CN112826492B - Vibration sensor and medical imaging apparatus - Google Patents
Vibration sensor and medical imaging apparatus Download PDFInfo
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- CN112826492B CN112826492B CN202011595876.7A CN202011595876A CN112826492B CN 112826492 B CN112826492 B CN 112826492B CN 202011595876 A CN202011595876 A CN 202011595876A CN 112826492 B CN112826492 B CN 112826492B
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- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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Abstract
The present invention relates to a vibration sensor and a medical imaging apparatus. The vibration sensor includes: an installation unit; the light adjusting unit is movably arranged relative to the mounting unit and can move relative to the mounting unit along with vibration of the mounting unit; the optical unit is arranged corresponding to the dimming unit, can transmit optical signals to the dimming unit and receives the optical signals reflected by the dimming unit; wherein the light signal reflected by the dimming unit is associated with a movement amount of the mounting unit, and the dimming unit adjusts the reflection of the corresponding light signal to the optical unit in response to vibration of the mounting unit. The vibration sensor is based on an optical principle, and acquires a vibration signal of the vibration source by acquiring a light signal corresponding to a dimming unit related to the vibration source.
Description
Technical Field
The invention relates to the technical field of vibration sensors of medical equipment, in particular to a vibration sensor and medical imaging equipment.
Background
Medical imaging devices often have relatively strong vibrations in use, which on the one hand can generate relatively large noise and on the other hand permanent vibrations place higher demands on the stability and reliability of the mounting of other components in the magnetic resonance system.
The current medical imaging equipment has the characteristics of high magnetic field, high radio frequency field and the like. The existing electric vibration sensor applied to the medical imaging equipment is easy to generate larger interference signals due to the coupling of electronic devices or electric lead wires, and is easy to cause the distortion of acquired signals of the medical imaging equipment and even cause the damage of the vibration sensor devices, so that the operation imaging quality and stability of the medical imaging equipment are affected.
Disclosure of Invention
In view of the above, it is necessary to provide a modified vibration sensor and medical imaging apparatus. The vibration sensor is based on an optical principle, and acquires a vibration signal of the vibration source by acquiring a light signal corresponding to a dimming unit related to the vibration source. The medical imaging equipment with the vibration sensor can take timely measures after the vibration signals of all the internal positions are acquired, such as active noise reduction, overhaul parts and the like, so that the medical imaging equipment can run more smoothly.
A vibration sensor, the vibration sensor comprising:
an installation unit;
the light adjusting unit is movably arranged relative to the mounting unit and can move relative to the mounting unit along with vibration of the mounting unit;
the optical unit is arranged corresponding to the dimming unit, can transmit optical signals to the dimming unit and receives the optical signals reflected by the dimming unit;
wherein the light signal reflected by the dimming unit is associated with a movement amount of the mounting unit, and the dimming unit adjusts the reflection of the corresponding light signal to the optical unit in response to vibration of the mounting unit.
Further, the optical unit comprises an incident signal optical fiber, a reflected signal optical fiber and a photoelectric conversion element, wherein the incident signal optical fiber is used for transmitting an incident light signal to the dimming unit, and the reflected signal optical fiber is used for transmitting the light signal reflected by the dimming unit to the photoelectric conversion element;
the photoelectric conversion element is connected to one end of the reflection signal optical fiber, which is far away from the dimming unit, and converts the optical signal transmitted by the reflection signal optical fiber into an electric signal.
Further, the incident signal optical fibers and the reflected signal optical fibers are plural, and the incident signal optical fibers and the reflected signal optical fibers are clustered.
Further, the optical unit includes a first end facing the dimming unit, and a plurality of incident signal fibers and reflection signal fibers located at the first end are mixed with each other and arranged at intervals.
Further, one end of the incident light signals far away from the dimming unit and one end of the reflection signal optical fibers far away from the dimming unit are respectively clustered.
Further, the optical unit includes a first end disposed towards the light modulation unit, the light modulation unit is slidably disposed on the mounting unit, and when the light modulation unit slides relative to the mounting unit, an effective reflection area of the light modulation unit projected on an end surface of the first end is correspondingly changed.
Further, the dimming unit comprises a light reflecting part and a light absorbing part, wherein the light reflecting part is used for reflecting the light signal, and the light absorbing part is used for inhibiting the reflection of the light signal;
the light reflecting part and the light absorbing part are arranged on the mounting unit in a sliding manner, and when the light reflecting part and the light absorbing part slide relative to the mounting unit, the area of the light reflecting part corresponding to the optical unit and the area of the light absorbing part corresponding to the optical unit are correspondingly changed;
the area of the light reflecting part corresponding to the optical unit and the area of the light absorbing part corresponding to the optical unit are effective reflection areas projected on the end face of the first end by the dimming unit.
Further, the light reflecting portion and the light absorbing portion are arranged along a sliding direction of the light adjusting unit.
Further, the vibration sensor further comprises a light collimator arranged at the first end, the light collimator is connected with the incident signal optical fiber and the reflected signal optical fiber and is relatively close to one end of the dimming unit, and the light collimator and the dimming unit are relatively arranged.
Further, the number of the dimming units is multiple, the optical units are arranged in one-to-one correspondence with the dimming units, and the moving direction of each dimming unit relative to the mounting unit is different.
Further, the mounting unit is provided with a slide rail corresponding to the dimming units, and each dimming unit is slidably arranged on the corresponding slide rail.
Further, the vibration sensor further comprises a reset unit, wherein the reset unit is respectively connected with the mounting unit and the dimming unit, and can reset the dimming unit to an initial position.
Further, the reset unit comprises a rigid body and an elastic piece, wherein the rigid body is fixed on the installation unit and moves along with the installation unit;
the two ends of the elastic piece are respectively connected with the rigid body and the dimming unit;
when the mounting unit does not vibrate, the dimming unit gradually resets to an initial position under the action of the elastic piece and the rigid body.
An embodiment of the present invention provides a vibration sensor, which uses an optical principle as a basis, and acquires a vibration signal of a vibration source by acquiring a light signal corresponding to a dimming unit related to the vibration source.
An embodiment of the present invention also provides a medical imaging apparatus including a vibration sensor as set forth in any one of the above. The medical imaging device has the vibration sensor described above. The medical imaging device can obtain the vibration signal of the internal vibration source through the vibration sensor to take corresponding countermeasures, such as taking active noise reduction measures on the vibration source or monitoring the stability of the component through the obtained vibration signal, so as to facilitate guiding the maintenance operation.
Drawings
FIG. 1 is a schematic diagram of a vibration sensor according to an embodiment of the present invention;
FIG. 2 is a schematic view of a part of the vibration sensor shown in FIG. 1, with a housing omitted;
FIG. 3 is a schematic view of the vibration sensor of FIG. 2 from another perspective after omitting some components;
FIG. 4 is a schematic view of the vibration sensor of FIG. 2 from another perspective after omitting some components;
FIG. 5 is a schematic cross-sectional view of the vibration sensor of FIG. 4;
fig. 6 is a schematic view of the structure of an optical unit in the vibration sensor shown in fig. 1.
Description of element reference numerals
100. A vibration sensor; 10. an installation unit; 11. a housing; 12. a body; 121. a mounting hole; 13. a slide rail; 14. a reset unit; 141. a rigid body; 142. an elastic member; 20. a dimming unit; 21. a light reflecting portion; 22. a light absorption portion; 30. an optical unit; 31. an incident signal fiber; 32. a reflected signal optical fiber; 33. a first end; 34. a second end; 35. a light collimator.
The foregoing general description of the invention will be described in further detail with reference to the drawings and detailed description.
Detailed Description
The present invention will be further described in detail with reference to the drawings and the detailed description, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the invention.
It is noted that when an element is referred to as being "mounted to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.
The current medical imaging equipment has the characteristics of high magnetic field, high radio frequency field and the like. The existing electric vibration sensor applied to the medical imaging equipment is easy to generate larger interference signals due to the coupling of electronic devices or electric lead wires, and is easy to cause the distortion of acquired signals of the medical imaging equipment and even cause the damage of the vibration sensor devices, so that the operation imaging quality and stability of the medical imaging equipment are affected.
Referring to fig. 1 and fig. 2 together, fig. 1 is a schematic structural diagram of a vibration sensor 100 according to an embodiment of the invention; fig. 2 is a schematic partial structure of the vibration sensor 100 shown in fig. 1, with the housing 11 omitted.
An embodiment of the present invention provides a vibration sensor 100 for detecting a vibration signal of a vibration source, so that a medical imaging apparatus with a vibration source can take corresponding countermeasures according to the vibration signal, for example, taking an active noise reduction measure for the vibration source or monitoring the stability of a component through the obtained vibration signal, thereby facilitating the guiding of maintenance operations.
The vibration sensor 100 includes a mounting unit 10, a dimming unit 20, and an optical unit 30. The mounting unit 10 is connected to a vibration source (not shown) and is capable of responding to vibrations of the vibration source; the light modulation unit 20 is movably arranged relative to the mounting unit 10 and correspondingly moves under the vibration action of the mounting unit 10, and the light signal reflected by the light modulation unit 20 is related to the movement amount of the mounting unit 10; the optical unit 30 faces and aligns the light modulation unit 20, is capable of transmitting an optical signal to the light modulation unit 20, and receiving the optical signal reflected by the light modulation unit 20 to the optical unit 30, and is capable of converting the transmitted optical signal into an electrical signal. The mounting unit 10 is used for carrying elements such as the dimming unit 20 and the like and correspondingly vibrates along with a vibration source; the dimming unit 20 is used for responding to vibration of the mounting unit 10 and reflecting corresponding light signals to the optical unit 30; the optical unit 30 is used for transmitting an optical signal to the dimming unit 20 and receiving the optical signal reflected by the dimming unit 20.
When the vibration source vibrates, the mounting unit 10 vibrates accordingly with the vibration source; the dimming unit 20 responds to the vibration of the mounting unit 10 and moves correspondingly with respect to the mounting unit 10; the optical unit 30 transfers the optical signal to the dimming unit 20; the dimming unit 20 adjusts the corresponding light signal and reflects the light signal to the optical unit 30; the optical unit 30 converts the light signal reflected by the dimming unit 20 into an electrical signal, and thereby obtains the movement position of the dimming unit 20, thereby further obtaining the vibration signal of the vibration source.
It should be explained that: the dimming unit 20 adjusts the corresponding light signal and reflects to the optical unit 30 means that: the dimming unit 20 moves to different positions in response to vibration of the mounting unit 10, and the light signal reflected by the dimming unit 20 corresponding to the optical unit 30 is changed according to the different movement positions of the dimming unit 20; the light modulation unit 20 can respond to the vibration of the mounting unit 10 to perform the movement of the corresponding track, so that the vibration signal of the vibration source can be obtained from the light signal correspondingly reflected by the light modulation unit 20.
In one embodiment, as shown in fig. 1, the mounting unit 10 includes a mounting member (not numbered) and a housing 11. The mounting member is fixed in the housing 11; the housing 11 is fixed to a vibration source to be detected. The mounting piece is used for movably arranging the dimming unit 20; the housing 11 is used to house the mounting, the dimming unit 20 and at least the optical unit 30. At least a part of the optical unit 30 is fixedly mounted on the housing 11 such that one end of the optical unit 30 faces toward the dimming unit 20 disposed in the housing 11. This facilitates the fixation of the vibration sensor 100 as a whole to the vibration source.
Preferably, the housing 11 is a generally square hollow box. It will be appreciated that in other embodiments, the housing 11 may be provided in other shapes, such as a sphere, depending on the actual installation space, as long as it can be used to secure with the vibration source and house the mount, the dimming unit 20, and part of the optical unit 30.
The mounting member is fixed in the housing 11 and vibrates accordingly with the vibration of the housing 11. The mounting member includes a body 12 and a slide rail 13. The body 12 is fixed to the housing 11; the slide rail 13 is fixedly connected to the body 12 and is used for sliding connection with the dimming unit 20. The body 12 of the mount is fixed to the housing 11 and is capable of vibrating with the corresponding vibration source through the housing 11; at this time, the dimming unit 20 slidably connected to the slide rail 13 moves along the slide rail 13 due to the own inertia of the object, and the moving track of the dimming unit 20 is related to the vibration of the mounting member.
It will be appreciated that in some cases, the dimming unit 20 may be connected to the mounting member in other manners, for example, the dimming unit 20 is directly responsive to the vibration of the body 12 in three dimensions, and the corresponding optical unit 30 is also capable of detecting the corresponding light reflection area of the dimming unit 20, for example, the optical unit 30 of the corresponding dimming unit 20 is configured as a cambered surface, and the corresponding dimming unit 20 is configured as a sphere, so long as confirmation of the movement position of the dimming unit 20 can be achieved.
Referring to fig. 3, fig. 3 is a schematic structural diagram of the vibration sensor 100 shown in fig. 2 from another perspective after omitting some elements.
As shown in fig. 2, the body 12 is a substantially square box, and is correspondingly fixed in the square housing 11. Three sliding rails 13 are respectively arranged on three surfaces of the body 12, and the extending directions of the three sliding rails 13 are mutually perpendicular. A dimming unit 20 is disposed on each sliding rail 13 along the extending direction of the corresponding sliding rail 13. When the body 12 responds to the vibration of the vibration source through the housing 11, the driving action of the body 12 on the light modulation units 20 is practically decomposed into three light modulation units 20 respectively sliding along the extending direction of the corresponding slide rail 13. The extending direction of the three sliding rails 13 is the sliding direction of the three dimming units 20.
It can be appreciated that in other embodiments, the sliding rail 13 may be directly opened on the surface of the body 12, so long as the dimming unit 20 can slide along the corresponding sliding rail 13; and the extending directions of the three sliding rails 13 may be set at other angles, for example, the angle between two sliding rails 13 may be 60 °, so long as the sliding of the dimming unit 20 corresponding to the vibration of the body 12 and correspondingly decomposed into three directions can be realized. The shape of the body 12 may be set according to practical requirements, and is not particularly limited herein.
In the present embodiment, if the slide rail 13 is directly provided to the housing 11, the main body 12 may be omitted accordingly, as long as three dimming units 20 can be respectively slid along the corresponding slide rails 13.
Preferably, in order to enable the dimming unit 20 to be stably slidably coupled to the slide rails 13, each slide rail 13 is provided with two rails (not numbered) in parallel in the extending direction. Thus, the sliding of the dimming unit 20 is less likely to be askew. It will be appreciated that each rail 13 corresponds to one or more than three tracks.
Referring to fig. 4 and fig. 5 together, fig. 4 is a schematic structural diagram of the vibration sensor 100 shown in fig. 2 from another view after omitting some elements; fig. 5 is a schematic cross-sectional view of the vibration sensor 100 shown in fig. 4.
To further enable the dimming unit 20 to return to the initial position when the vibration source is not vibrating, the vibration sensor 100 further includes a reset unit 14. The resetting unit 14 is installed inside the installation member, and serves to reset the dimming unit 20 to an initial position. The reset unit 14 includes a rigid body 141 and an elastic member 142. The rigid body 141 is fixed to the body 12 of the mount; both ends of the elastic member 142 are connected to the dimming cell 20 and the rigid body 141, respectively. When the housing 11 and the mounting member correspondingly stop vibrating, the rigid body 141 responds to the mounting member in time, and gradually resets the dimming unit 20 to the initial position through the elastic member 142.
In the present embodiment, as shown in fig. 3, the number of rigid bodies 141 is one; the elastic member 142 is provided corresponding to the dimming unit 20 and has three numbers. The rigid body 141 has a structure in which a ball is connected to an end of a rod-shaped object. The three elastic members 142 are respectively disposed at regions corresponding to the spheres of the rigid body 141 according to the positions of the dimming cells 20. The corresponding position of the body 12 with the sliding rail 13 (i.e. the middle position of the two rails) is provided with a mounting hole 121, and the mounting hole 121 extends along the direction of the sliding rail 13. The mounting hole 121 is used for the elastic member 142 to penetrate through the body 12, and enables the elastic member 142 to move in the mounting hole 121 along the extending direction of the mounting hole 121, so that the dimming unit 20 can be reset under the action of the elastic member 142. By the arrangement, the reset unit 14 is simple in structure and low in cost; while enabling all three corresponding dimming cells 20 to be reset in time.
It will be appreciated that in other embodiments, the structure of the rigid body 141 may be configured accordingly according to the actual requirements, as long as it can be used to respond to the vibration of the mounting member and connect the elastic member 142; the number of the elastic members 142 may be greater than that of the light adjusting units 20, and each light adjusting unit 20 may be provided with two or more elastic members 142 according to actual requirements.
Preferably, the elastic member 142 is a spring. The arrangement of the springs makes the movement of the dimming unit 20 in response to the mounting member less susceptible to the springs and lower in production cost. It will be appreciated that in other embodiments, the elastic member 142 may be other components that are elastic and easy to reset the dimming unit 20.
As shown in fig. 2 and 3, the dimming units 20 are slidably disposed with respect to the mounting member, so that the dimming units 20 can respond to vibration of the body 12, and the dimming units 20 are disposed in one-to-one correspondence with the optical units 30. So arranged, the optical unit 30 is able to acquire the movement position of each dimming cell 20.
The light adjusting unit 20 includes a light reflecting portion 21 and a light absorbing portion 22. The light reflecting portion 21 and the light absorbing portion 22 are sleeved on the slide rail 13 along the sliding direction of the light adjusting unit 20, that is, the areas of the light reflecting portion 21 and the light absorbing portion 22 corresponding to the optical unit 30 are correspondingly changed during the sliding process. The light reflecting portion 21 is for reflecting an optical signal incident in an area corresponding to the optical unit 30. The light absorbing portion 22 serves to suppress reflection of an optical signal within an area of the light absorbing portion 22 corresponding to the optical unit 30.
When the light reflecting portion 21 and the light absorbing portion 22 move along the sliding rail 13 correspondingly due to the vibration of the main body 12, the areas of the light reflecting portion 21 and the light absorbing portion 22 corresponding to the optical unit 30 change correspondingly, the light signals reflected by the light reflecting portion 21 and the light absorbing portion 22 corresponding to the optical unit 30 are transmitted to the optical unit 30, and the correspondingly reflected light signals are converted into electrical signals through the optical unit 30, so that the corresponding movement data of the light adjusting unit 20 are obtained, and the vibration signals corresponding to the vibration source are obtained.
Referring to fig. 6, fig. 6 is a schematic diagram of an optical unit 30 in the vibration sensor 100 shown in fig. 1.
The optical unit 30 includes an incident signal optical fiber 31, a reflected signal optical fiber 32, and a photoelectric conversion element (not shown). One end of the incident signal optical fiber 31 and one end of the reflected signal optical fiber 32 face the dimming unit 20; the other end of the incident signal fiber 31 is connected to a light source, and the other end of the reflected signal fiber 32 is connected to a photoelectric conversion element. The incident signal fiber 31 is used for connecting a light source and transmitting an incident light signal to the dimming unit 20; the reflected signal optical fiber 32 is used for transmitting the optical signal reflected by the dimming unit 20 to the photoelectric conversion element; the photoelectric conversion element is used to convert the optical signal transmitted by the reflected signal optical fiber 32 into an electrical signal.
In one embodiment, the optical unit 30 further includes a light source (not shown). The light source is connected to an end of the incident signal fiber 31 relatively far from the dimming unit 20. The light source is for emitting an optical signal. This arrangement results in vibration sensor 100 being a relatively complete sensing device. It will be appreciated that in other embodiments, the light source may be an external component, as long as it is capable of being implemented as an optical signal emitted by the incident signal fiber 31 of the optical unit 30.
Specifically, the number of the incident signal fibers 31 and the reflected signal fibers 32 is plural, and the plural incident signal fibers 31 and the reflected signal fibers 32 are bundled. The ends of the incident signal optical fiber 31 and the reflected signal optical fiber 32 relatively close to the dimming unit 20 are a first end 33, and the ends of the incident signal optical fiber 31 and the reflected signal optical fiber 32 relatively far from the dimming unit 20 are a second end 34. The plurality of incident signal optical fibers 31 and the reflected signal optical fibers 32 positioned at the first end 33 are mixed with each other and arranged at intervals; the first end 33 formed by bundling the plurality of incident signal fibers 31 and the reflected signal fibers 32 is fixed to the housing 11 and disposed toward the dimming unit 20. The plurality of incident signal optical fibers 31 and the plurality of reflected signal optical fibers 32 at the second end 34 are respectively clustered, the plurality of incident signal optical fibers 31 are clustered and then connected with the light source, and the plurality of reflected signal optical fibers 32 are technically arranged and then connected with the photoelectric conversion element.
It should be noted that:
the plurality of incident signal fibers 31 and reflected signal fibers 32 at the first end 33 are mixed and arranged in a spaced arrangement: the incident signal optical fiber 31 and the reflected signal optical fiber 32 relatively close to the dimming cell 20 are uniformly mixed such that the number of the incident signal optical fiber 31 and the reflected signal optical fiber 32 is equal in any one region of the end face of the first end 33.
The plurality of incident signal fibers 31 and the plurality of reflected signal fibers 32 at the second end 34 are respectively bundled: the ends of the plurality of incident signal optical fibers 31 and the plurality of reflected signal optical fibers 32, which are relatively far from the dimming unit 20, are not separately arranged, but the light beams of the plurality of incident signal optical fibers 31 and the plurality of reflected signal optical fibers 32 are completely separated, so that the incident signal optical fibers 31 and the plurality of reflected signal optical fibers are respectively connected with the light source and the photoelectric conversion element.
The light reflecting portion 21 is configured to reflect the light signal of the corresponding incident signal fiber 31 to the reflected signal fiber 32. The light absorbing portion 22 suppresses reflection of the optical signal of the corresponding incident signal fiber 31. The area of the light reflecting portion 21 corresponding to the incident signal optical fibers 31 is the number of the incident signal optical fibers 31 corresponding to the projection of the light reflecting portion 21 on the end face of the first end 33, and the light signal transmitted by the incident signal optical fibers 31 contained in the area can be reflected to the reflected signal optical fibers 32 by the light reflecting portion 21. The area of the light absorbing portion 22 corresponding to the incident signal fibers 31 is the number of the incident signal fibers 31 corresponding to the projection of the light absorbing portion 22 on the end face of the first end 33, and the light signal of the incident signal fibers 31 in the area is absorbed by the light absorbing portion 22 and is not reflected to the reflection signal fibers 32.
In this way, the incident light signal in any area of the first end 33 can be uniformly transmitted to the dimming unit 20, so that when the areas of the light reflecting portion 21 and the light absorbing portion 22 of the dimming unit 20 corresponding to the end face of the first end 33 are correspondingly changed, the incident light signal is uniformly distributed, and the light signals incident by the light reflecting portion 21 and the light absorbing portion 22 are correspondingly changed along with the change of the areas. The light signals reflected by the light reflecting portion 21 and the light absorbing portion 22 are related to the incident light signals, and the reflected light signals can be transmitted to the photoelectric conversion elements through the reflective signal optical fibers 32 uniformly distributed at the first ends 33. Whereby the light signal of the first end 33 can be accurately fed back to the movement position of the dimmer unit 20.
The area of the light reflecting portion 21 corresponding to the incident signal optical fiber 31 and the area of the light absorbing portion 22 corresponding to the incident signal optical fiber 31 are effective reflection areas of the dimming unit 20 projected on the end surface of the first end 33. The photoelectric conversion element acquires a movement signal of the dimming unit 20 according to the light signal transmitted in real time in the effective reflection area. Since the movement of the dimming unit 20 is associated with the vibration source through the mount and the housing 11. Accordingly, the vibration signal of the vibration source can be acquired by the vibration sensor 100.
The manner in which the dimming cell 20 is disposed corresponding to the effective reflection region of the optical cell 30 is exemplified in fig. 3, but is not limited to the embodiment of fig. 3. The end face of the first end 33 is substantially circular; the side of the light modulation unit 20 facing the first end 33 is substantially rectangular, and the dimension of the light modulation unit 20 in the length direction is larger than the diameter of the end surface of the first end 33, and the dimension of the light modulation unit 20 in the width direction can be set correspondingly according to the requirement, so long as the area of the light reflection portion 21 and the light absorption portion 22 corresponding to the end surface of the first end 33 can be changed correspondingly along with the movement of the light modulation unit 20.
When the dimming unit 20 is located at the initial position, the areas of the end surfaces of the light reflecting portion 21 and the light absorbing portion 22 corresponding to the first end 33 are equal, that is, the number of the light reflecting portions 21 corresponding to the incident signal optical fibers 31 and the number of the light absorbing portions 22 corresponding to the incident signal optical fibers 31 are equal. When the light modulation unit 20 is deviated from the initial position in response to vibration of the mount, the end surface areas of the light reflection part 21 and the light absorption part 22 corresponding to the first end 33 are changed accordingly. For example, when the light reflecting portion 21 and the light absorbing portion 22 move in the arrow F direction of fig. 3, the end surface area of the light reflecting portion 21 corresponding to the first end 33 increases and then decreases, and the end surface area of the light absorbing portion 22 corresponding to the first end 33 continues to decrease, so that the light signals reflected by the light reflecting portion 21 and the light absorbing portion 22 change accordingly with the change of the movement position, and the movement signal of the dimming unit 20 is obtained by the reflected light signals.
It can be understood that, in other manners, the shape of the end surface of the first end 33, the shape of the light reflecting portion 21 and the light absorbing portion 22 in the light adjusting unit 20 can be set correspondingly according to actual requirements, as long as the area of the corresponding effective reflection area can be changed correspondingly during the movement of the light adjusting unit 20; even, the light absorbing portion 22 may not be provided, for example, the end face of the circular first end 33 and the light reflecting portion 21 inscribed in the circular regular triangle, so long as the effective reflection area corresponding to the light reflecting portion 21 can be changed during the movement.
In one embodiment, the optical unit 30 further comprises a light collimator 35 arranged at the first end 33. The light collimator 35 is connected to the incident signal optical fiber 31 and the reflected signal optical fiber 32 relatively near one end of the dimming cell 20. The first end 33 is fixed to the housing 11 by means of a light collimator 35. The light collimator 35 is used to collimate an incident light signal so that the light signal can be perpendicularly incident to the dimming unit 20. By the arrangement, the optical signals transmitted by the incident signal optical fibers 31 aligned with the end face of the first end 33 of the dimming unit 20 can be incident to the dimming unit 20, so that the optical signals corresponding to the end face of the first end are prevented from being scattered outside the dimming unit 20, and the accuracy of the vibration sensor 100 is further improved.
An embodiment of the present invention provides a vibration sensor, which uses an optical principle as a basis, and acquires a vibration signal of a vibration source by acquiring a light signal corresponding to a dimming unit related to the vibration source.
An embodiment of the present invention also provides a medical imaging apparatus (not shown) having the vibration sensor described above. The medical imaging device can obtain the vibration signal of the internal vibration source through the vibration sensor to take corresponding countermeasures, such as taking active noise reduction measures on the vibration source or monitoring the stability of the component through the obtained vibration signal, so as to facilitate guiding the maintenance operation.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (14)
1. A vibration sensor, the vibration sensor comprising:
an installation unit;
the light adjusting unit is movably arranged relative to the mounting unit, the light adjusting unit which is connected to the sliding rail in the mounting unit in a sliding way moves along the sliding rail due to own inertia, and the light adjusting unit can move relative to the mounting unit along with vibration of the mounting unit;
the optical unit is arranged corresponding to the dimming unit, can transmit optical signals to the dimming unit and receives the optical signals reflected by the dimming unit;
wherein the light signal reflected by the dimming unit is associated with a movement amount of the mounting unit, and the dimming unit adjusts the reflection of the corresponding light signal to the optical unit in response to vibration of the mounting unit.
2. The vibration sensor according to claim 1, wherein the optical unit includes an incident signal fiber for transmitting an incident light signal to the dimming unit, a reflected signal fiber for transmitting an optical signal reflected by the dimming unit to the photoelectric conversion element, and a photoelectric conversion element;
the photoelectric conversion element is connected to one end of the reflection signal optical fiber, which is far away from the dimming unit, and converts the optical signal transmitted by the reflection signal optical fiber into an electric signal.
3. The vibration sensor of claim 2, wherein the incident signal optical fiber and the reflected signal optical fiber are plural, and the incident signal optical fiber and the reflected signal optical fiber are bundled.
4. A vibration sensor according to claim 3, wherein the optical unit includes a first end disposed toward the light adjusting unit, and a plurality of the incident signal fibers and the reflected signal fibers at the first end are mixed with each other and disposed in a spaced arrangement.
5. A vibration sensor according to claim 3, wherein the ends of the incident light signals away from the light modulation unit and the ends of the reflected signal fibers away from the light modulation unit are respectively bundled.
6. The vibration sensor according to claim 1, wherein the optical unit includes a first end disposed toward the light adjusting unit, the light adjusting unit is slidably disposed on the mounting unit, and an effective reflection area of the light adjusting unit projected on an end face of the first end changes accordingly when the light adjusting unit slides with respect to the mounting unit.
7. The vibration sensor according to claim 6, wherein the dimming unit includes a light reflecting portion for reflecting the light signal and a light absorbing portion for suppressing reflection of the light signal;
the light reflecting part and the light absorbing part are arranged on the mounting unit in a sliding manner, and when the light reflecting part and the light absorbing part slide relative to the mounting unit, the area of the light reflecting part corresponding to the optical unit and the area of the light absorbing part corresponding to the optical unit are correspondingly changed;
the area of the light reflecting part corresponding to the optical unit and the area of the light absorbing part corresponding to the optical unit are effective reflection areas projected on the end face of the first end by the dimming unit.
8. The vibration sensor according to claim 7, wherein the light reflecting portion and the light absorbing portion are arranged in a sliding direction of the light adjusting unit.
9. The vibration sensor of claim 4, further comprising a light collimator disposed at the first end, the light collimator connecting the incident signal fiber and the reflected signal fiber relatively near an end of the dimming unit, and the light collimator being disposed opposite the dimming unit.
10. The vibration sensor according to claim 1, wherein the number of the light adjusting units is plural, the optical units are arranged in one-to-one correspondence with the light adjusting units, and each of the light adjusting units is different in moving direction with respect to the mounting unit.
11. The vibration sensor according to claim 10, wherein the mounting unit is provided with a slide rail corresponding to the dimming units, each of the dimming units being slidably provided to the corresponding slide rail.
12. The vibration sensor according to claim 1, further comprising a reset unit connected to the mounting unit and the dimming unit, respectively, and capable of resetting the dimming unit to an initial position.
13. The vibration sensor of claim 12, wherein the reset unit comprises a rigid body and an elastic member, the rigid body being fixed to the mounting unit and moving with the mounting unit;
the two ends of the elastic piece are respectively connected with the rigid body and the dimming unit;
when the mounting unit does not vibrate, the dimming unit gradually resets to an initial position under the action of the elastic piece and the rigid body.
14. A medical imaging device, characterized in that it comprises a vibration sensor according to any one of claims 1 to 13.
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