Acoustic emission sensor mounting seat and split type acoustic emission sensor

Abstract

The utility model discloses an acoustic emission sensor mounting seat and a split type acoustic emission sensor, the mounting seat comprises a top plate, a first support plate and a second support plate, the first support plate and the second support plate are respectively arranged at two ends of the top plate, and a mounting area is formed among the first support plate, the second support plate and the top plate; the connecting shaft penetrates to the mounting area from the side, away from the mounting area, of the top plate, and a mounting cap is arranged at the end, located in the mounting area, of the connecting shaft and used for mounting an acoustic emission sensor; the end, away from the top plate, of the first support plate and the end, away from the top plate, of the second support plate are provided with magnetic bodies which are used for being magnetically attracted to an object to be detected. The mounting cap is arranged on the mounting seat and used for mounting the acoustic emission sensor, the magnetic body is arranged at one end of the first support plate and one end of the second support plate and can be directly magnetically attracted to a to-be-detected object, the acoustic emission sensor can be in contact with the to-be-detected object by adjusting the vertical position of the connecting shaft, and the mounting process is convenient.

Description

Technical Field

[0001] The present application relates to the field of acoustic emission sensors, and in particular to an acoustic emission sensor mounting base and a split acoustic emission sensor. Background Art

[0002] The split acoustic emission sensor needs to be installed on the surface of the object to be detected during operation to emit and / or receive acoustic emissions to the object to be detected. However, the current split stress sensor is inconvenient to install the acoustic emission sensor at the detection position of the object to be detected.

[0003] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Utility Model Content

[0004] The main purpose of the present application is to provide an acoustic emission sensor mounting base and a split acoustic emission sensor, aiming to solve the problem of inconvenient installation of the split acoustic emission sensor mentioned in the background technology.

[0005] To achieve the above objectives, the present application provides an acoustic emission sensor mounting base, comprising:

[0006] A top plate, a first support plate and a second support plate, wherein the first support plate and the second support plate are respectively arranged at two ends of the top plate, and the first support plate and the second support plate both extend to the same side of the top plate, so that a sensor installation area is formed between the first support plate, the second support plate and the top plate, and the top plate is provided with a mounting hole, and the mounting hole is connected to the mounting area;

[0007] A connecting shaft, the connecting shaft passes through the mounting hole from a side of the top plate away from the mounting area to the mounting area, the connecting shaft is slidably arranged in the mounting hole along its axial direction, and a mounting cap is provided at one end of the connecting shaft located in the mounting area, and the mounting cap is used to mount the acoustic emission sensor;

[0008] One end of the first support plate away from the top plate and one end of the second support plate away from the top plate are both provided with magnetic bodies, and the magnetic bodies are used for magnetic attraction on the object to be detected.

[0009] In the embodiment of the present application, the ends of the first support plate and the second support plate away from the top plate are located in the same horizontal plane.

[0010] In an embodiment of the present application, a first mounting groove is provided at one end of the first support plate away from the top plate, and a second mounting groove is provided at one end of the second support plate away from the top plate. Both the first mounting groove and the second mounting groove are used to install the magnetic body.

[0011] In an embodiment of the present application, a magnet seat is provided at one end of the first support plate away from the top plate and at one end of the second support plate away from the top plate, and the magnet seat is provided with a third mounting groove, and both of the third mounting grooves are used to mount the magnetic body.

[0012] In the embodiment of the present application, an elastic member is sleeved on the connecting shaft, one end of the elastic member abuts against the mounting cap, and the other end abuts against the plate surface of the top plate located in the mounting area;

[0013] A limiting assembly is provided at one end of the connecting shaft outside the installation area;

[0014] After the acoustic emission sensor is installed on the mounting cap, when the detection end of the acoustic emission sensor contacts the object to be detected in the free state of the elastic member, the detection end of the acoustic emission sensor passes over the first support plate and the second support plate away from one end of the top plate.

[0015] The present application also provides a split acoustic emission sensor, comprising: the acoustic emission sensor mounting base described in any one of the above embodiments; and

[0016] An acoustic emission sensor, the acoustic emission sensor being arranged in a mounting cap of the acoustic emission sensor mounting seat;

[0017] A coaxial cable, wherein the SMA male terminal of the coaxial cable is used to electrically connect to the SMA female terminal of the acoustic emission sensor,

[0018] A signal processor, wherein the BNC female terminal of the signal processor is used to be electrically connected to the BNC male terminal of the coaxial cable, and the signal processor is used to process the signal collected by the acoustic emission sensor.

[0019] In an embodiment of the present application, the signal processor includes a bandpass filtering circuit and an amplifying circuit.

[0020] The present application arranges a mounting cap on the mounting seat so that the acoustic emission sensor can be arranged inside the mounting cap, and arranges a magnetic body at one end of the first support plate and the second support plate away from the top plate, so that when the object to be detected is magnetic, the magnetic body can be directly magnetically attracted to the object to be detected, thereby fixing the entire mounting seat on the object to be detected; in addition, the connecting shaft can slide in the mounting hole, so that the position of the connecting shaft can be adjusted to make the acoustic emission sensor contact with the object to be detected, and the installation process is relatively convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of an acoustic emission sensor mounting base according to an embodiment of the present application;

[0022] Figure 2A side view of an acoustic emission sensor mounting base according to an embodiment of the present application;

[0023] Figure 3 A side view of an acoustic emission sensor mounting base according to another embodiment of the present application;

[0024] Figure 4 A schematic diagram of a split acoustic emission sensor according to an embodiment of the present application;

[0025] Figure 5 FIG. 1 is a schematic diagram of a split acoustic emission sensor according to another embodiment of the present application.

[0026] Figure Number:

[0027] 100-top plate, 110-mounting hole, 120-acoustic emission sensor, 200-first support plate, 210-first mounting slot, 300-second support plate, 310-second mounting slot, 400-mounting area, 500-connecting shaft, 510-mounting cap, 520-elastic member, 530-limiting assembly, 600-magnetic body, 700-magnet seat, 710-third mounting slot, 800-ceramic sheet, 810-piezoelectric ceramic, 820-connecting wire, 830-housing, 840-SMA terminal female, 850-SMA terminal male, 860-coaxial cable, 870-BNC terminal male, 880-nut, 890-gasket, 900-BNC terminal female, 910-circuit board, 920-upper cover, 930-lower cover, 940-end cover, 950-signal processor. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0031] like Figure 1 , Figure 2 As shown, this exemplary embodiment provides an acoustic emission sensor mounting seat, comprising: a top plate 100, a first support plate 200 and a second support plate 300, wherein the first support plate 200 and the second support plate 300 are respectively arranged at two ends of the top plate 100, and the first support plate 200 and the second support plate 300 both extend to the same side of the top plate 100, so that a sensor mounting area 400 is formed between the first support plate 200, the second support plate 300 and the top plate 100, and the top plate 100 is provided with a mounting hole 110, and the mounting hole 110 is connected to the mounting area 400;

[0032] A connecting shaft 500, the connecting shaft 500 passes through the mounting hole 110 from the side of the top plate 100 away from the mounting area 400 to the mounting area 400, the connecting shaft 500 is arranged in the mounting hole 110 with delayed axial sliding, and a mounting cap 510 is provided at one end of the connecting shaft 500 located in the mounting area 400, and the mounting cap 510 is used to mount the acoustic emission sensor 120;

[0033] A magnetic body 600 is disposed at one end of the first support plate 200 away from the top plate 100 and at one end of the second support plate 300 away from the top plate 100. The magnetic body 600 is used for magnetically attracting the object to be detected.

[0034] like Figure 1 As shown, in the embodiment of the present application, the top plate 100 can be roughly a rectangular plate, the first support plate 200 and the second support plate 300 can also be rectangular plates, and the first support plate 200 and the second support plate 300 are vertically downward from both ends of the top plate 100 in the length direction ( Figure 1The semi-enclosed area (shaped like a downward groove) enclosed between the first support plate 200, the second support plate 300 and the top plate 100 is the installation area 400 of the acoustic emission sensor 120. The semi-enclosed installation area 400 refers to the bottom surface direction of the top plate 100, and the side between the first support plate 200 and the second support plate 300 is not enclosed, so that the acoustic emission sensor 120 can be easily installed in the installation area 400.

[0035] In addition, in other embodiments, the top plate 100 may also be in other shapes, such as a circular flat plate, and the corresponding first support plate 200 and the second support plate 300 may be arc-shaped plates, which extend vertically downward from the edge of the circular top plate 100 and are roughly cylindrical, so that the arc-shaped first support plate 200 and the second support plate 300 and the top plate 100 may also enclose a semi-enclosed area to serve as the installation area 400 of the acoustic emission sensor 120. It should be noted that if the top plate 100 is a circular flat plate, the first support plate 200 and the second support plate 300 are arc-shaped plates, the first support plate 200 and the second support plate 300 may be arranged opposite to each other along the radial direction of the circular top plate 100, and the first support plate 200 and the second support plate 300 are not closed in the circumferential direction of the arc-shaped top plate 100, so that the semi-enclosed installation area 400 formed by the enclosed formation can also facilitate the installation of the acoustic emission sensor 120.

[0036] like Figure 1 , Figure 2 As shown, the mounting hole 110 can be located in the middle of the top plate 100, and the connecting shaft 500 passes through the mounting hole 110 from the upper end of the top plate 100 and enters the mounting area 400. The lower end of the connecting shaft 500, that is, the end located in the mounting area 400, is provided with a mounting cap 510. The mounting cap 510 is roughly cylindrical, hollow inside, and open at the bottom. The acoustic emission sensor 120 is mostly cylindrical. The inner diameter of the bottom opening of the mounting cap 510 can be roughly equivalent to the outer diameter of the acoustic emission sensor 120. At the same time, an anti-slip material can be provided on the inner side wall of the mounting cap 510, so that the acoustic emission sensor 120 can be firmly set inside the mounting cap 510 from the opening at the bottom. In addition, the connecting shaft 500 can slide in the mounting hole 100, so that the position of the acoustic emission sensor 120 located in the mounting cap 510 can be adjusted by sliding the connecting shaft 500, so as to facilitate adaptation with the object to be detected.

[0037] The first support plate 200 and the second support plate 300 are away from one end of the top plate 100 ( Figure 1 , 2, 3) is provided with a magnetic body 600. When the object to be detected is magnetic, the magnetic body 600 can be directly attracted to the object to be detected. When the magnetic body 600 is attracted to the object to be detected, the entire mounting base is fixed on the object to be detected. By adjusting the upper and lower positions of the connecting shaft 500, the acoustic emission sensor 120 located in the mounting area 400 can be brought into contact with the object to be detected, and then detection can be performed, which makes the installation process convenient. It should be noted that Figure 1 , 2 In the orientation shown in 3, the acoustic emission sensor mounting base is installed on the object to be detected from top to bottom. In other embodiments, the acoustic emission sensor mounting base can also be installed in a horizontal direction, an inclined direction, or from bottom to top on the object to be detected, and the specific adjustment direction of the connecting shaft 500 is based on the actual installation direction.

[0038] In addition, in other embodiments, the first support plate 200 and the second support plate 300 may be provided at one end ( Figure 1 , 2 , 3) is provided with a vacuum suction cup. When the detection surface of the object to be detected has a certain flatness, the vacuum suction cup can be directly adsorbed on the detection surface of the object to be detected. In another embodiment, the first support plate 200 and the second support plate 300 can also be provided at one end ( Figure 1 , 2 , and a clamping assembly is provided at the lower end in the orientation shown in FIG. 3 , and the acoustic emission sensor mounting base can be mounted on the object to be detected by clamping using the clamping assembly.

[0039] When the magnetic body 600 is disposed at one end of the first support plate 200 and the second support plate 300 away from the top plate 100, the magnetic body 600 can also be installed at the lower end of the first support plate 200 and the second support plate 300 in various ways. Figure 3As shown, in the embodiment of the application, the first mounting groove 210 is provided at one end of the first support plate 200 away from the top plate 100, and the second mounting groove 310 is provided at one end of the second support plate 300 away from the top plate 100, and the magnetic body 600 is provided in both the first mounting groove 210 and the second mounting groove 310. In the embodiment of the present application, the first mounting groove 210 and the second mounting groove 310 are directly grooved on the bottom end of the corresponding support plate, and the depth of the two mounting grooves in the vertical direction is less than the height of the magnetic body 600 in the vertical direction, so that when the magnetic body 600 is installed into the first mounting groove 210 and the second mounting groove 310, it can be exposed from the mounting groove, which is convenient for magnetic attraction with the object to be detected. In addition, it should be noted that it is also necessary to ensure that after the magnetic body 600 is installed into the first support plate 200 and the second support plate 300, the lower ends of the two magnetic bodies 600 are located on the same horizontal plane, that is, to ensure that the two ends of the mounting seat can be balanced and adsorbed on the object to be detected.

[0040] In addition, the magnetic body 600 may be installed in the first installation groove 210 and the second installation groove 310 in an interference fit manner, or may be installed in the first installation groove 210 and the second installation groove 310 in a threaded connection manner.

[0041] For example, in another embodiment, Figure 1 , Figure 2 As shown, the end of the first support plate 200 away from the top plate 100 and the end of the second support plate 300 away from the top plate 100 are both provided with a magnet seat 700, and the magnet seat 700 is provided with a third mounting groove 710, and the two third mounting grooves 710 are used to install the magnetic body 600. Figure 1 and Figure 2 As shown, in the embodiment of the present application, the magnet seat 700 can be fixedly arranged at the lower end of the first support plate 200 and the second support plate 300, such as by gluing, threading, etc. Specifically, in one embodiment, the magnetic body 600 can be glued to the lower end of the first support plate 200 and the second support plate 300, and the magnetic body 600 can be installed in the third installation groove 710 by interference fit. In other embodiments, threaded holes can be provided at the lower end of the first support plate 200, the second support plate 300, and the magnet seat 700 and the magnetic body 600, and the magnet seat 700 and the magnetic body 600 can be installed at the lower end of the first support plate 200 and the second support plate 300 by threading.

[0042] like Figure 2 , Figure 3 As shown, in the embodiment of the present application, an elastic member 520 is sleeved on the connecting shaft 500, one end of the elastic member 520 abuts against the mounting cap 510, and the other end abuts against the plate surface of the top plate 100 located in the mounting area 400;

[0043] A stopper assembly 530 is provided at one end of the connecting shaft 500 outside the installation area 400;

[0044] After the acoustic emission sensor 120 is installed on the mounting cap 510 , when the detection end of the acoustic emission sensor 120 contacts the object to be detected in the free state of the elastic member 520 , the detection end of the acoustic emission sensor 120 passes over the first support plate 200 and the second support plate 300 and is away from one end of the top plate 100 .

[0045] Specifically, as 2, Figure 3 As shown, the elastic member 520 can be a spring, the upper end of which abuts against the lower plate surface of the top plate 100, and the lower end abuts against the upper end surface of the mounting cap 510. The acoustic emission sensor 120 is installed in the mounting cap 510. When the mounting base is placed on the object to be detected, when the magnetic body 600 is not magnetically attracted to the object to be detected, the lower end of the acoustic emission sensor 120 contacts the object to be detected. Under the gravity of the top plate 100, the first support plate 200 and the second support plate 300, the elastic member 520 is slightly compressed, and the top plate 100 is pressed downward. The magnetic body 600 approaches the object to be detected, and the magnetic force between the magnetic body 600 and the object to be detected magnetically attracts the magnetic body 600 to the object to be detected. At this time, the elastic member 520 is further compressed by the magnetic force between the magnetic body 600 and the object to be detected, and the elastic force of the elastic member 520 supports the acoustic emission sensor 120 to be firmly in contact with the object to be detected. This arrangement not only enables the mounting base to be quickly mounted on the object to be detected, but also enables the acoustic emission sensor 120 to be firmly fixed on the object to be detected, thereby ensuring good contact between the acoustic emission sensor 120 and the object to be detected during detection.

[0046] In the embodiment of the present application, by providing a mounting cap 510 on the mounting base, the acoustic emission sensor 120 can be arranged in the mounting cap 510, and by providing a magnetic body 600 at one end of the first support plate 200 and the second support plate 300 away from the top plate 100, when the object to be detected is magnetic, the magnetic body 600 can be directly magnetically attracted to the object to be detected, thereby fixing the entire mounting base on the object to be detected; in addition, the connecting shaft 500 can slide in the mounting hole 110, so that the position of the connecting shaft 500 can be adjusted, so that the acoustic emission sensor 120 located in the mounting area 400 can be in contact with the object to be detected, and the installation process is relatively convenient.

[0047] like Figure 4 , Figure 5 As shown, the present application also proposes a split acoustic emission sensor, comprising a mounting seat in any of the above-mentioned acoustic emission sensor mounting seat embodiments, and

[0048] An acoustic emission sensor 120, the acoustic emission sensor 120 is used to be arranged in the mounting cap 510 of the acoustic emission sensor mounting seat;

[0049] A coaxial cable 860, wherein the SMA male terminal 850 of the coaxial cable 860 is used to be electrically connected to the SMA female terminal 840 on the acoustic emission sensor 120,

[0050] The signal processor 950 has a BNC female terminal 900 which is electrically connected to the BNC male terminal 870 of the coaxial cable 860 . The signal processor 950 is used to process the signal collected by the acoustic emission sensor 120 .

[0051] The installation method of the acoustic emission sensor 120 and the mounting base can be referred to the specific implementation of the acoustic emission sensor mounting base mentioned above, and will not be described in detail here.

[0052] The acoustic emission sensor 120 and the signal processor 950 are connected via a coaxial cable 860, as shown in FIG. Figure 5 As shown, the acoustic emission sensor 120 includes a ceramic sheet 800, a piezoelectric ceramic 810, a connecting wire 820, and a housing 830. The piezoelectric ceramic 810 and the connecting wire 820 are arranged in the housing 830. The ceramic sheet 800 is arranged at the bottom of the piezoelectric ceramic 810 to protect the piezoelectric ceramic 810. One end of the connecting wire 820 is electrically connected to the piezoelectric ceramic 810, and the other end is connected to the SMA terminal female head 840 on the housing 830. The SMA terminal male head 850 of the coaxial cable 860 is electrically connected to the SMA female and male heads on the housing 830. The SMA male and female heads on the coaxial cable 860 are electrically connected to the BNC terminal female head 900 on the signal processor 950 through a nut 880 and a gasket 890. The BNC terminal female head 900 is electrically connected to the circuit board 910 inside the signal processor 950.

[0053] The propagation of acoustic emission is essentially the movement of particles (transverse waves, longitudinal waves, surface waves, etc.). When the movement of particles is transmitted to the contact surface of the acoustic emission sensor 120, it drives the protons on the piezoelectric ceramic 810 to move, producing compression and stretching effects on the piezoelectric ceramic 810, thereby converting the acoustic emission signal into a voltage signal. In addition, since the voltage of the output signal of the front-end piezoelectric ceramic 810 is generally low (as low as the order of microvolts), if such a weak signal is transmitted over a long distance, the signal-to-noise ratio will inevitably decrease. Therefore, the circuit board 910 in the signal processor 950 can be integrated with a bandpass filter circuit and an amplifier circuit to denoise and amplify the signal, and then output the amplified signal to facilitate subsequent analysis.

[0054] Continue to refer to Figure 5In the embodiment of the present application, the signal processor 950 further includes an upper cover 920, a lower cover 930 and two end covers 940. The upper cover 920 and the lower cover 930 are arranged relative to each other, for example, they can form a cavity structure with two openings at both ends by means of a snap connection. The two end covers 940 can be threadedly connected with the upper cover 920 and the lower cover 930. The circuit board 910 can be arranged in the cavity enclosed by the upper cover 920, the lower cover 930 and the two end covers 940. In addition, a card slot can be arranged on the inner side wall of the upper cover 920 and the lower cover 930, and the circuit board 910 can be plugged into the card slot for easy installation and removal.

[0055] The split acoustic emission sensor in the embodiment of the present application can quickly fix the acoustic emission sensor at the detection position of the object to be detected by using the acoustic emission sensor mounting seat, which is convenient for users to use.

[0056] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An acoustic emission sensor mounting base, characterized in that: include: A top plate, a first support plate and a second support plate, wherein the first support plate and the second support plate are respectively arranged at two ends of the top plate, and the first support plate and the second support plate both extend to the same side of the top plate, so that a sensor installation area is formed between the first support plate, the second support plate and the top plate, and the top plate is provided with a mounting hole, and the mounting hole is connected to the mounting area; A connecting shaft, the connecting shaft passes through the mounting hole from a side of the top plate away from the mounting area to the mounting area, the connecting shaft is slidably arranged in the mounting hole along its axial direction, and a mounting cap is provided at one end of the connecting shaft located in the mounting area, and the mounting cap is used to mount the acoustic emission sensor; One end of the first support plate away from the top plate and one end of the second support plate away from the top plate are both provided with magnetic bodies, and the magnetic bodies are used for magnetic attraction on the object to be detected.

2. The acoustic emission sensor mounting base according to claim 1, characterized in that: The ends of the first support plate and the second support plate away from the top plate are located in the same horizontal plane.

3. The acoustic emission sensor mounting base according to claim 1, characterized in that: A first mounting groove is provided at one end of the first support plate away from the top plate, and a second mounting groove is provided at one end of the second support plate away from the top plate. Both the first mounting groove and the second mounting groove are used to mount the magnetic body.

4. The acoustic emission sensor mounting base according to claim 3, characterized in that: One end of the first support plate away from the top plate and one end of the second support plate away from the top plate are both provided with a magnet seat, and the magnet seat is provided with a third mounting groove, and the two third mounting grooves are both used to install the magnetic body.

5. The acoustic emission sensor mounting base according to claim 1, characterized in that: An elastic member is sleeved on the connecting shaft, one end of the elastic member abuts against the mounting cap, and the other end abuts against the plate surface of the top plate located in the mounting area; A limiting assembly is provided at one end of the connecting shaft outside the installation area; After the acoustic emission sensor is installed on the mounting cap, when the detection end of the acoustic emission sensor contacts the object to be detected in the free state of the elastic member, the detection end of the acoustic emission sensor passes over the first support plate and the second support plate away from one end of the top plate.

6. A split acoustic emission sensor, characterized in that: include: The acoustic emission sensor mounting base as described in any one of claims 1 to 5; as well as An acoustic emission sensor, the acoustic emission sensor being arranged in a mounting cap of the acoustic emission sensor mounting seat; A coaxial cable, wherein the SMA male terminal of the coaxial cable is used to electrically connect to the SMA female terminal of the acoustic emission sensor, A signal processor, wherein the BNC female terminal of the signal processor is used to be electrically connected to the BNC male terminal of the coaxial cable, and the signal processor is used to process the signal collected by the acoustic emission sensor.

7. The split acoustic emission sensor according to claim 6, characterized in that: The signal processor includes a bandpass filtering circuit and an amplifying circuit.

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