TWI686618B - Single probe type nonlinear ultrasonic detecting device and method thereof - Google Patents

Abstract

The invention discloses a single probe type nonlinear ultrasonic detecting device and a method thereof. First, a first voltage signal is used to drive a dual frequency ultrasonic probe to emit an ultrasonic signal to an object, and the object reflects the ultrasonic signal as an Echo signal. Then, the dual-frequency ultrasonic probe receives the echo signal and converts it into a second voltage signal. Then, the second voltage signal is processed by a superheterodyne receiver to generate an original signal. Finally, the original signal is integrated according to the start time point and the end time point of the waveform of the second voltage signal to obtain a frequency spectrum signal having a frequency of the ultrasonic signal and the echo signal, and according to the first voltage signal and the second The amplitude of the voltage signal takes a detected value of the object to identify the aging condition of the object.

Description

Single-probe nonlinear ultrasonic detection device and method

The invention relates to an ultrasonic detection technology, and particularly to a single-probe type nonlinear ultrasonic detection device and method.

In non-destructive testing, ultrasonic technology is often used for testing. As shown in FIG. 1, the ultrasonic transceiver 10 is used to transmit an ultrasonic signal to an object 12. Therefore, the choice of ultrasonic detection technology has considerable influence. The type of ultrasonic echo determines the presence or absence of defects in the detected object. The ultrasonic echo received by the probe represents the state of the detected object, and its waveform represents the quality of the detected object. Traditionally, the flaw reflected echo signal is used as the criterion for flaw judgment. This method can only obtain the larger flaw signal. Since the reflected signal of the small flaw is too small, it is difficult to detect in the detection. In the evaluation of object aging, no effective speculation can be made. It can only be repaired after the defect appears, and it cannot be pre-warned before the defect occurs or during the period of small defects. Therefore, the conventional technology cannot effectively perform aging evaluation and early warning on the detected object, that is, it cannot effectively present the true state of the object itself. On the other hand, traditional non-linear ultrasonic measurement methods are all dual-probe measurement methods, and dual-probe installation cannot be performed in many environments.

For example, the Taiwan Patent No. I167172 new patent case discloses a nonlinear ultrasonic tuning controller. This device is used to control the stability of the oscillation frequency of the crystal oscillation circuit, and the ultrasonic signal is not used for detection. US patents US5980457A, US6010456A and US6544182B2, these three patents treat nonlinear ultrasonic signals as noise and filter them out, It is not used for testing. The US patents US5736642A and US9772315B2, these two patents mainly use the mixing method and the surface wave method for ultrasonic detection. This shortcoming will cause too many spectrum signals, and it is difficult to effectively confirm what state factors the signal originates from, such as general defect signals, Small flaw signals and object aging signals will be included in the mixing signal, which is difficult to distinguish. Moreover, the surface wave cannot be directly coupled with the object, which easily causes excessive signal attenuation and makes the detection signal disappear.

Therefore, in view of the above-mentioned problems, the present invention proposes a single-probe nonlinear ultrasonic detection device and method to solve the problems caused by the conventional knowledge.

The main purpose of the present invention is to provide a single-probe nonlinear ultrasonic detection device and method thereof, which uses dual-frequency ultrasonic probes to detect objects to avoid the installation problem of dual probes and make the whole device easy to carry, while The superheterodyne receiver is used to reduce the influence of noise to obtain the original signal, and the gated integrator is used to integrate the original signal to identify the object aging situation and the early warning defect situation.

To achieve the above object, the present invention provides a single-probe nonlinear ultrasonic detection device, which includes a dual-frequency ultrasonic probe, an ultrasonic driver, a superheterodyne receiver, an oscilloscope, a gated integrator and A computer host. The dual-frequency ultrasonic probe corresponds to an object setting. The ultrasonic driver is electrically connected to the dual-frequency ultrasonic probe, and generates a first voltage signal to drive the dual-frequency ultrasonic probe to emit an ultrasonic signal to the object, and the ultrasonic signal reflected by the object is an echo signal. The echo frequency divided by the transmission frequency of the ultrasonic signal is equal to a ratio, which is an integer greater than 1, and the dual-frequency ultrasonic probe receives the echo signal and converts it into a second voltage signal. The superheterodyne receiver is electrically connected to a dual-frequency ultrasonic probe and receives the second voltage signal. The superheterodyne receiver uses an oscillation signal to mix with the second voltage signal to generate an intermediate frequency signal. The differential receiver amplifies the intermediate frequency signal and filters out the noise of the intermediate frequency signal, To generate an original signal. The oscilloscope is electrically connected to the dual-frequency ultrasonic probe and receives the second voltage signal to display the waveform of the second voltage signal and the start time point and end time point of this waveform. The gated integrator is electrically connected to the oscilloscope and the superheterodyne receiver, and receives the original signal, and integrates the original signal according to the start time point and the end time point to obtain a spectrum signal having an echo frequency and a transmission frequency. The computer host is electrically connected to the ultrasonic driver, gate-controlled integrator and dual-frequency ultrasonic probe, and receives the spectrum signal, the first voltage signal and the second voltage signal, according to the amplitude and the first voltage signal and the second voltage signal The above ratio obtains one of the detected values of the object.

In an embodiment of the invention, the superheterodyne receiver further includes an oscillator, a mixer, an intermediate frequency amplifier circuit and a detector. The oscillator generates an oscillation signal. The mixer is electrically connected to a dual-frequency ultrasonic probe and an oscillator, and receives the oscillation signal and the second voltage signal, and mixes the oscillation signal and the second voltage signal to generate an intermediate frequency signal. . The intermediate frequency amplifier circuit is electrically connected to the mixer and receives the intermediate frequency signal to amplify it to generate an intermediate frequency amplified signal. The detector is electrically connected to the intermediate frequency amplification circuit and the gate-controlled integrator, and receives the intermediate frequency amplification signal, and filters out the noise to generate the original signal.

In one embodiment of the present invention, the gated integrator integrates the original signal by Fast Fourier Transform (FFT).

，A2為第二電壓訊號之振幅，A1為第一電壓訊號之振幅，K為上述比例。 In one embodiment of the present invention, the detection value is

A2 is the amplitude of the second voltage signal, A1 is the amplitude of the first voltage signal, and K is the above ratio.

In one embodiment of the present invention, the single-probe nonlinear ultrasonic detection device further includes a display, which is electrically connected to the host computer to receive and display the spectrum signal.

The invention provides a single-probe nonlinear ultrasonic detection method. First, a first-frequency signal is used to drive a dual-frequency ultrasonic probe to transmit an ultrasonic signal to an object, and the ultrasonic signal reflected by the object is an echo signal. The echo frequency of the echo signal divided by the transmission frequency of the ultrasonic signal is equal to a ratio, which is an integer greater than 1. Then, the dual-frequency ultrasonic probe is connected The wave signal is recovered and converted into a second voltage signal. Next, the second voltage signal is received, and an oscillating signal is mixed with the second voltage signal to generate an intermediate frequency signal. Then, the IF signal is amplified, and the noise of the IF signal is filtered to generate an original signal. Integrate the original signal according to the start time and end time of the waveform of the second voltage signal to obtain a spectrum signal having an echo frequency and a transmission frequency. Finally, the spectrum signal, the first voltage signal and the second voltage signal are received to obtain a detection value of the object according to the amplitude and ratio of the first voltage signal and the second voltage signal.

In an embodiment of the present invention, in the step of integrating the original signal according to the start time point and the end time point, the original signal is integrated by Fast Fourier Transform (FFT) according to the start time point and the end time point .

In order to make your examination committee have a better understanding and understanding of the structural features and achieved effects of the present invention, I would like to use the preferred embodiment drawings and detailed descriptions, the explanations are as follows:

10: Ultrasonic transceiver

12: Object

14: Dual-frequency ultrasonic probe

16: Ultrasonic driver

18: Superheterodyne receiver

20: Oscilloscope

22: Gate-controlled integrator

24: computer host

26: Display

28: Object

30: Oscillator

32: Mixer

34: IF amplifier circuit

36: Geophone

Figure 1 is a schematic diagram of the prior art using an ultrasonic transceiver to transmit an ultrasonic signal to an object.

Fig. 2 is a circuit block diagram of an embodiment of the single-probe nonlinear ultrasonic detection device of the present invention.

Figure 3 is a flow chart of one embodiment of the single-probe nonlinear ultrasonic detection method of the present invention.

The embodiments of the present invention will be further explained in the following with the related drawings. As much as possible, in the drawings and the description, the same reference numerals represent the same or similar components. In the scheme, Due to simplification and convenience of marking, the shape and thickness may be exaggerated. It can be understood that the elements that are not specifically shown in the drawings or described in the specification have a form known to those skilled in the art. Those of ordinary skill in the art can make various changes and modifications according to the content of the present invention.

，A2為第二電壓訊號V2之振幅，A1為第一電壓訊號V1之振幅，K為上述比例。顯示器26電性連接電腦主機24，以接收並顯示頻譜訊號P，以顯示偵測結果。相較雙探頭式量測方法，本發明利用雙頻式超音波探頭14對物體28進行檢測，以避免雙探頭安裝問題，使整個裝置便於攜帶，同時利用超外差式接收器18降低雜訊影響，以取得原始訊號G，並利用閘控積分器22對原始訊號G積分，以辨識物體28之老化情形及預警物體28之瑕疵情形。 Please refer to FIGS. 2 and 3 below to introduce the single-probe nonlinear ultrasonic detection device of the present invention, which includes a dual-frequency ultrasonic probe 14, an ultrasonic driver 16, and a superheterodyne receiver 18. An oscilloscope 20, a gate-controlled integrator 22, a computer host 24 and a display 26. The dual-frequency ultrasonic probe 14 is provided corresponding to an object 28. The ultrasonic driver 16 is electrically connected to the dual-frequency ultrasonic probe 14 and generates a first voltage signal V1 to drive the dual-frequency ultrasonic probe 14 to transmit an ultrasonic signal U to the object 28, and the object 28 reflects the ultrasonic signal U as one For the echo signal B, the echo frequency of the echo signal B divided by the transmission frequency of the ultrasonic signal U is equal to a ratio, and the ratio is an integer greater than 1. The dual-frequency ultrasonic probe 14 receives the echo signal B and converts it to a second voltage signal V2. The superheterodyne receiver 18 is electrically connected to the dual-frequency ultrasonic probe 14 and receives the second voltage signal V2. The superheterodyne receiver 18 mixes an oscillating signal O with the second voltage signal V2 to generate an intermediate frequency signal M. The superheterodyne receiver 18 amplifies the intermediate frequency signal M and filters out the intermediate frequency signal M Noise to generate an original signal G. The oscilloscope 20 is electrically connected to the dual-frequency ultrasonic probe 14 and receives the second voltage signal V2 to display the waveform of the second voltage signal V2 and the start time point and end time point of this waveform. The gated integrator 22 is electrically connected to the oscilloscope 20 and the superheterodyne receiver 18, and receives the original signal G, and integrates the original signal G by Fast Fourier Transform (FFT) according to the start time point and the end time point To obtain a spectrum signal P with one of the echo frequency and the transmit frequency. The computer host 24 is electrically connected to the ultrasonic driver 16, the gate-controlled integrator 22 and the dual-frequency ultrasonic probe 14, and receives the spectrum signal P, the first voltage signal V1 and the second voltage signal V2 according to the first voltage signal V1 A detection value of the object 28 is obtained with the amplitude of the second voltage signal V2 and the above ratio. The higher the detection value, the more severe the aging or defects. For example, the detection value is

A2 is the amplitude of the second voltage signal V2, A1 is the amplitude of the first voltage signal V1, and K is the above ratio. The display 26 is electrically connected to the computer host 24 to receive and display the spectrum signal P to display the detection result. Compared with the dual-probe measurement method, the present invention uses the dual-frequency ultrasonic probe 14 to detect the object 28 to avoid the dual-probe installation problem and make the entire device portable, while using the superheterodyne receiver 18 to reduce noise Influence to obtain the original signal G, and use the gated integrator 22 to integrate the original signal G to identify the aging of the object 28 and warn of the defect of the object 28.

The single-probe nonlinear ultrasonic detection method of the present invention is described below. First, as shown in step S10, the ultrasonic driver 16 generates the first voltage signal V1 to drive the dual-frequency ultrasonic probe 14 to transmit the ultrasonic signal U to the object 28, The ultrasonic signal U reflected by the object 28 is the echo signal B, and the echo frequency of the echo signal B divided by the transmission frequency of the ultrasonic signal U is equal to a ratio, which is an integer greater than 1. Next, as shown in step S12, the dual-frequency ultrasonic probe 14 receives the echo signal B and converts it into the second voltage signal V2. Next, as shown in step S14, the superheterodyne receiver 18 mixes the oscillation signal O with the second voltage signal V2 to generate the intermediate frequency signal M. Then, as shown in step S16, the superheterodyne receiver 18 amplifies the intermediate frequency signal M and filters out the noise of the intermediate frequency signal M to generate the original signal G. After the original signal G is generated, as shown in step S18, the gated integrator 22 receives the original signal G, and performs Fast Fourier Transform (FFT) according to the start time and end time of the waveform of the second voltage signal V2 ) Integrate the original signal G to obtain a spectrum signal P with an echo frequency and a transmission frequency. Finally, as shown in step S20, the computer host 24 receives the spectrum signal P, the first voltage signal V1 and the second voltage signal V2 to obtain the object 28 according to the amplitude of the first voltage signal V1 and the second voltage signal V2 and the above ratio Detection value.

The superheterodyne receiver 18 further includes an oscillator 30, a mixer 32, an intermediate frequency amplifier circuit 34 and a detector 36. The oscillator 30 generates an oscillation signal O, and the mixer 32 is electrically connected to the dual-frequency ultrasonic probe 14 and the oscillator 30, and receives the oscillation signal O and the second voltage signal V2, and The oscillation signal O is mixed with the second voltage signal V2 to generate an intermediate frequency signal M. The intermediate frequency amplifier circuit 34 is electrically connected to the mixer 32 and receives the intermediate frequency signal M to amplify it to generate an intermediate frequency amplified signal MA. The detector 36 is electrically connected to the intermediate frequency amplification circuit 34 and the gated integrator 22, and receives the intermediate frequency amplification signal MA, and filters out noise therein to generate the original signal G.

In summary, the present invention uses dual-frequency ultrasonic probes to detect objects to avoid dual-probe installation problems, making the entire device portable, while using superheterodyne receivers to reduce the effects of noise and obtain original signals. And use the gated integrator to integrate the original signal to identify the aging situation of the object and the defect situation of the early warning object.

The above is only a preferred embodiment of the present invention and is not intended to limit the scope of the implementation of the present invention. Therefore, all changes and modifications based on the shape, structure, features and spirit described in the patent application scope of the present invention are cited. , Should be included in the scope of the patent application of the present invention.

14: Dual-frequency ultrasonic probe

16: Ultrasonic driver

18: Superheterodyne receiver

20: Oscilloscope

22: Gate-controlled integrator

24: computer host

26: Display

28: Object

30: Oscillator

32: Mixer

34: IF amplifier circuit

36: Skin detector

Claims (8)

A single-probe nonlinear ultrasonic detection device includes: a dual-frequency ultrasonic probe, corresponding to an object setting; an ultrasonic driver, electrically connected to the dual-frequency ultrasonic probe, and generating a first voltage signal drive The dual-frequency ultrasonic probe transmits an ultrasonic signal to the object, the object reflects the ultrasonic signal as an echo signal, and the echo frequency of the echo signal divided by the ultrasonic signal's transmission frequency is equal to a ratio, The ratio is an integer greater than 1. The dual-frequency ultrasonic probe receives the echo signal and converts it to a second voltage signal; a superheterodyne receiver electrically connected to the dual-frequency ultrasonic probe And receive the second voltage signal, the superheterodyne receiver uses an oscillating signal to mix with the second voltage signal to generate an intermediate frequency signal, the superheterodyne receiver amplifies the intermediate frequency signal, and Filter the noise of the intermediate frequency signal to generate an original signal; an oscilloscope, electrically connected to the dual-frequency ultrasonic probe, and receive the second voltage signal to display the waveform of the second voltage signal and the waveform The starting time point and the ending time point; a gated integrator, which is electrically connected to the oscilloscope and the superheterodyne receiver, and receives the original signal, and integrates the signal according to the starting time point and the ending time point The original signal to obtain a spectrum signal having the echo frequency and the transmission frequency; and a computer host, electrically connected to the ultrasonic driver, the gated integrator and the dual-frequency ultrasonic probe, and receiving the spectrum The signal, the first voltage signal and the second voltage signal are used to obtain a detection value of the object according to the amplitude and the ratio of the first voltage signal and the second voltage signal. The single-probe nonlinear ultrasonic detection device according to claim 1, wherein the superheterodyne receiver further includes: An oscillator generates the oscillation signal; a mixer electrically connects the dual-frequency ultrasonic probe and the oscillator, and receives the oscillation signal and the second voltage signal, and the oscillation signal and the second The voltage signals are mixed to generate the intermediate frequency signal; an intermediate frequency amplifier circuit is electrically connected to the mixer and receives the intermediate frequency signal to amplify it to generate an intermediate frequency amplified signal; and a detector , Electrically connect the intermediate frequency amplifier circuit and the gated integrator, and receive the intermediate frequency amplifier signal, and filter out the noise to generate the original signal. The single-probe nonlinear ultrasonic detection device according to claim 1, wherein the gated integrator integrates the original signal by Fast Fourier Transform (FFT). The single-probe nonlinear ultrasonic detection device according to claim 1, wherein the detection value is

, A2 is the amplitude of the second voltage signal, A1 is the amplitude of the first voltage signal, and K is the ratio. The single-probe non-linear ultrasonic detection device according to claim 1, further comprising a display, which is electrically connected to the computer host to receive and display the spectrum signal. A single-probe nonlinear ultrasonic detection method includes the following steps: driving a dual-frequency ultrasonic probe with a first voltage signal to transmit an ultrasonic signal to an object, the object reflecting the ultrasonic signal as an echo signal , The echo frequency of the echo signal divided by the transmission frequency of the ultrasonic signal is equal to a ratio, and the ratio is an integer greater than 1; the dual-frequency ultrasonic probe receives the echo signal and converts it to a first Two voltage signals; Receiving the second voltage signal and mixing an oscillating signal with the second voltage signal to generate an intermediate frequency signal; amplifying the intermediate frequency signal and filtering the noise of the intermediate frequency signal to generate an original signal ; Integrate the original signal according to the start time and end time of the waveform of the second voltage signal to obtain a spectrum signal with the echo frequency and the transmission frequency; and receive the spectrum signal and the first voltage signal And the second voltage signal to obtain a detection value of the object according to the amplitude and the ratio of the first voltage signal and the second voltage signal. The single-probe non-linear ultrasonic detection method according to claim 6, wherein in the step of integrating the original signal according to the start time point and the end time point, it is based on the start time point and the end time point The original signal is integrated by Fast Fourier Transform (FFT). The single-probe nonlinear ultrasonic detection method as described in claim 6, wherein the detection value is

, A2 is the amplitude of the second voltage signal, A1 is the amplitude of the first voltage signal, and K is the ratio.

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