Elastic wave radar detection device and method

1 . An elastic wave radar detection method, applied to an elastic wave radar detection device, wherein the elastic wave radar detection device comprises a vibration excitation device, a first sensor, a second sensor, and a controller, wherein the first sensor is arranged on the vibration excitation device, the second sensor is arranged on a detected object, the first sensor is configured to collect vibration excitation information, namely, an incident signal, the second sensor is configured to collect information of the detected object, namely, a vibration signal, and both the first sensor and the second sensor are connected to the controller;

wherein the elastic wave radar detection method comprises the following steps:

Step 1: knocking on different positions of the detected object through the vibration excitation device to obtain data for a plurality of knocks, comprising the incident signal and the vibration signal;

Step 2: processing the incident signal to obtain a standard incident signal;

Step 3: respectively performing Fourier transform on the incident signal, the vibration signal and the standard incident signal after each knock to obtain respective corresponding frequency domain complex representation forms, which are respectively X i (f), Y i (f) and X 0 (f); and substituting X i (f), Y i (f) and X 0 (f) into an elastic wave radar algorithm theoretical formula to obtain a frequency domain representation form of a vibration signal similar to a radar wave:

Y

i

′

(

f

)

=

Y

i

(

f

)

X

i

(

f

)

⁢

X

0

(

f

)

.

and

Step 4: performing inverse Fourier transform on the frequency domain representation form of the vibration signal similar to the radar wave, so as to obtain a time domain waveform of the processed vibration signal.

2 . The elastic wave radar detection method according to claim 1 , wherein the vibration excitation device is a vibration excitation hammer, the vibration excitation hammer comprises a handle and a circular-arc-shaped hammer head, the handle is fixedly connected to the circular-arc-shaped hammer head, the first sensor is fixedly arranged on the circular-arc-shaped hammer head, and a direction of the first sensor is perpendicular to a circular arc surface, making contact with the ground, of the circular-arc-shaped hammer head.

3 . The elastic wave radar detection method according to claim 1 , wherein the vibration excitation device is a vibration excitation rod, the vibration excitation rod comprises a rod body, a connector, and a hammer head, one end of the rod body is provided with a first thread, one end of the connector is provided with a first screw hole corresponding to the first thread, and the connector is fixedly arranged on the rod body through the first thread and the first screw hole; the other end of the connector is provided with a second screw hole, one end of the hammer head is provided with a second thread corresponding to the second screw hole, and the hammer head is fixedly arranged on the connector through the second thread and the second screw hole; the other end of the hammer head is provided with a circular arc surface for making contact with the detected object; and the first sensor is fixedly arranged inside the rod body or the connector, and a direction of the first sensor is consistent with an axis direction of the rod body.

4 . The elastic wave radar detection method according to claim 1 , wherein Step 1 of knocking on different positions of the detected object through the vibration excitation device to obtain data for a plurality of knocks which comprise the incident signal and the vibration signal comprises:

performing free-fall knocking on different positions of the detected object by a vibration excitation rod, or directly knocking different positions of the detected object by a vibration excitation hammer; collecting the incident signal by the first sensor, and collecting the vibration signal by the second sensor, wherein a position knocked by the vibration excitation device is close to the second sensor, and a distance from the position knocked by the vibration excitation device to the second sensor is not more than one quarter of a thickness of the detected object.

5 . The elastic wave radar detection method according to claim 2 , wherein Step 1 of knocking on different positions of the detected object through the vibration excitation device to obtain data for a plurality of knocks which comprise the incident signal and the vibration signal comprises:

performing free-fall knocking on different positions of the detected object by a vibration excitation rod, or directly knocking different positions of the detected object by the vibration excitation hammer; collecting the incident signal by the first sensor, and collecting the vibration signal by the second sensor, wherein a position knocked by the vibration excitation device is close to the second sensor, and a distance from the position knocked by the vibration excitation device to the second sensor is not more than one quarter of a thickness of the detected object.

6 . The elastic wave radar detection method according to claim 3 , wherein Step 1 of knocking on different positions of the detected object through the vibration excitation device to obtain data for a plurality of knocks which comprise the incident signal and the vibration signal comprises:

performing free-fall knocking on different positions of the detected object by the vibration excitation rod, or directly knocking different positions of the detected object by a vibration excitation hammer; collecting the incident signal by the first sensor, and collecting the vibration signal by the second sensor, wherein a position knocked by the vibration excitation device is close to the second sensor, and a distance from the position knocked by the vibration excitation device to the second sensor is not more than one quarter of a thickness of the detected object.

7 . The elastic wave radar detection method according to claim 4 , wherein Step 2 of processing the incident signal to obtain the standard incident signal comprises:

the standard incident signal comprising a first vibration excitation standard wave, an average standard wave, a maximum-minimum intercepted standard wave and a minimum-maximum intercepted standard wave; collecting an incident signal waveform of a first knock, and taking a start point and an end point of the incident signal waveform of the first knock as a start point and an initial point of a standard sinusoidal half wave with an amplitude of 1 to obtain the first vibration excitation standard wave; collecting incident signal waveforms of all knocks, taking an average value of start points and an average value of end points of the incident signal waveforms of all knocks as a start point and an end point of a standard sinusoidal half wave with an amplitude of 1 to obtain the average standard wave; taking the maximum value of the start points and the minimum value of the end points of the incident signal waveforms of all knocks as a start point and an end point of a standard sinusoidal half-wave with an amplitude of 1 to obtain the maximum-minimum intercepted standard wave; and taking the minimum value of the start points and the maximum value of the end points of the incident signal waveforms of all knocks as a start point and an end point of a standard sinusoidal half wave with an amplitude of 1 to obtain the minimum-maximum intercepted standard wave.

8 . The elastic wave radar detection method according to claim 5 , wherein Step 2 of processing the incident signal to obtain the standard incident signal comprises:

the standard incident signal comprising a first vibration excitation standard wave, an average standard wave, a maximum-minimum intercepted standard wave and a minimum-maximum intercepted standard wave; collecting an incident signal waveform of a first knock, and taking a start point and an end point of the incident signal waveform of the first knock as a start point and an initial point of a standard sinusoidal half wave with an amplitude of 1 to obtain the first vibration excitation standard wave; collecting incident signal waveforms of all knocks, taking an average value of start points and an average value of end points of the incident signal waveforms of all knocks as a start point and an end point of a standard sinusoidal half wave with an amplitude of 1 to obtain the average standard wave; taking the maximum value of the start points and the minimum value of the end points of the incident signal waveforms of all knocks as a start point and an end point of a standard sinusoidal half-wave with an amplitude of 1 to obtain the maximum-minimum intercepted standard wave; and taking the minimum value of the start points and the maximum value of the end points of the incident signal waveforms of all knocks as a start point and an end point of a standard sinusoidal half wave with an amplitude of 1 to obtain the minimum-maximum intercepted standard wave.

9 . The elastic wave radar detection method according to claim 6 , wherein Step 2 of processing the incident signal to obtain the standard incident signal comprises:

the standard incident signal comprising a first vibration excitation standard wave, an average standard wave, a maximum-minimum intercepted standard wave and a minimum-maximum intercepted standard wave; collecting an incident signal waveform of a first knock, and taking a start point and an end point of the incident signal waveform of the first knock as a start point and an initial point of a standard sinusoidal half wave with an amplitude of 1 to obtain the first vibration excitation standard wave; collecting incident signal waveforms of all knocks, taking an average value of start points and an average value of end points of the incident signal waveforms of all knocks as a start point and an end point of a standard sinusoidal half wave with an amplitude of 1 to obtain the average standard wave; taking the maximum value of the start points and the minimum value of the end points of the incident signal waveforms of all knocks as a start point and an end point of a standard sinusoidal half-wave with an amplitude of 1 to obtain the maximum-minimum intercepted standard wave; and taking the minimum value of the start points and the maximum value of the end points of the incident signal waveforms of all knocks as a start point and an end point of a standard sinusoidal half wave with an amplitude of 1 to obtain the minimum-maximum intercepted standard wave.