the echo highest confirmation is
After starting sampling, counter is started to work and is counted from zero, and one Counter Value of every sampling adds 1；
From position of strobe time beginning, each time the current value after AD conversion can all be sent to comparator a [7:
0] it holds compared with the data that b [7:0] is held carry out size；B [7:0] end data is provided by the output end of most value register, and most value is posted
Retain the maximum value acquired within the scope of gate widths in storage；
Control of the loading procedure of most value register by signal Signal1 in system；Signal Signal1 is greater than for comparator
Output signal, indicates the value that AD digital signal amount currently entered is greater than in most value register, which will make most value buffer
Current new value is loaded into most value register, numerical value in most value register is updated；
Most value indexed registers loading procedure is controlled by signal Signal2, indicates that AD digital signal amount currently entered is big
In the value in most value register, which, which is loaded into counter current value, is most worth in indexed registers, updates most value index deposit
The value of device；
After the gate widths time, counter and comparator stop working；System, which obtains, to be most worth in indexed registers
The sample frequency of value MaxIndex, the as position of maximum amplitude, AD sampling module are 100MHz/8bit, are adopted at interval of 10ns
One point of sample, ultrasonic wave reach the transmission time of defect from transmitting are as follows: 10 × MaxIndex/1000 μ s is saved in memory
It is used for calculating；
After echo wave signal acquisition is complete, the data after the sampling of AD sampling module are compressed and are stored by FPGA module
In fifo buffer, is finally read and sent to display by MCU module and show.When highest echo occurs in screen, MCU module is obtained
User is taken in human-machine interface module to provide order of accepting one's fate really by keyboard, caller calculates angle value automatically.
Further, the step 2 low-angle head angle test detailed process is
Probe is placed in the face TZ-R test block B, under the face A when corner angle echo highest, is from the corner angle propagation time under the face A is emitted to
t1；
Probe is placed in the face TZ-R test block B, on the face A when corner angle echo highest, is from the corner angle propagation time on the face A is emitted to
t2；
Obtain time T=2 × t that ultrasonic wave transmits in probe chip1-t2；
When low-angle incidence angle is at 9 ° -12 °, formula is obtained
When low-angle incidence angle is at 6 ° -8 °, probe is placed in the face TZ-R test block C, on the face A when corner angle echo highest, from hair
Being mapped to the corner angle propagation time on the face A is t3, obtain formula
Wherein: θ is probe refraction angle, and C is ultrasonic wave in test block acoustic speed of propagation.
Further, the step 3 angle probe angle measurement detailed process is
Probe is placed in detection R100 arc surface in LG-R test block, is moved forward and backward and pops one's head in and keep probe flat with test block side
Row, until R100 arc surface back wave reaches highest, it is t from the arc surface time is emitted to4；
The time T=t that ultrasonic wave transmits in probe chip4-100/C×1000；
Probe is placed in wheel tread, and ultrasonic wave, which encounters hole, can generate echo, at this time from when being emitted to hole transmission
Between be t5；
If radius of wheel is R, artificial aperture is r, and probe refraction angle is θ, and ultrasonic wave velocity of sound in workpiece is C, is established such as
Lower mathematical model in the triangle OAB that wheel center point O and artificial central point of hole B are constituted, is determined by Probe index A by cosine
Reason obtains AO2+AB2- 2 × AB × AO × cos θ=BO2,
Acquire θ=arccos ((AO2+AB2-BO2)/(2×AB×AO))
Wherein, θ is probe refraction angle, and C is ultrasonic wave in test block acoustic speed of propagation, AO=R, AB=C × (t5-T)/1000+
R, BO=R- (h+r).
Compared with prior art, the present invention having the following advantages that and effect: operation of the present invention is simple, the testing time is short, surveys
Test result accuracy is high, reduces influence of the human factor to test data；The testing time has been saved, work effect is substantially increased
Rate；Tester only need to be in strict accordance with testing procedure, system program just automatic calculated result.
Detailed description of the invention
Fig. 1 is the schematic diagram of wheel shaft detection special-purpose ultrasonic head angle Auto-Test System of the invention.
Schematic diagram when Fig. 2 is the test of the face test block B the embodiment of the present invention TZ-R under the face A when corner angle echo highest.
Schematic diagram when Fig. 3 is the test of the face test block B the embodiment of the present invention TZ-R on the face A when corner angle echo highest.
Schematic diagram when Fig. 4 is the test of the face test block C the embodiment of the present invention TZ-R on the face A when corner angle echo highest.
Fig. 5 is the angle probe angle measurement schematic diagram of the embodiment of the present invention.
Fig. 6 is the echo highest confirmation signal flow chart of the embodiment of the present invention.
Specific embodiment
Below by embodiment, the present invention is described in further detail, following embodiment be explanation of the invention and
The invention is not limited to following embodiments.
As shown in Figure 1, a kind of wheel shaft detection special-purpose ultrasonic head angle Auto-Test System of the invention, includes FPGA
Module, ultrasound emission module, ultrasonic reception module, signal conditioning module, AD sampling module, position of strobe control module, gate
Width control module, MCU module and human-machine interface module.
Ultrasound emission module and probe connection are used for the transmitting of ultrasonic wave；
Ultrasonic reception module and probe connection are for receiving ultrasonic echo；
Signal conditioning module is connect for amplifying received ultrasonic echo with ultrasonic reception module；
AD sampling module is connect with signal conditioning module for converting analog signals into digital signal；
FPGA module connect with ultrasound emission module and AD sampling module for data sampling, the lookup of most value, data buffering,
Data compression and data storage control；
Position of strobe control module and gate widths control module respectively at FPGA module connect for in FPGA module
The most value searching module in portion works index of the determining highest echo in sampling point sequence together, thus determines transmission time；
MCU module is connect with FPGA module for controlling whole system；
Human-machine interface module is connect for carrying out human-computer dialogue with MCU module, checks waveform, parameter, button operation is arranged.
Human-machine interface module includes keyboard and display.
After system electrification initialization, MCU module, which is controlled FPGA module and sent with certain frequency to ultrasound emission module, to swash
Signal, ultrasound emission module drive energy converter are encouraged, the electric signal received is converted to mechanical energy by ultrasonic transducer, is issued super
Acoustic signals.Coupled dose of ultrasonic signal enters inside workpiece after artificial defect, the echo that ultrasonic probe will receive
Signal is converted to electric energy production voltage signal, after ultrasonic reception module, signal conditioning module amplification conditioning, FPGA module control
AD sampling module processed carries out sampling and converts analog signals into digital signal.
A kind of test method for taking turns shaft detection special-purpose ultrasonic head angle Auto-Test System comprising the steps of:
Step 1: system parameter is arranged by human-machine interface module in user, and passes to MCU control module by communication interface
In, parameter is transferred to the initialization that FPGA module completes circuit by MCU control module.System parameter includes gate widths, gate
Velocity of sound C, sampling sound path and sampled point compression ratio in position, test block.
Step 2: the test of low-angle head angle is carried out；
Probe is placed in the face TZ-R test block B and calculates automatically when corner angle echo highest under the face A in gate by acknowledgement key system
And record current time numerical value；
Probe is placed in the face TZ-R test block B and calculates automatically when corner angle echo highest on the face A in gate by acknowledgement key system
Probe zero point；
When low-angle incidence angle is at 9 ° -12 °, system program calculates angle value automatically and shows result；
When low-angle incidence angle is at 6 ° -8 °, probe is placed in the face TZ-R test block C, in gate on the face A when corner angle echo highest
By acknowledgement key, system program calculates angle value automatically and shows result.
System low-angle head angle test program process are as follows:
Probe is placed in the face TZ-R test block B, under the face A when corner angle echo highest, is from the corner angle propagation time under the face A is emitted to
t1；
Probe is placed in the face TZ-R test block B, on the face A when corner angle echo highest, is from the corner angle propagation time on the face A is emitted to
t2；
Obtain time T=2 × t that ultrasonic wave transmits in probe chip1-t2；
When low-angle incidence angle is at 9 ° -12 °, formula is obtained
When low-angle incidence angle is at 6 ° -8 °, probe is placed in the face TZ-R test block C, on the face A when corner angle echo highest, from hair
Being mapped to the corner angle propagation time on the face A is t3, obtain formula
Wherein: θ is probe refraction angle, and C is ultrasonic wave in test block acoustic speed of propagation.
Step 3: angle probe angle measurement is carried out；
Probe is placed in detection R100 arc surface in LG-R test block, is moved forward and backward and pops one's head in and keep probe flat with test block side
Row is calculated probe zero point by acknowledgement key system until R100 arc surface back wave reaches highest automatically；Probe is placed in wheel pedal
Face, in gate when hole echo highest, by acknowledgement key, system is automatic according to finishing in advance and storing program in memory
It calculates angle value and shows result.
System angle probe angle measurement program process are as follows:
Probe is placed in detection R100 arc surface in LG-R test block, is moved forward and backward and pops one's head in and keep probe flat with test block side
Row, until R100 arc surface back wave reaches highest, it is t from the arc surface time is emitted to4；
The time T=t that ultrasonic wave transmits in probe chip4-100/C×1000；
Probe is placed in wheel tread, and ultrasonic wave, which encounters hole, can generate echo, at this time from when being emitted to hole transmission
Between be t5；
If radius of wheel is R, artificial aperture is r, and probe refraction angle is θ, and ultrasonic wave velocity of sound in workpiece is C, is established such as
Lower mathematical model in the triangle OAB that wheel center point O and artificial central point of hole B are constituted, is determined by Probe index A by cosine
Reason obtains AO2+AB2- 2 × AB × AO × cos θ=BO2,
Acquire θ=arccos ((AO2+AB2-BO2)/(2×AB×AO))
Wherein, θ is probe refraction angle, and C is ultrasonic wave in test block acoustic speed of propagation, AO=R, AB=C × (t5-T)/1000+
R, BO=R- (h+r).
In above procedure, the detailed process of echo highest confirmation is
As shown in fig. 6, counter is started to work and is counted from zero after starting sampling, one counter of every sampling
Value plus 1；
From position of strobe time beginning, each time the current value after AD conversion can all be sent to comparator a [7:
0] it holds compared with the data that b [7:0] is held carry out size；B [7:0] end data is provided by the output end of most value register, and most value is posted
Retain the maximum value acquired within the scope of gate widths in storage；
Control of the loading procedure of most value register by signal Signal1 in system；Signal Signal1 is greater than for comparator
Output signal, indicates the value that AD digital signal amount currently entered is greater than in most value register, which will make most value buffer
Current new value is loaded into most value register, numerical value in most value register is updated；
Most value indexed registers loading procedure is controlled by signal Signal2, indicates that AD digital signal amount currently entered is big
In the value in most value register, which, which is loaded into counter current value, is most worth in indexed registers, updates most value index deposit
The value of device；
After the gate widths time, counter and comparator stop working；System, which obtains, to be most worth in indexed registers
The sample frequency of value MaxIndex, the as position of maximum amplitude, AD sampling module are 100MHz/8bit, are adopted at interval of 10ns
One point of sample, ultrasonic wave reach the transmission time of defect from transmitting are as follows: 10 × MaxIndex/1000 μ s is saved in memory
It is used for calculating；
After echo wave signal acquisition is complete, the data after the sampling of AD sampling module are compressed and are stored by FPGA module
In fifo buffer, is finally read and sent to display by MCU module and show.When highest echo occurs in screen, MCU module is obtained
User is taken in human-machine interface module to provide order of accepting one's fate really by keyboard, caller calculates angle value automatically.
Operation of the present invention is simple, the testing time is short, test result accuracy is high, reduces human factor to the shadow of test data
It rings；The testing time has been saved, has been greatly improved work efficiency；Tester only need to be in strict accordance with testing procedure, and system program is just
Automatic calculated result.
Above content is only illustrations made for the present invention described in this specification.Technology belonging to the present invention
The technical staff in field can do various modifications or supplement or is substituted in a similar manner to described specific embodiment, only
It should belong to guarantor of the invention without departing from the content or beyond the scope defined by this claim of description of the invention
Protect range.
Claims (9)
1. a kind of wheel shaft detection special-purpose ultrasonic head angle Auto-Test System, it is characterised in that: include FPGA module, ultrasound
Transmitting module, ultrasonic reception module, signal conditioning module, AD sampling module, position of strobe control module, gate widths control mould
Block, MCU module and human-machine interface module；
Ultrasound emission module and probe connection are used for the transmitting of ultrasonic wave；
Ultrasonic reception module and probe connection are for receiving ultrasonic echo；
Signal conditioning module is connect for amplifying received ultrasonic echo with ultrasonic reception module；
AD sampling module is connect with signal conditioning module for converting analog signals into digital signal；
FPGA module is connect for data sampling, the lookup of most value, data buffering, data with ultrasound emission module and AD sampling module
Compression and data storage control；
Position of strobe control module and gate widths control module respectively at FPGA module connect for inside FPGA module
Most value searching module works the index of determining highest echo in sampling point sequence together, thus determines transmission time；
MCU module is connect with FPGA module for controlling whole system；
Human-machine interface module is connect for carrying out human-computer dialogue with MCU module, checks waveform, parameter, button operation is arranged.
2. a kind of wheel shaft detection special-purpose ultrasonic head angle Auto-Test System described in accordance with the claim 1, feature exist
In: the human-machine interface module includes keyboard and display.
3. a kind of test method of wheel shaft detection special-purpose ultrasonic head angle Auto-Test System of any of claims 1 or 2,
It is characterized in that comprising the steps of:
Step 1: system parameter is arranged by human-machine interface module in user, completes circuit initialization；
Step 2: the test of low-angle head angle is carried out；
Probe is placed in the face TZ-R test block B, when corner angle echo highest under the face A in gate, is calculated and is remembered automatically by acknowledgement key system
Record current time numerical value；
Probe is placed in the face TZ-R test block B, when corner angle echo highest on the face A in gate, calculates probe automatically by acknowledgement key system
Zero point；
Step 3: angle probe angle measurement is carried out；
Probe is placed in detection R100 arc surface in LG-R test block, is moved forward and backward and pops one's head in and keep probe parallel with test block side, directly
Reach highest to R100 arc surface back wave, calculates probe zero point automatically by acknowledgement key system；Probe is placed in wheel tread, lock
In door when hole echo highest, by acknowledgement key, system calculates angle value automatically and shows result.
4. test method described in accordance with the claim 3, it is characterised in that: the step 1 is specially user after system electrification
System parameter is set by human-machine interface module, and is passed in MCU control module by communication interface, MCU control module is by parameter
It is transferred to the initialization that FPGA module completes circuit.
5. test method according to claim 4, it is characterised in that: the system parameter includes gate widths, gate position
It sets, velocity of sound C, sampling sound path and sampled point compression ratio in test block.
6. test method described in accordance with the claim 3, it is characterised in that: in the step 2,
When low-angle incidence angle is at 9 ° -12 °, system program calculates angle value automatically and shows result；
When low-angle incidence angle is at 6 ° -8 °, probe is placed in the face TZ-R test block C, presses really when corner angle echo highest on the face A in gate
Recognize key, system program calculates angle value automatically and shows result.
7. test method described in accordance with the claim 3, it is characterised in that: the detailed process of echo highest confirmation is
After starting sampling, counter is started to work and is counted from zero, and one Counter Value of every sampling adds 1；
From position of strobe time beginning, the current value after AD conversion can all be sent to the end a [7:0] of comparator each time
Compared with the data at the end b [7:0] carry out size；B [7:0] end data is provided by the output end of most value register, most value register
It is middle to retain the maximum value acquired within the scope of gate widths；
Control of the loading procedure of most value register by signal Signal1 in system；Signal Signal1 is that comparator is greater than output
Signal, indicates the value that AD digital signal amount currently entered is greater than in most value register, which will be such that most value buffer handle works as
Preceding new value is loaded into most value register, updates numerical value in most value register；
Most value indexed registers loading procedure is controlled by signal Signal2, indicates that AD digital signal amount currently entered is greater than most
Value in value register, which, which is loaded into counter current value, is most worth in indexed registers, updates and is most worth indexed registers
Value；
After the gate widths time, counter and comparator stop working；System obtains the value being most worth in indexed registers
MaxIndex, the as position of maximum amplitude, the sample frequency of AD sampling module are 100MHz/8bit, are sampled at interval of 10ns
One point, ultrasonic wave reach the transmission time of defect from transmitting are as follows: 10 × MaxIndex/1000 μ s is saved in memory and supplies
It calculates and uses；
After echo wave signal acquisition is complete, the data after the sampling of AD sampling module are compressed and store FIFO by FPGA module to be delayed
It rushes in area, is finally read and sent to display by MCU module and show.When highest echo occurs in screen, MCU module obtains man-machine
User provides order of accepting one's fate really by keyboard in interface module, and caller calculates angle value automatically.
8. test method described in accordance with the claim 3, it is characterised in that: the step 2 low-angle head angle test is specific
Process is
It is t from the corner angle propagation time under the face A is emitted to that probe, which is placed in the face TZ-R test block B under the face A when corner angle echo highest,1；
Probe is placed in the face TZ-R test block B, is t from the corner angle propagation time on the face A is emitted on the face A when corner angle echo highest2；
Obtain time T=2 × t that ultrasonic wave transmits in probe chip1-t2；
When low-angle incidence angle is at 9 ° -12 °, formula is obtained
When low-angle incidence angle is at 6 ° -8 °, probe is placed in the face TZ-R test block C, on the face A when corner angle echo highest, from being emitted to A
The corner angle propagation time is t on face3, obtain formula
Wherein: θ is probe refraction angle, and C is ultrasonic wave in test block acoustic speed of propagation.
9. test method described in accordance with the claim 3, it is characterised in that: the step 3 angle probe angle measurement detailed process
For
Probe is placed in detection R100 arc surface in LG-R test block, is moved forward and backward and pops one's head in and keep probe parallel with test block side, directly
Reach highest to R100 arc surface back wave, is t from the arc surface time is emitted to4；
The time T=t that ultrasonic wave transmits in probe chip4-100/C×1000；
Probe is placed in wheel tread, and ultrasonic wave, which encounters hole, can generate echo, is from being emitted to hole transmission time at this time
t5；
If radius of wheel is R, artificial aperture is r, and probe refraction angle is θ, and ultrasonic wave velocity of sound in workpiece is C, establishes following number
Model is learned, by Probe index A, in the triangle OAB that wheel center point O and artificial central point of hole B are constituted, is obtained by the cosine law
To AO2+AB2- 2 × AB × AO × cos θ=BO2,
Acquire θ=arccos ((AO2+AB2-BO2)/(2×AB×AO))
Wherein, θ is probe refraction angle, and C is ultrasonic wave in test block acoustic speed of propagation, AO=R, AB=C × (t5- T)/1000+r, BO=
R-(h+r)。
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