Medical imaging system and vibration detection method and vibration detection device thereof

Abstract

The invention relates to a medical imaging system and a vibration detection method and device thereof. The vibration detection device can comprise two detection plates which form an angle with each other, and each detection plate is provided with a sensing unit which is used for sensing vibration in two directions independently from each other. The medical imaging system may include: a chassis including a fixed portion and a rotating portion mounted to the fixed portion and rotatable; and the vibration detection device is arranged on the rack. The invention further provides a vibration detection method corresponding to the vibration detection device and the medical imaging system. According to the invention, the bandwidth of the vibration sampling frequency can be obviously improved, and high-precision and low-noise sampling is realized.

Description

Technical Field

[0001] The present invention generally relates to the field of medical devices, and more particularly to medical imaging systems and their vibration detection methods and vibration detection devices. Background Art

[0002] Medical imaging systems are typically used to scan an object to be examined (such as a patient) to non-invasively obtain images reflecting the internal structure or function of the scanned object. For example, Computed Tomography (CT) devices. The currently widely used third-generation CT devices include a gantry composed of a stationary part and a rotating part. The rotating part is mounted on the stationary part and rotates at a high speed during scanning, and a vibration detection device is installed on the gantry for balance monitoring.

[0003] However, in practice, the sampling bandwidth of existing vibration detection devices cannot achieve satisfactory sampling accuracy and noise level.

[0004] Therefore, there is a great need for a new vibration detection technology applied to medical imaging systems that can improve sampling accuracy and noise level while increasing the sampling frequency bandwidth. Summary of the Invention

[0005] The present invention aims to overcome the above and / or other problems in the prior art. Through novel designs, the vibration detection method and vibration detection device of the present invention can significantly increase the sampling frequency bandwidth, achieve high-precision and low-noise sampling. Correspondingly, the medical imaging system can achieve accurate vibration detection and balance monitoring.

[0006] According to a first aspect of the present invention, there is provided a vibration detection device for a medical imaging system, which includes two detection plates that are angled to each other, and a sensing unit is installed on each detection plate for independently sensing vibrations in two directions.

[0007] According to a second aspect of the present invention, there is also provided a vibration detection method for a medical imaging system, which includes the following steps: independently sensing vibrations in two directions through sensing units installed on two detection plates that are angled to each other.

[0008] By separately installing the sensing units on two detection plates that are angled to each other, vibrations in two directions can be independently sensed, thereby significantly improving sampling accuracy while reducing the noise level. Moreover, the above design makes it possible to be compatible with sensing units having a larger sampling frequency bandwidth, thereby increasing the sampling bandwidth by thousands of times. Also, by arranging the sensing units on two detection plates, interference between the two sensing units can be avoided, which may otherwise affect the accuracy of vibration monitoring and balance detection.

[0009] Further, the above two detection plates are arranged perpendicular to each other, which enables the two sensing units to perform detection decoupled from each other.

[0010] According to a third aspect of the present invention, a medical imaging system is provided, which may include a gantry and the aforementioned vibration detection device according to the present invention. The gantry may include a fixed part and a rotating part mounted to the fixed part and rotatable. Correspondingly, in the vibration detection method of the present invention, the two detection plates can be mounted on the gantry of the medical imaging system for detecting the rotational vibration of the rotating part of the gantry.

[0011] Because the novel vibration detection device of the present invention is adopted, the sampling accuracy achieved fully meets the requirements for detecting the rotational vibration of the rotating part of the gantry of the medical imaging system. At the same time, due to the more sensitive performance, the signal-to-noise ratio is also significantly improved. In the medical imaging system of the present invention, the sampling rate of the gantry balance data has been greatly improved, which is very beneficial for monitoring the gantry balance, so as to ensure that the medical imaging system obtains high-quality images.

[0012] In the medical imaging system of the present invention, the two detection plates can be mounted on the top of the fixed part for detecting vibration signals in the X-axis direction and the Z-axis direction respectively. Correspondingly, in the vibration detection method of the present invention, the two detection plates can be mounted on the top of the fixed part for detecting vibration signals in the X-axis direction and the Z-axis direction respectively. Wherein, the Z-axis is perpendicular to the plane formed by the X-axis and the Y-axis, and the plane formed by the X-axis and the Y-axis is parallel to the rotation plane of the rotating part.

[0013] Because the vibration signal is the strongest at the top of the fixed part, mounting the two detection plates on the top of the fixed part is more conducive to signal detection.

[0014] Each of the two detection plates may further include: a first-stage differential amplification module and a second-stage low-pass module. The first-stage differential amplification module is used to amplify the signal sensed by the sensing unit. The second-stage low-pass module is used to perform low-pass filtering on the signal output by the first-stage differential amplification module. Correspondingly, the above vibration detection method may further include the following steps: amplifying the signal sensed by the sensing unit; and performing low-pass filtering on the amplified signal. Thereby, it is beneficial to extract the vibration signal caused by the rotation of the rotating part.

[0015] In the above medical imaging system, the first-stage differential amplification module may sequentially include a low-pass filter, a high-pass filter, and a signal amplifier. Correspondingly, in the above vibration detection method, the signal sensed by the sensing unit can be amplified by sequentially passing the signal through a low-pass filter, a high-pass filter, and a signal amplifier.

[0016] In the above-mentioned medical imaging system, the second-stage low-pass module may include one or more low-pass filters. Correspondingly, in the above-mentioned vibration detection method, the amplified signal may be low-pass filtered by passing the amplified signal through one or more low-pass filters.

[0017] In the above-mentioned medical imaging system, each of the two detection plates may further include: a third-stage output amplification module for output amplifying the signal low-pass filtered by the second-stage low-pass module. Correspondingly, the above-mentioned vibration detection method may further include the following step: output amplifying the low-pass filtered signal. Thereby, noise can be further removed, which is more conducive to extracting the vibration signal caused by the rotation of the rotating part.

[0018] In the above-mentioned medical imaging system, the third-stage output amplification module may sequentially include a high-pass filter, a signal amplifier, and a current limiter. Correspondingly, in the above-mentioned vibration detection method, the low-pass filtered signal may be output amplified by passing the low-pass filtered signal sequentially through a high-pass filter, a signal amplifier, and a current limiter.

[0019] Through the following detailed description in conjunction with the drawings, other features and aspects of the present invention will become clearer. Description of the Drawings

[0020] By describing the exemplary embodiments of the present invention in conjunction with the drawings, the present invention can be better understood. In the drawings:

[0021] Figure 1 is a schematic diagram of a vibration detection device according to the present invention;

[0022] Figure 2 is a schematic diagram of an embodiment of a vibration detection device according to the present invention;

[0023] Figure 3 is a schematic diagram of another embodiment of a vibration detection device according to the present invention;

[0024] Figure 4 is a schematic diagram of a medical imaging system according to the present invention;

[0025] Figure 5 is a schematic diagram of an embodiment of a medical imaging system according to the present invention;

[0026] FIG. 6(a) and FIG. 6(b) are schematic diagrams of other embodiments of a medical imaging system according to the present invention;

[0027] Figure 7 shows a schematic diagram of a vibration detection device in another embodiment of a medical imaging system according to the present invention;

[0028] Figure 8 For Figure 7 An example of signal processing in the detection board of the illustrated embodiment; and

[0029] Figure 9 A schematic diagram of a vibration detection device in another embodiment of a medical imaging system according to the present invention. Detailed implementation manners

[0030] The present invention will be further described below in conjunction with specific embodiments and the accompanying drawings. More details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention is clearly capable of being implemented in many other different ways than described herein. Those skilled in the art can make similar generalizations and deductions according to the actual application situation without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0031] Unless otherwise defined, technical terms or scientific terms used in the claims and the specification should have the ordinary meanings understood by those of ordinary skill in the technical field to which the present invention belongs. The terms "first", "second" and similar words used in the specification and claims of this application do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "a" or "an" do not denote a quantity limitation, but mean that there is at least one. Words such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalent elements, and do not exclude other elements or items. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections.

[0032] According to an embodiment of the present invention, a vibration detection device is provided.

[0033] Figure 1 A schematic diagram of a vibration detection device 100 according to the present invention. As Figure 1 shown, the vibration detection device 100 may include two detection boards 110a and 110b that are angled to each other. Sensing units 115a and 115b are respectively mounted on each of the detection boards 110a and 110b for independently sensing vibrations in two directions (for example, Figure 1 vibrations in the S1 direction and the S2 direction in, and these two directions are perpendicular to the sensing units 115a and 115b respectively).

[0034] The sensing unit can be, for example, an acceleration sensor. When an object vibrates in a certain direction, the acceleration sensor will sense the corresponding acceleration of the object, and thus the intensity of the vibration can be calculated. The acceleration sensors that can be used include piezoresistive accelerometers, capacitive accelerometers, tunneling accelerometers, optical accelerometers, piezoelectric accelerometers, etc. The acceleration sensors of the two sensing units 115a and 115b can be AC (alternating current) coupled, so that they have the same measurement reference. Finally, the acceleration sensor converts the sensed acceleration signal into a DC voltage for output. For example, if the relationship between acceleration and DC voltage is 1.35V / g, then the acceleration sensor will convert the sensed acceleration signal of 1g into a DC voltage of 1.35V for output. Similarly, if the acceleration signal is 2g, the output DC voltage will be 2.7V.

[0035] In an exemplary embodiment of the present invention, the vibration detection device adopts a three-dimensional design in which sensing units are respectively installed on two detection plates that are at an angle to each other. Compared with the existing two-dimensional design in which two acceleration sensors are installed on one detection plate, the "dimension-elevated" vibration detection device of the present invention breaks the spatial limitation of the original design. The sensing units on the two detection plates that are decoupled from each other can perform their respective detections without interference. At the same time, such a design makes it possible to accommodate sensing units with a larger sampling frequency bandwidth, thereby greatly increasing the sampling frequency bandwidth from the existing few Hz to several thousand Hz. This novel "dimension-elevated" vibration detection device of the present invention has more sensitive detection performance, and correspondingly, the signal-to-noise ratio can also be significantly improved. Compared with the situation in the prior art where when one sensor becomes loose, the other sensor will also vibrate accordingly, the two detection plates in the vibration detection device of the present invention are independent of each other. If one detection plate or the sensing unit thereon becomes loose or has other faults, it will not affect the normal operation of the other detection plate and the sensing unit installed thereon.

[0036] The detection plates 110a and 110b can be at any angle to each other, and the corresponding sensing units 115a and 115b thereon can sense vibrations in the S1 direction and the S2 direction. In some embodiments, when performing vibration detection, the direction of sensing vibration can be Figure 1 not consistent with the S1 direction and the S2 direction respectively perpendicular to the detection plates 110a and 110b as shown in Figure 2 . For example, as shown in 115a and Z 115a and X 115b and Z 115b , if the directions of vibration to be sensed are the X-axis and the Z-axis directions, at this time, the components in the X-axis and Z-axis directions can be extracted from the output signals of the sensing units 115a and 115b respectively, that is, X 115a +X115b and the vibration signal Z on the Z-axis 115a +Z 115b .

[0037] Optionally, the detection plates 110a and 110b can be set to be perpendicular to each other, as Figure 3 shown, whereby the sensing units 115a and 115b can further detect in a decoupled manner (i.e., without interfering with each other).

[0038] According to an embodiment of the present invention, a medical imaging system is further provided.

[0039] Figure 4 is a schematic diagram of the medical imaging system 400 according to the present invention. As Figure 4 shown, the medical imaging system 400 may include a housing 420, a gantry 440 installed in the housing 420 and having a scanning hole, and the above-mentioned vibration detection device 100. The gantry 440 includes a fixed part 442 and a rotating part 446 installed on the fixed part 442 and rotatable. In Figure 4 only the installation position of the vibration detection device 100 is shown in dashed lines, and it can be understood that the vibration detection device 100 can be installed on the top of the fixed part 442 as Figure 4 shown, or can be installed on the leg of the fixed part 442, or can also be installed at other positions of the gantry 440.

[0040] The medical scanning system of the present invention adopts the vibration detection device of the present invention. By enabling the sensing units to detect independently without interfering with each other, while significantly improving the sampling accuracy, it also reduces the noise level, and can also be compatible with sensing units with a larger sampling frequency bandwidth. Thus, vibration signals can be measured with a larger sampling bandwidth of up to several thousand Hz. This sampled data can greatly improve the convenience and accuracy of calculating the dynamic and static balance of the gantry, providing a more reliable guarantee for the balance monitoring of the gantry, and being beneficial for the medical imaging system to obtain high-quality images.

[0041] The acceleration sensors that can be used by the sensing units 115a and 115b in the vibration detection device 100 include one or more of piezoresistive accelerometers, capacitive accelerometers, tunneling accelerometers, optical accelerometers, piezoelectric accelerometers, etc. When used for vibration detection in the medical scanning system of the present invention, a capacitive accelerometer is preferably used because a capacitive accelerometer has the characteristics of both high sensitivity and low noise, and is more suitable for monitoring the rotational vibration of the gantry.

[0042] Optionally, in the above-mentioned medical imaging system 400, it can be as Figure 5The two detection plates 110a and 110b are installed on the top of the fixing part 442 as shown, for detecting vibration signals in the X-axis direction and the Z-axis direction respectively, where the Z-axis is perpendicular to the plane formed by the X-axis and the Y-axis, and the plane formed by the X-axis and the Y-axis is parallel to the rotation plane of the rotating part 446.

[0043] Taking a CT machine as an example, when it is working, the rotating part in the gantry rotates continuously parallel to the Figure 5 XOY plane in it, and this rotation will cause the gantry to vibrate in the X-axis direction and the Z-axis direction in Figure 5 it, thus changing the dynamic balance and / or static balance of the CT machine, which will affect the quality of the final imaging. Therefore, it is necessary to detect the vibration of the gantry in the X-axis direction and the Z-axis direction caused by the rotation of the above-mentioned rotating part. When the detection plates 110a and 110b are installed on the top of the fixing part 442 as shown in Figure 5 the vibration signals that the sensing units 115a and 115b can sense are the strongest, which is more conducive to the acquisition of vibration signals. Figure 5 The detection plates 110a and 110b in 115a are perpendicular to the X-axis and the Z-axis respectively, so the signals sampled by the sensing units 115a and 115b are directly the vibration signals in the X-axis direction and the Z-axis direction. However, it can be understood that in other embodiments, at least one of the detection plates 110a and 110b forms an inclined angle (non-90° angle) with the corresponding X-axis or Z-axis. For example, the detection plates 110a and 110b are not perpendicular to each other (as shown in Fig. 6(a)), or the detection plates 110a and 110b are perpendicular to each other but not perpendicular to the X-axis and the Z-axis respectively (as shown in Fig. 6(b)). At this time, the components in the X-axis direction and the Z-axis direction can be extracted from the output signals of the sensing units 115a and 115b as described above, that is, X 115a and Z 115b and X 115b and Z 115a +X 115b and the vibration signal Z 115a +Z 115b on the Z-axis can be obtained by superimposing them respectively.

[0044] Optionally, for the above-mentioned medical imaging system 400, the detection plates 110a and 110b may further include a first-stage differential amplification module 112a and 112b and a second-stage low-pass module 116a and 116b respectively, as shown in Figure 7As shown. The first-stage differential amplification module 112a can be used to amplify the output signal of the sensing unit 115a, and the second-stage low-pass module 116a can be used to perform low-pass filtering on the signal amplified by the first-stage differential amplification module 112a. Similarly, the first-stage differential amplification module 112b can be used to amplify the output signal of the sensing unit 115b, and the second-stage low-pass module 116b can be used to perform low-pass filtering on the signal amplified by the first-stage differential amplification module 112b.

[0045] Still taking the CT machine as an example, since the fan in the gantry also generates vibrations (with a relatively high vibration frequency) during operation, the signals output by the sensing units 115a and 115b can be processed to better extract the vibrations caused by the rotation of the rotating part. Through the processing of the above first-stage differential amplification module and second-stage low-pass module, the DC noise component in the signal can be further removed, and the signal corresponding to the vibrations caused by the rotation of the rotating part (whose frequency is relatively lower than the vibrations caused by the fan) can be effectively extracted.

[0046] Optionally, each of the first-stage differential amplification modules 112a and 112b may sequentially include a low-pass filter, a high-pass filter, and a signal amplifier.

[0047] Optionally, each of the second-stage low-pass modules 116a and 116b may include one or more low-pass filters.

[0048] Through the above first-stage differential amplification module and second-stage low-pass module of the present invention, vibration signals in a specific frequency band generated by the gantry can be provided.

[0049] Figure 8 An example of signal processing in the above detection board 110a is shown, where the sensing unit 115a is an acceleration sensor, and the low-pass filter 1162a in the second-stage low-pass module 116a includes three low-pass filters 1162a1 to 1162a3. As Figure 8As shown in, the acceleration sensor 115a, for example, senses a vibration signal of 1.35V / g (i.e., when the acceleration is 1g, the corresponding DC voltage is 1.35V), and the vibration signal passes through a low-pass filter 1122a, where the high-frequency noise is filtered or removed, for example, only signals less than or equal to K1 Hz are passed; the vibration signal then passes through a high-pass filter 1124a, where the low-frequency DC component is filtered or removed, for example, only signals greater than or equal to K2 Hz are passed; then the vibration signal passes through a signal amplifier 1126a, where the differential signal is converted into a single-ended signal; finally, the vibration signal is output from the signal amplifier 1126a, and illustratively, the output vibration signal is 50V / g (i.e., when the acceleration is 1g, the corresponding DC voltage is 50V). Afterwards, the vibration signal 50V / g (frequency between K2Hz and K1Hz) output by the first-stage differential amplifier module 112a passes through the second-stage low-pass filters 1162a1 to 1162a3 in sequence to further remove high-frequency noise in the signal.

[0050] It can be understood that the signal processing in the above-mentioned detection board 110b is similar.

[0051] Optionally, the detection boards 110a and 110b may further include third-stage output amplification modules 118a and 118b, respectively. Figure 9 As shown. The third-stage output amplifier module 118a can be used to amplify the signal output by the second-stage low-pass module 116a. Similarly, the third-stage output amplifier module 118b can be used to amplify the signal output by the second-stage low-pass module 116b. Through the processing of the third-stage output amplifier module, the DC noise component in the signal can be further removed, and the signal corresponding to the vibration caused by the rotation of the rotating part can be more effectively extracted. However, it can be understood that in some embodiments, the signal processed by the aforementioned first-stage differential amplifier module and the second-stage low-pass module has effectively filtered or eliminated the signals of other vibration sources except the rotational vibration of the rotating part, and the third-stage output amplifier module may not be required.

[0052] Optionally, the third-stage output amplification modules 118 a and 118 b may each include a high-pass filter, a signal amplifier, and a current limiter in sequence.

[0053] Still Figure 8The signal processing in the above detection board 110a is described by way of example. The vibration signals output by the second-stage low-pass filters 1162a1 to 1162a3 are transmitted to the high-pass filter 1182a to further remove the low-frequency DC components in the vibration signals, and then transmitted to the signal amplifier 1184a, the gain of which is, for example, 8. The vibration signal output thereby is 400V / g (that is, when the acceleration is 1g, the corresponding DC voltage is 400V). The vibration signal output by the signal amplifier 1184a is further transmitted to the current limiter 1186a, which can prevent the finally output voltage signal from damaging subsequent other processing circuits for calculating dynamic and static balance, etc. For example, the current limiting voltage is ±1V, that is, the voltage finally output from the third-stage output amplification module 118a does not exceed ±1V.

[0054] According to an embodiment of the present invention, there is also provided a vibration detection method accordingly, which may include the following step S0: independently sense vibrations in two directions respectively through the sensing units mounted on two detection boards that are at an angle to each other.

[0055] Optionally, the above two detection boards may be perpendicular to each other.

[0056] Optionally, the two detection boards may be mounted on the gantry of the medical imaging system for detecting the rotational vibration of the rotating part of the gantry.

[0057] Optionally, the two detection boards may be mounted on the top of the fixed part of the gantry for respectively detecting the vibration signals in the X-axis direction and the Z-axis direction, wherein the Z-axis is perpendicular to the plane formed by the X-axis and the Y-axis, and the plane formed by the X-axis and the Y-axis is parallel to the rotation plane of the rotating part.

[0058] Optionally, the vibration detection method may further include steps S1 and S2. In S1, the signals sensed by the sensing unit are amplified. In S2, the amplified signals are low-pass filtered.

[0059] Optionally, in step S1, the sensed signals may be amplified by sequentially passing the signals sensed by the sensing unit through a low-pass filter, a high-pass filter, and a signal amplifier.

[0060] Optionally, in step S2, the amplified signals may be low-pass filtered by passing the amplified signals through one or more low-pass filters.

[0061] Optionally, the vibration detection method may further include step S3: output-amplify the low-pass filtered signals.

[0062] Optionally, in step S3, the low-pass filtered signal can be output and amplified by sequentially passing the low-pass filtered signal through a high-pass filter, a signal amplifier, and a current limiter.

[0063] The above vibration detection method corresponds exactly to the vibration detection device and the medical imaging system according to the present invention described above. Many design concepts and details applicable in the vibration detection device and the medical imaging system of the present invention also apply to the above vibration detection method, and the same beneficial technical effects can be obtained, which will not be elaborated here.

[0064] The various aspects of the present invention have been described above through some exemplary embodiments. However, it should be understood that various modifications can be made to the above exemplary embodiments without departing from the spirit and scope of the present invention. For example, if the described technology is executed in a different order and / or if the components in the described system, architecture, device, or circuit are combined in a different manner and / or replaced or supplemented by other components or their equivalents, appropriate results can also be achieved. Accordingly, these modified other embodiments also fall within the protection scope of the claims.

Claims

1. A vibration detection device for a medical imaging system, comprising: Two detection plates angled to each other, with a sensing unit installed on each detection plate for independently sensing vibrations in two directions.

2. The vibration detection device according to claim 1, wherein The two detection plates are perpendicular to each other.

3. A medical imaging system, comprising: A gantry, which includes a fixed part and a rotatable rotating part mounted to the fixed part; And The vibration detection device according to claim 1 or 2 mounted on the gantry.

4. The medical imaging system according to claim 3, wherein The two detection plates are mounted on the top of the fixed part for respectively detecting vibration signals in the X-axis direction and the Z-axis direction, wherein the Z-axis is perpendicular to the plane formed by the X-axis and the Y-axis, and the plane formed by the X-axis and the Y-axis is parallel to the rotation plane of the rotating part.

5. The medical imaging system according to claim 3 or 4, characterized in that, Each of the two detection plates further includes: A first-stage differential amplification module for amplifying the signal sensed by the sensing unit; and A second-stage low-pass module for performing low-pass filtering on the signal output by the first-stage differential amplification module.

6. The medical imaging system according to claim 5, wherein, The first-stage differential amplification module sequentially includes a low-pass filter, a high-pass filter, and a signal amplifier.

7. The medical imaging system according to claim 5, wherein The second-stage low-pass module includes one or more low-pass filters.

8. The medical imaging system according to claim 5, wherein Each of the two detection plates further includes: A third-stage output amplification module for performing output amplification on the signal low-pass filtered by the second-stage low-pass module.

9. The medical imaging system according to claim 8, wherein The third-stage output amplification module sequentially includes a high-pass filter, a signal amplifier, and a current limiter.

10. A vibration detection method for a medical imaging system, comprising the following steps: Independently sensing vibrations in two directions through sensing units installed on two detection plates angled to each other.

11. The vibration detection method according to claim 10, characterized in that, The two detection plates are perpendicular to each other.

12. The vibration detection method according to claim 10, wherein, Mounting the two detection plates on the gantry of the medical imaging system for detecting the rotational vibration of the rotating part of the gantry.

13. The vibration detection method according to claim 12, characterized in that, Mounting the two detection plates on the top of the fixed part of the gantry for respectively detecting vibration signals in the X-axis direction and the Z-axis direction, wherein the Z-axis is perpendicular to the plane formed by the X-axis and the Y-axis, and the plane formed by the X-axis and the Y-axis is parallel to the rotation plane of the rotating part.

14. The vibration detection method according to claim 12 or 13, further comprising the following steps: Amplifying the signal sensed by the sensing unit; and Performing low-pass filtering on the amplified signal.

15. The vibration detection method according to claim 14, characterized in that, Amplifying the sensed signal by sequentially passing the signal sensed by the sensing unit through a low-pass filter, a high-pass filter, and a signal amplifier.

16. The vibration detection method according to claim 14, wherein Performing low-pass filtering on the amplified signal by passing the amplified signal through one or more low-pass filters.

17. The vibration detection method according to claim 12 or 13, further comprising: Performing output amplification on the low-pass filtered signal.

18. The vibration detection method according to claim 17, characterized in that, Performing output amplification on the low-pass filtered signal by sequentially passing the low-pass filtered signal through a high-pass filter, a signal amplifier, and a current limiter.

Images