CN2220635Y - Scanning type wide tape ultrasonic detecting instrument with computer controlled - Google Patents
Scanning type wide tape ultrasonic detecting instrument with computer controlled Download PDFInfo
- Publication number
- CN2220635Y CN2220635Y CN 94216021 CN94216021U CN2220635Y CN 2220635 Y CN2220635 Y CN 2220635Y CN 94216021 CN94216021 CN 94216021 CN 94216021 U CN94216021 U CN 94216021U CN 2220635 Y CN2220635 Y CN 2220635Y
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- China
- Prior art keywords
- frequency
- output
- wave detector
- amplifier
- filter
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- Expired - Fee Related
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- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The utility model relates to a scanning type broad band ultrasonic detecting instrument with computer control. The output of the broad band ultrasonic sensor can be connected with a wave detector by an amplifier and a filter whose central frequency is variable; one output path of the wave detector is connected with an earphone by a voltage frequency converter; the other path of the wave detector is connected with an SCM system by an A/D converter. The input of a programmable counter is connected with the output of the SCM system; the output of the programmable counter is connected with the scanning-frequency oscillator of the filter whose central frequency is variable; one output path of the scanning-frequency oscillator and the output of the amplifier are connected with the wave detector by a frequency changer and the filter; the other output path of the scanning-frequency oscillator is connected with the counter. The utility model has wide range of frequency band, high signal-to-noise ration, high sensitivity and wider application range.
Description
The utility model relates to a kind of supersonic reflectoscope, relates in particular to a kind of broadband ultrasonic wave detector that constitutes with the digital phase-locked loop frequency sweep generator formation variable wave filter of centre frequency of computer programming.
Existing supersonic reflectoscope, receive frequency is fixed, and automaticity is low, and frequency band range is narrow, and signal to noise ratio (S/N ratio) is low, and the sensitivity of Ultrasonic Detection is also lower, thereby range of application is narrow, and detection efficiency is low.
The purpose of this utility model is to avoid above-mentioned weak point of the prior art, and provide a kind of frequency at interval and swept frequency range can be by computer control, the automaticity height, frequency band range is wide, the signal to noise ratio (S/N ratio) height, highly sensitive, the scope of application is wide, the computer control sweep-frequency B broadband ultrasonic wave detector that efficient is high.
The purpose of this utility model can reach by following measure:
A kind of computer control sweep-frequency B broadband ultrasonic wave detector, comprise ultrasonic sensor (1) and amplifier (2), its special character is that described ultrasonic sensor (1) is the broad band ultrasonic wave sensor, and its output connects wave detector (7) through the centre frequency variable filter; The output one tunnel of described wave detector (7) is through Voltage-to-frequency Converter (11) lug machine (12), and another road connects Single Chip Microcomputer (SCM) system (9) through A/D converter (8); Described centre frequency variable filter is made up of frequency sweep generator (5), wave filter (4) and frequency converter (3), the output of Single Chip Microcomputer (SCM) system (9) connects frequency sweep generator (5) through programmable counter (6), the output one tunnel of frequency sweep generator (5) connects wave detector (7) with amplifier (2) output through frequency converter (3), wave filter (4), and another road connects programmable counter (6); Latch IC9, memory IC10 that described Single Chip Microcomputer (SCM) system (9) comprises single-chip microcomputer IC8 and joins with it.
Amplifier of the present utility model (2) can comprise wide band high-gain integrated amplifier IC1 and be connected to the output of its first amplifier and the input of second amplifier between dual gate FET BG1, the 2nd grid G2 of described dual gate FET BG1 is connected to variable resistor W1.
Frequency sweep generator of the present utility model (5) can comprise phase locking unit IC3, is connected to the low-pass filter of its output terminal, and low-pass filter output connects voltage controlled oscillator through varactor D1; Described frequency converter (3) is made of dual gate FET BG2; Described wave filter (4) is the bandpass filter that is made of amplifier IC2.
The active wave detector that wave detector of the present utility model (7) can be made up of amplifier IC6; Described Voltage-to-frequency Converter (11) is made of ic chip 18.
The accompanying drawing drawing is described as follows:
Fig. 1 is a theory diagram of the present utility model.
Fig. 2 is the circuit theory diagrams of the utility model amplifier.
Fig. 3 is the circuit theory diagrams of variable filtering of the utility model centre frequency and detecting device.
Fig. 4 is the circuit theory diagrams of the utility model Single Chip Microcomputer (SCM) system A/D converter and display.
Fig. 5 is the circuit theory diagrams of the utility model Voltage-to-frequency Converter.
The utility model is described in further detail below in conjunction with accompanying drawing:
Referring to Fig. 1, it is the broad band ultrasonic sensor of 20～82KHz that sensor 1 of the present utility model adopts frequency response, and its output connects amplifier 2.The effect of programmable counter 6 has two, and the first produces reference frequency fr with the clock frequency frequency division of Single Chip Microcomputer (SCM) system 9, that is the frequency spacing value; It two is under the programming Control of Single Chip Microcomputer (SCM) system 9, form the Fractional-N frequency device of the output fo of frequency sweep generator 5, N is variable, programmable counter 6 output frequencies are the phase locking unit phase demodulation of the oscillator signal of fd to frequency sweep generator 5, the frequency range of fo is 120,122 ... 182KHz, totally 32 frequencies, frequency is 2KHz at interval.Amplifier 2 output frequencies be the signal of fs and oscillator signal that frequency is fo after frequency converter 3 frequency conversions, the first-harmonic of output signal spectrum is fo ± fs.This signal is after wave filter 4 filtering that centre frequency is 100KHz, broadband for ± 1.5KHz, and the centre frequency that is fixed is the signal of fo-fs=100KHz.Frequency converter 3, wave filter 4, frequency sweep generator 5 and programmable counter 6 constitute the centre frequency variable filter.When fo=120～182KHz, the signal center frequency of response is 20～82KHz, and the output of centre frequency variable filter is through wave detector 7, and one the tunnel exports Voltage-to-frequency Converter 11 to, is transformed into audio frequency by earphone 12 outputs; Another road converts digital quantity to through A/D converter 8, delivers to Single Chip Microcomputer (SCM) system 9.The software program of Single Chip Microcomputer (SCM) system 9 comprises signal strength peak value search subroutine, behind the peak value that searches intensity, promptly locks the frequency sweep frequency.After the end of test (EOT), can manually remove.Display 10 is used to show the ultrasonic frequency and the signal level of reception.Referring to Fig. 2, amplifier 2 mainly is made of wide band high-gain integrated amplifier IC1 and dual gate FET BG1.IC1 adopts μ PC1018C; BG1 adopts 4D01.The change in voltage of the 2nd grid G2 of BG1 can change mutual conductance, regulate the gain of variable resistor W1 may command BG1, referring to Fig. 3, programmable counter 6 is that IC4 adopts 8253, in 3 countings, timer are arranged, the A0 of counter IC4, A1 select for counting, the data input of D0～D7 for presetting, and the signal of A0, A1 and D0～D7 comes by the Po mouth of Single Chip Microcomputer (SCM) system 9.The ALE pulse of the 2MHz of Single Chip Microcomputer (SCM) system 9 is input to the clock end CLKo of the counter of counter IC4, obtains the OUTo output of the reference oscillation fr of about 2KHz by IC4 behind frequency division.Another counter of IC4 is formed the Fractional-N frequency device, frequency sweep output fo is added to the CLK1 end of IC4 as clock, be added to 7 pin of the phase locking unit IC3 of frequency sweep generator 5 then by the OUT1 end output fd of IC4, IC3 adopts the CH5081 phase comparator, output is relatively sent into resistance R 3～R6 by its 3 pin, the low-pass filter that capacitor C 5～C6 forms, filtered voltage adds to varactor D1.Resistance R 1～R2, inductance L 1～L2, capacitor C 1～C4 and field effect transistor 3G3 form voltage controlled oscillator.Frequency division value N is by the Single Chip Microcomputer (SCM) system software control, sent into by D0～D7 of counter IC4.Frequency converter 3 is made of dual gate FET BG2, and to be 100KHz, bandwidth be the active band-pass filter of ± 1.5HZ to the centre frequency that wave filter 4 is made up of amplifier IC2.Wave detector 7 is formed active wave detector by amplifier IC6, and the direct current UT that exports after the detection delivers to A/D converter 8.Referring to Fig. 4, Single Chip Microcomputer (SCM) system 9 is made up of single-chip microcomputer IC8, latch IC9 and memory IC10.A/D converter 8 is that IC7 adopts ADC0807, and the UT of wave detector 7 outputs is added to 6 pin of A/D converter IC7, and output 8 bit digital quantity DB0～DB7 are to the input port P1 mouth of single-chip microcomputer IC8 under Single Chip Microcomputer (SCM) system 9 controls.Potentiometer W2 is used to adjust the reference voltage of circuit.Display 10 a usefulness expansion mouthful IC13 makes display controller, data are by D0～D7 input of IC13, and mode of operation is by A0, A1 control, and the graphemic code of PA mouth output is latched by latch IC14, and drive each display segment of display tube I3, the demonstration of control font 0～9 via driver IC 16.The word bit sign indicating number of the PB mouth output of expansion mouthful IC3 is latched by latch IC15, and drives the demonstration word bit via driver IC 17.The digital model of signal intensity peak value search subroutine of the present utility model is to be based upon on the basis of following borrow subtraction Sn=Dn-Dn-
1(borrow Cn) wherein, Dn, Dn-1 are respectively frequency, fs (n-
1), the level digital amount of fsn, Sn is a remainder, Cn is borrow.As Dn＞Dn-
1The time, Cn is 0; As Dn＜Dn-
1The time, Cn=1.The borrow Cn and the Cn+ of the subtraction of more adjacent two numbers
1, as Cn ≠ Cn+
1The time, Dn is peak point, and software interruption is set this moment, input locking subroutine.The INTo that puts single-chip microcomputer IC8 by manual disengage button S1 that removes of above-mentioned interruption interrupts removing, and the interruption application of INTo makes single-chip microcomputer IC8 change the automatic frequency sweep program over to.Referring to Fig. 5, Voltage-to-frequency Converter 11 is made of ic chip 18, and it can adopt LM331, and the sound signal of its output is delivered to earphone 12.
The utility model compared with prior art has following advantage:
1, the frequency interval and the swept frequency range that receive signal can be controlled by computer programming, And energy automatic search signal strength signal intensity peak value, the automaticity height.
2, frequency is adjustable, and frequency band range is wide, the signal to noise ratio height.
3, enlarge widely sensitivity and the scope of application of Ultrasonic Detection, improved inspection Survey efficient.
Claims (4)
1, a kind of computer control sweep-frequency B broadband ultrasonic wave detector, comprise ultrasonic sensor (1) and amplifier (2), it is characterized in that: described ultrasonic sensor (1) is the broad band ultrasonic wave sensor, and its output connects wave detector (7) through the centre frequency variable filter; The output one tunnel of described wave detector (7) connects Single Chip Microcomputer (SCM) system (9) through Voltage-to-frequency Converter (11) lug machine (12), another road through A/D converter (8); Described centre frequency variable filter is made up of frequency sweep generator (5), wave filter (4) and frequency converter (3), the output of Single Chip Microcomputer (SCM) system (9) connects frequency sweep generator (5) through programmable counter (6), the output one tunnel of frequency sweep generator (5) connects wave detector (7) with amplifier (2) output through frequency converter (3), wave filter (4), and another road connects programmable counter (6); Latch IC9, memory IC10 that described Single Chip Microcomputer (SCM) system (9) comprises single-chip microcomputer IC8 and joins with it.
2, computer control sweep-frequency B broadband ultrasonic wave detector as claimed in claim 1, it is characterized in that: described amplifier (2) comprise wide band high-gain integrated amplifier IC1 and be connected to the output of its first amplifier and the input of second amplifier between dual gate FET BG1, the 2nd grid G2 of described dual gate FET BG1 is connected to variable resistor W1.
3, computer control sweep-frequency B broadband ultrasonic wave detector as claimed in claim 1 or 2, it is characterized in that: described frequency sweep generator (5) comprises phase locking unit IC3, be connected to the low-pass filter of its output terminal, low-pass filter output connects voltage controlled oscillator through varactor D1; Described frequency converter (3) is made of dual gate FET BG2; Described wave filter (4) is the bandpass filter that is made of amplifier IC2.
4, computer control sweep-frequency B broadband ultrasonic wave detector as claimed in claim 3 is characterized in that: the active wave detector that described wave detector (7) is made up of amplifier IC6; Described Voltage-to-frequency Converter (11) is made of ic chip 18.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94216021 CN2220635Y (en) | 1994-06-18 | 1994-06-18 | Scanning type wide tape ultrasonic detecting instrument with computer controlled |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94216021 CN2220635Y (en) | 1994-06-18 | 1994-06-18 | Scanning type wide tape ultrasonic detecting instrument with computer controlled |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2220635Y true CN2220635Y (en) | 1996-02-21 |
Family
ID=33831845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94216021 Expired - Fee Related CN2220635Y (en) | 1994-06-18 | 1994-06-18 | Scanning type wide tape ultrasonic detecting instrument with computer controlled |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2220635Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333243C (en) * | 2004-06-15 | 2007-08-22 | 东北师范大学 | Dynamic measuring system with four sensors for acoustic field spacial distribution of acho signals of bat |
| CN102305827A (en) * | 2011-08-24 | 2012-01-04 | 南京航空航天大学 | Love wave sensor testing system based on frequency sweeping technology, and a testing method thereof |
| CN106596046A (en) * | 2016-12-30 | 2017-04-26 | 中国海洋大学 | Stress observation device for ocean structure under internal solitary wave environment |
-
1994
- 1994-06-18 CN CN 94216021 patent/CN2220635Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333243C (en) * | 2004-06-15 | 2007-08-22 | 东北师范大学 | Dynamic measuring system with four sensors for acoustic field spacial distribution of acho signals of bat |
| CN102305827A (en) * | 2011-08-24 | 2012-01-04 | 南京航空航天大学 | Love wave sensor testing system based on frequency sweeping technology, and a testing method thereof |
| CN102305827B (en) * | 2011-08-24 | 2013-05-29 | 南京航空航天大学 | Love wave sensor testing system based on frequency sweeping technology, and a testing method thereof |
| CN106596046A (en) * | 2016-12-30 | 2017-04-26 | 中国海洋大学 | Stress observation device for ocean structure under internal solitary wave environment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |