CN215984392U - Displacement detection device without lens - Google Patents
Displacement detection device without lens Download PDFInfo
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- CN215984392U CN215984392U CN202121970355.5U CN202121970355U CN215984392U CN 215984392 U CN215984392 U CN 215984392U CN 202121970355 U CN202121970355 U CN 202121970355U CN 215984392 U CN215984392 U CN 215984392U
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Abstract
The utility model provides a lens-free displacement detection device, which comprises a laser transmitter, an optical modulation unit, a support component, a collection optical fiber and a measurement device, wherein the laser transmitter emits an incident laser source and leads the incident laser source into the optical modulation unit through an optical fiber end face arranged at an outlet of the laser transmitter; after the incident laser source deflects on the path in the optical modulation unit, the incident laser source enters the end face of the collection optical fiber formed by the collection optical fiber and is conducted to the measuring device through the collection optical fiber. According to the utility model, the technical problem that a nano optical structure is not required to be manufactured based on a complex micro-nano structure is solved by using a standard optical filament as an optical modulation unit and a proper optical structure, so that the sensitive detection of the offset position can be realized under the scale that the volume is far less than 1 mm.
Description
Technical Field
The utility model relates to the technical field of laser positioning, in particular to a lens-free displacement detection device.
Background
The technique of the position of accurate detection object is in the extensive application in many fields, like laser positioning, inertial navigation etc. general position measurement need use lens structure to modulate the light path, and lens structure needs to occupy great volume, can't carry out effectual integration and realize the miniaturization, and lens structure occupies great volume moreover and means the mechanical stability of system receives the influence of environment more easily, like temperature drift etc. leads to detecting the precision great noise under the low frequency.
Typical examples include astronomical laser interferometers and the like; the detection method of the integrated optical cavity manufactured based on the micro-nano processing technology, such as a disc cavity and the like, although the detection method and the detection method do not depend on a lens structure, the detection method has the defects of limitation due to the difficult manufacturing of the optical cavity, higher cost, easy damage and low manufacturing power of the method, cannot be used for large-scale mass production and can only stay at the laboratory research and application level.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a lens-free displacement detection device to solve the problems in the background art, and the utility model realizes the technical problem of no need of manufacturing a nano optical structure based on a complex micro-nano structure by using a standard optical filament as an optical modulation unit and a proper optical structure, achieves the mode of realizing the sensitive detection of the position under the scale of the volume far less than 1mm, and solves the problems in the prior art.
In order to achieve the purpose, the utility model is realized by the following technical scheme: a lens-free displacement detection device comprises a laser emitter, an optical modulation unit, a support component, a collection optical fiber and a measuring device,
the laser transmitter emits an incident laser source and leads the incident laser source into the optical modulation unit through an optical fiber end face arranged at an outlet of the laser transmitter;
after the path of the incident laser source in the optical modulation unit is deflected, the incident laser source enters a collection optical fiber end surface formed by a collection optical fiber and is conducted to a measuring device through the collection optical fiber, wherein,
the laser transmitter, the optical modulation unit and the measuring device are all positioned on the same horizontal line, and the optical modulation unit is fixedly arranged on a light path of a laser source transmitted by the laser transmitter through a supporting component;
the path of the incident laser source before entering the optical modulation unit is symmetrical to the path of the incident laser source before entering the end face of the collection optical fiber with the geometric center of the optical modulation unit.
As an improvement to the lens-less displacement detecting device of the present invention, the optical modulation unit is composed of an optical fiber or a glass filament with a deflected optical path.
As an improvement to the lens-less displacement detecting device of the present invention, the optical fiber with deflected optical path is a standard optical fiber.
As an improvement to the lens-less displacement detection device of the present invention, the measurement device is composed of a light intensity detector, a solid-state quantum system, a capacitive displacement sensor, or a superconducting interferometer, and is used for measuring a change in position of a laser source entering the measurement device.
Compared with the prior art, the utility model has the beneficial effects that:
1. according to the utility model, the technical problem that a nano optical structure is not required to be manufactured based on a complex micro-nano structure is solved by using a standard optical filament as an optical modulation unit and a proper optical structure, so that the sensitive detection of the offset position can be realized under the scale that the volume is far less than 1 mm;
2. compared with the traditional optical measurement method or system, namely a free light-lens-based mode, the volume is greatly reduced, the thermal drift becomes smaller along with the reduction of the volume, and the thermal drift is a main noise source for displacement low-frequency measurement, so that the method has great advantages in the application fields of low-frequency signal measurement, such as gravity measurement, strain measurement and the like;
3. the utility model aims to solve the problems that the currently developed integrated optical technology utilizes a micro-nano processing means to manufacture an optical microcavity, displacement measurement can be integrated on a chip with the diameter of less than 1mm by the technology, but the micro-nano processing cost is high, the method has high environmental requirements, is easily influenced by factors such as impact, dust and the like, and once the micro-nano processing means is damaged, the micro-nano processing means can be manufactured again and cannot be repaired, so that the used element is a standard optical fiber, the micro-nano processing means can be manufactured by common technical means such as an adhesive, an optical fiber cutter and the like during specific implementation, and can be bonded again after being damaged, thereby achieving the aim of avoiding the precise integrated optical technology, realizing the position measurement by adopting a simple optical fiber structure and having the advantages of low cost and high reliability.
Drawings
The disclosure of the present invention is illustrated with reference to the accompanying drawings. It is to be understood that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the utility model, for which like reference numerals are used to indicate like parts. Wherein:
fig. 1 is a schematic diagram illustrating the overall structure, installation and principle of a lens-free displacement detecting device according to an embodiment of the present invention.
Description of reference numerals:
1-laser emitter, 2-optical fiber end face at the outlet of the laser emitter, 3-optical modulation unit, 4-collecting optical fiber, 5-light intensity detector, 6-support component and 7-fixing component.
Detailed Description
It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.
As shown in fig. 1, as an embodiment of the present invention, the present invention provides a technical solution: the utility model provides a displacement detection device of no lens, it needs to explain adopt optical filament as optical modulation unit 3, through utilizing standard optical filament as optical modulation unit 3, and appropriate optical structure, realized need not based on the technical problem of complicated micro-nano structure preparation nanometer optical structure, thereby reach and to realize the sensitive detection of skew position under the yardstick that the volume is far less than 1mm, not only produce very strong position sensitivity, and have the directionality, compare prior art not only can the size of measuring, can also give the direction information of position, the vector detection ability that possesses the position, based on this, its principle of carrying out the sensitive detection of position does:
when the position of the medium moves, the corresponding displacement is deltax, the corresponding optical path also deflects, and for a light intensity detector with determined position, the received light intensity also changes deltaI, so for a tiny movement, the two can be calculated by the expression:
Therefore, the above principle concept is achieved, and in an embodiment of the present invention, a lens-free displacement detecting apparatus includes: laser emitter 1, optical modulation unit 3, support assembly 6, collection fiber 4, and measurement device, it being understood that,
an incident laser source is emitted by a laser emitter 1 and is guided into an optical modulation unit 3 through an optical fiber end face 2 arranged at an outlet of the laser emitter, the incident laser source is deflected in a path in the optical modulation unit, enters a collection optical fiber end face formed by a collection optical fiber 4 and is conducted into a measuring device through the collection optical fiber 4, at this time, the laser source generated by the laser emitter 1 does not need to pass through a lens, and directly passes through a transverse optical fiber or a glass (optical) filament (sensitive element) shown in figure 1, the light is deflected and converged by the glass filament, the deflection optical fiber is changed along an x-axis position, and is not sensitive along an axial direction y and a light relay direction z, so that effective direction dependence is formed, and the converged light is collected by another optical fiber which is symmetrical to the path before the incident laser source enters the optical modulation unit 3, directly into the light intensity detector 5 and detected.
In an embodiment of the present invention, the laser emitter 1, the optical modulation unit 3, and the measurement device are all located on the same horizontal line, a path before the incident laser source enters the optical modulation unit 3 and a path before the incident laser source enters the end face of the collection optical fiber 4 are symmetrical about a geometric center of the optical modulation unit 3, and the optical modulation unit 3 is fixedly mounted on a light path of the laser emitter emitting laser source through a support assembly 6, wherein a fixing assembly 7 is disposed at a connection position of the optical modulation unit 3 and the support assembly 6, where the fixing assembly 7 may be a snap, so as to adjust the optical modulation unit 3 relative to the support assembly 6 until the optical modulation unit 3, the laser emitter 1, and the measurement device are located on the same straight line.
As an embodiment of the present invention, in order to solve the currently developed integrated optical technology, a micro-nano processing means is used to fabricate an optical microcavity, which can integrate displacement measurement on a chip below 1mm, but the micro-nano processing cost is high, and the method has high requirements on the environment, is easily affected by factors such as impact, dust, etc., and once damaged, cannot be repaired by re-fabrication, so that the sensing element used in the present invention is a standard optical fiber, can be fabricated by common technical means such as an adhesive, an optical fiber cutter, etc. during specific implementation, and can be re-bonded after being damaged, so as to achieve the purpose of avoiding precise integrated optical technology, achieve the position measurement by using a simple optical fiber structure and have the advantages of low cost and high reliability, therefore, the optical modulation unit 3 is composed of an optical fiber or a glass filament with a deflection optical path, the optical fiber with the deflection optical path is a standard optical fiber.
As an embodiment of the present invention, the measuring device is composed of a light intensity detector 5, or a solid-state quantum system, or a capacitive displacement sensor, or a superconducting interferometer, and the measuring device is preferably the light intensity detector 5, and is used for measuring the position change of the laser source entering the measuring device, so as to achieve the highest detection efficiency of the position measurement of the laser.
It can be understood that compared with the traditional optical measurement method or measurement device, that is, based on a free light-lens manner, the volume of the present invention can be greatly reduced, in specific implementation, the volume occupied by the displacement detection device without the lens can be much less than 1mm, which is one tenth of that of the free light-lens detection, and meanwhile, the smaller volume means the lower thermal drift, which is the main noise source for the displacement low-frequency measurement, so that the present invention is greatly suitable for the application fields of low-frequency signal measurement, such as gravity measurement, strain measurement, etc.
The technical scope of the present invention is not limited to the above description, and those skilled in the art can make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and such changes and modifications should fall within the protective scope of the present invention.
Claims (4)
1. A lens-free displacement detecting device, characterized by: comprises a laser transmitter, an optical modulation unit, a supporting component, a collection optical fiber and a measuring device,
the laser transmitter emits an incident laser source and leads the incident laser source into the optical modulation unit through an optical fiber end face arranged at an outlet of the laser transmitter;
after the path of the incident laser source in the optical modulation unit is deflected, the incident laser source enters a collection optical fiber end surface formed by a collection optical fiber and is conducted to a measuring device through the collection optical fiber, wherein,
the laser transmitter, the optical modulation unit and the measuring device are all positioned on the same horizontal line, and the optical modulation unit is fixedly arranged on a light path of a laser source transmitted by the laser transmitter through a supporting component;
the path of the incident laser source before entering the optical modulation unit is symmetrical to the path of the incident laser source before entering the end face of the collection optical fiber with the geometric center of the optical modulation unit.
2. A lens-free displacement detecting device according to claim 1, wherein: the optical modulation unit is composed of an optical fiber or a glass filament with a deflected light path.
3. A lens-free displacement detecting device according to claim 2, wherein: the optical fiber with the deflected light path is a standard optical fiber.
4. A lens-free displacement detecting device according to claim 1, wherein: the measuring device consists of a light intensity detector or a solid-state quantum system or a capacitance displacement sensor or a superconducting interferometer and is used for measuring the position change of a laser source entering the measuring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121970355.5U CN215984392U (en) | 2021-08-20 | 2021-08-20 | Displacement detection device without lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121970355.5U CN215984392U (en) | 2021-08-20 | 2021-08-20 | Displacement detection device without lens |
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| Publication Number | Publication Date |
|---|---|
| CN215984392U true CN215984392U (en) | 2022-03-08 |
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| CN202121970355.5U Active CN215984392U (en) | 2021-08-20 | 2021-08-20 | Displacement detection device without lens |
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| CN (1) | CN215984392U (en) |
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2021
- 2021-08-20 CN CN202121970355.5U patent/CN215984392U/en active Active
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Address after: Room 5001, Building C, No. 288 Qinhuai Avenue, Yongyang Street, Lishui District, Nanjing City, Jiangsu Province, 210000 Patentee after: Nanjing Naga Precision Instrument Technology Co.,Ltd. Address before: 215100 room 1211, 12 / F, Suzhou Port building, No. 60, qinglonggang Road, high speed railway new town, Xiangcheng District, Suzhou City, Jiangsu Province Patentee before: Suzhou Naga Precision Instrument Technology Co.,Ltd. |
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