NL2023992B1 - Tapered fiber optic acceleration sensor system - Google Patents

Tapered fiber optic acceleration sensor system Download PDF

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Publication number
NL2023992B1
NL2023992B1 NL2023992A NL2023992A NL2023992B1 NL 2023992 B1 NL2023992 B1 NL 2023992B1 NL 2023992 A NL2023992 A NL 2023992A NL 2023992 A NL2023992 A NL 2023992A NL 2023992 B1 NL2023992 B1 NL 2023992B1
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Prior art keywords
fiber
acceleration sensor
coupler
demodulator
cavity
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NL2023992A
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Dutch (nl)
Inventor
Liu Qi
Chen Shaojie
Chai Jing
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Univ Shandong Science & Tech
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
    • G01P15/093—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by photoelectric pick-up
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/03—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses by using non-electrical means

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Transform (AREA)
  • Pressure Sensors (AREA)
  • Gyroscopes (AREA)

Abstract

The present invention provides a tapered fiber acceleration sensor system, comprising: a protecting shell, an elastic base layer, a light source, a circulator, a coupler, a fiber phase modulator/demodulator, an isolator and a photodetector. The elastic base layer is arranged in the protecting shell to divide a cavity in the protecting shell into an upper sub—cavity and a lower sub—cavity; an upper surface and a lower surface of the elastic base layer are respectively provided with sensing fiber assemblies for detecting deformation; the sensing fiber assemblies are respectively connected with the fiber phase modulator/demodulator; the light source is coupled with the circulator; the circulator is respectively coupled with the coupler and the photodetector; the coupler is respectively connected with the isolator and the fiber phase modulator/demodulator; and the isolator is coupled with the photodetector. The ends of the sensing fiber assemblies are provided with reflecting layers; monochromatic light generated by the light source is split into two beams of equal—intensity light through the coupler; and the two beams of light are reflected back through the reflecting layers, and then pass through the coupler again.

Description

1 AO 19.10.1074 NL Tapered fiber acceleration sensor system The present invention is proposed based on a Chinese patent application with application number of 201910294026.4 and application date of April 12, 2019, and claims the priority of the Chinese patent application, the disclosures of which are hereby incorporated by reference.
Technical Field The present invention relates to the field of sensor measurement, and particularly relates to a tapered fiber acceleration sensor system.
Background At present, a main measuring component of an inclinometer used in China and abroad uses a fluxgate sensor or a mechanical gyroscope as an angular velocity sensor combined with an accelerometer to measure an inclined angle and an azimuth.
However, such inclinometer has the disadvantages of low measurement accuracy, short instrument life, untimely data processing and impossibility of monitoring in severe weather such as heavy rain, and seriously affects the efficiency of internal deformation monitoring in coal mines, causing that monitoring personnel cannot know the internal deformation in the coal mines in time.
Moreover, the accelerometer in the prior art has low detection sensitivity and accuracy.
Therefore, the prior art has defects and needs to be improved urgently.
Summary The purpose of the present invention is to provide a tapered fiber acceleration sensor system having the beneficial effects of sensitivity and accuracy of a tapered fiber acceleration sensor system.
Embodiments of the present invention provide a tapered fiber acceleration sensor system, comprising: a protecting shell, an elastic base layer, a light source, a circulator, a coupler, a fiber phase modulator/demodulator, an isolator and a photodetector.
The elastic base layer is arranged in the protecting shell to divide a cavity in the protecting shell into an upper sub-cavity and a lower sub-cavity; an upper surface and a lower surface of the elastic base layer are respectively provided with sensing fiber
2 AO 19.10.1074 NL assemblies for detecting deformation; the sensing fiber assemblies are respectively connected with the fiber phase modulator/demodulator; the light source is coupled with the circulator; the circulator is respectively coupled with the coupler and the photodetector; the coupler is respectively connected with the isolator and the fiber phase modulator/demodulator; and the 1s0lator is coupled with the photodetector. The ends of the sensing fiber assemblies are provided with reflecting layers; monochromatic light generated by the light source is split into two beams of equal- intensity light through the coupler; and the two beams of light are reflected back through the reflecting layers, pass through the coupler again, and pass through the isolator to reach the photodetector.
In the tapered fiber acceleration sensor system of the present invention, the reflecting layers are coating layers.
In the tapered fiber acceleration sensor system of the present invention, the fiber phase modulator/demodulator is a PZT modulator/demodulator.
In the tapered fiber acceleration sensor system of the present invention, the sensing fiber assemblies comprise a compliant cylinder, a sensitive mass block and a sensing fiber; the compliant cylinder is connected with the sensitive mass block; the sensitive mass block is coupled with the sensing fiber.
Both ends of the fiber are coated with the reflecting layers.
In the tapered fiber acceleration sensor system of the present invention, the sensitive mass block is in a shape of a triangular pyramid; and a pyramid top of the sensitive mass block comes into contact with the fiber.
In the tapered fiber acceleration sensor system of the present invention, the protecting shell is provided with an opening for connecting the cavity with the outside.
In the tapered fiber acceleration sensor system of the present invention, an outer outline of the protecting shell is in a shape of a rectangular block.
In the tapered fiber acceleration sensor system of the present invention, an inner wall of the cavity is provided with a circle of clamping grooves; and the edge of the elastic base layer is clamped in the clamping grooves.
In the tapered fiber acceleration sensor system of the present invention, the elastic base layer is in a shape of a rectangular plate.
3 AO 19.10.1074 NL In the tapered fiber acceleration sensor system of the present invention, adhesives are arranged in the clamping grooves. The present invention has the beneficial effects of improving detection accuracy and sensitivity. In the present invention, the elastic base layer is arranged in the protecting shell to divide the cavity in the protecting shell into the upper sub-cavity and the lower sub-cavity; the upper surface and the lower surface of the elastic base layer are respectively provided with sensing fiber assemblies for detecting deformation; the sensing fiber assemblies are respectively connected with the fiber phase modulator/demodulator; the light source is coupled with the circulator; the circulator is respectively coupled with the coupler and the photodetector; the coupler is respectively connected with the isolator and the fiber phase modulator/demodulator; the isolator is coupled with the photodetector; the ends of the sensing fiber assemblies are provided with reflecting layers; monochromatic light generated by the light source is split Into two beams of equal-intensity light through the coupler; and the two beams of light are reflected back through the reflecting layers, pass through the coupler again, and pass through the isolator to reach the photodetector. The present invention has the beneficial effects of improving detection accuracy and sensitivity. Description of Drawings Fig. 1 is a structural schematic diagram of a tapered fiber acceleration sensor system in some embodiments of the present invention. Fig. 2 is a schematic diagram of a tapered fiber acceleration sensor system in some embodiments of the present invention.
Detailed Description Embodiments of the present invention will be described below in detail. Examples of the embodiments are shown in drawings, wherein same or similar reference signs refer to same or similar elements or elements having same or similar functions from beginning to end. Embodiments described below by reference to the drawings are exemplary embodiments, and are only used for explaining the present invention, and shall not be understood as a limitation to the present invention.
4 AO 19.10.1074 NL It should be understood in the description of the present invention that terms such as "central", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" etc. indicate direction or position relationships shown based on the drawings, and are only intended to facilitate the description of the present invention and the simplification of the description rather than to indicate or imply that the indicated device or element must have a specific direction or constructed and operated in a specific direction, and therefore, shall not be understood as a limitation to the present invention. In addition, the terms such as "first" and "second" are only used for the purpose of description, rather than being understood to indicate or imply relative importance or hint the number of indicated technical features. Thus, the feature limited by "first" and "second" can explicitly or impliedly comprise one or more features. In the explanation of the present invention, the meaning of "a plurality of” is two or more unless otherwise clearly specified.
It should be noted in the explanation of the present invention that, unless otherwise specifically regulated and defined, terms such as "installation," "connected," and “connecting” shall be understood in broad sense, and for example, may refer to fixed connection or detachable connection or integral connection, may refer to mechanical connection or electrical connection or mutual communication, and may refer to direct connection or indirect connection through an intermediate medium or inner communication of two elements or interaction relationship of two elements. For those ordinary skilled in the art, the specific meanings of the above terms in the present invention may be understood according to concrete conditions.
In the present invention, unless otherwise clearly specified and defined, a first feature is "above" or "below" a second feature comprises that the first feature and the second feature come into direct contact or the first feature and the second feature come into contact through additional features thereof instead of direct contact. Moreover, the first feature is "on", "above" and "over" the second feature comprises that the first feature is directly above or slightly above the second feature, or just indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature 1s “under”, "below" and "beneath" the second feature comprises that the first feature is directly below or slightly below the second feature, or just indicates that the horizontal height of the first feature is lower than that of the second feature.
AO 19.10.1074 NL The following disclosure provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and arrangement of specific examples are described below. Of course, they are merely examples and are not intended to limit the 5 present invention. In addition, the present invention can repeat reference numbers and/or reference letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not indicate the relationship among the discussed embodiments and/or arrangement. Moreover, the present invention provides examples of various specific processes and materials, but those ordinary skilled in the art can recognize the application of other processes and/or the use of other materials.
With reference to Fig. 1 and Fig. 2, Fig. 1 is a structural diagram of a tapered fiber acceleration sensor system in some embodiments of the present invention. The tapered fiber acceleration sensor system comprises: a protecting shell 10, an elastic base layer 50, a light source 80, a circulator 70, a coupler 30, a fiber phase modulator/demodulator 20, an isolator 90 and a photodetector 100.
The elastic base layer 50 is arranged in the protecting shell 10 to divide a cavity in the protecting shell 10 into an upper sub-cavity and a lower sub-cavity; an upper surface and a lower surface of the elastic base layer 50 are respectively provided with sensing fiber assemblies 40 for detecting deformation; the sensing fiber assemblies 40 are respectively connected with the fiber phase modulator/demodulator 20; the light source 80 is coupled with the circulator 70; the circulator 70 1s respectively coupled with the coupler 30 and the photodetector 100; the coupler 30 is respectively connected with the isolator 90 and the fiber phase modulator/demodulator 20; and the isolator 90 is coupled with the photodetector 100.
The ends of the sensing fiber assemblies 40 are provided with reflecting layers; monochromatic light generated by the light source 80 is split into two beams of equal- intensity light through the coupler 30; and the two beams of light are reflected back through the reflecting layers, pass through the coupler 30 again, and pass through the isolator 90 to reach the photodetector 100.
When the system is under the inertia effect, the acceleration acts on the elastic base layer 50; and the phases of the sensing fiber assemblies 40 are changed, and two phases have constant amplitude and opposite directions. However, for other signals, such as temperature effects and environmental noise, two phases have constant amplitude and
6 AO 19.10.1074 NL the same direction, thereby generating a differential signal. An acceleration value is obtained by demodulating the differential signal.
The tapered fiber acceleration sensor system comprises a bracket mechanism 60. The bracket mechanism penetrates through a perforation on the elastic base layer 50. The light source 80, the circulator 70, the coupler 30, the fiber phase modulator/demodulator 20, the isolator 90 and the photodetector 100 are arranged on the bracket mechanism 60. In the tapered fiber acceleration sensor system of the present invention, the reflecting layers are coating layers. The fiber phase modulator/demodulator 20 comprises a PZT (piezoelectric ceramic transducer) modulator/demodulator, or comprises a PZT modulator 22 and a fiber demodulator 21.
The sensing fiber assemblies 40 comprise a compliant cylinder, a sensitive mass block and a sensing fiber; the compliant cylinder is connected with the sensitive mass block; the sensitive mass block is coupled with the sensing fiber; both ends of the fiber are coated with the reflecting layers.
The sensitive mass block is in a shape of a triangular pyramid; and a pyramid top of the sensitive mass block comes into contact with the fiber.
In some embodiments, the protecting shell 10 is provided with an opening for connecting the cavity with the outside.
In some embodiments, an outer outline of the protecting shell 10 is in a shape of a rectangular block. An inner wall of the cavity is provided with a circle of clamping grooves; and the edge of the elastic base layer is clamped in the clamping grooves. The elastic base layer is in a shape of a rectangular plate. Adhesives are arranged in the clamping grooves.
In the present invention, the elastic base layer is arranged in the protecting shell to divide the cavity in the protecting shell into the upper sub-cavity and the lower sub- cavity; the upper surface and the lower surface of the elastic base layer are respectively provided with sensing fiber assemblies for detecting deformation; the sensing fiber assemblies are respectively connected with the fiber phase modulator/demodulator; the light source is coupled with the circulator; the circulator is respectively coupled with the coupler and the photodetector; the coupler is respectively connected with the isolator and the fiber phase modulator/demodulator; the isolator is coupled with the photodetector; the ends of the sensing fiber assemblies are provided with reflecting
7 AO 19.10.1074 NL layers; monochromatic light generated by the light source is split into two beams of equal-intensity light through the coupler; and the two beams of light are reflected back through the reflecting layers, pass through the coupler again, and pass through the isolator to reach the photodetector. The present invention has the beneficial effects of improving detection accuracy and sensitivity. In the illustration of this description, the illustration of reference terms “one embodiment”, "some embodiments”, "exemplary embodiment”, "example", "specific example" or “some examples", etc. means that specific features, structures, materials or characteristics illustrated in combination with the embodiment or example are included in at least one embodiment or example of the present invention. In this description, exemplary statements for the above terms shall not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined appropriately in any one or more embodiments or examples.
To sum up, although the present invention is disclosed above through preferred embodiments, the above preferred embodiments are not used to limit the present invention. Those ordinary skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope defined by claims.

Claims (10)

8 AO 19.10.1074 NL Conclusies I. Een taps toelopend vezelsysteem van versnellingssensor, met het kenmerk dat het een beschermend omhulsel, een elastische basislaag, een lichtbron, een circulator, een koppelaar, een vezelfase modulator / demodulator, een isolator en een fotodetector omvat; waarbij de elastische basislaag is aangebracht in de beschermende schaal om een holte in de beschermende schaal te verdelen in een bovenste subholte en een onderste subholte; een bovenoppervlak respectievelijk een onderoppervlak van de elastische basislaag is voorzien van samenstellen van voelvezels voor het detecteren van vervorming; de samenstellen van voelvezels zijn verbonden met de vezelfase modulator respectievelijk demodulator; de lichtbron is gekoppeld met de circulator; de circulator is gekoppeld met de koppelaar respectievelijk de fotodetector; de koppelaar is verbonden met de isolator en de vezelfase modulator respectievelijk demodulator; de isolator is gekoppeld met de fotodetector; de uiteinden van de sensorvezelsamenstellen zijn voorzien van reflecterende lagen; monochromatisch licht gegenereerd door de lichtbron wordt gesplitst in twee stralen van licht met gelijke intensiteit door de koppelaar; en waarbij de twee lichtstralen worden teruggekaatst door de reflecterende lagen, weer door de koppelaar gaan en de isolator passeren om de fotodetector te bereiken.8 AO 19.10.1074 EN Conclusions I. A tapered acceleration sensor fiber system, characterized in that it comprises a protective cover, an elastic base layer, a light source, a circulator, a coupler, a fiber phase modulator / demodulator, an insulator and a photo detector ; wherein the elastic base layer is disposed in the protective shell to divide a cavity in the protective shell into an upper sub-cavity and a lower sub-cavity; a top surface and a bottom surface, respectively, of the elastic base layer is provided with assemblies of feel fibers for detecting deformation; the fiber fiber assemblies are connected to the fiber phase modulator and demodulator respectively; the light source is coupled to the circulator; the circulator is coupled to the coupler and the photodetector respectively; the coupler is connected to the isolator and the fiber phase modulator and demodulator, respectively; the isolator is coupled to the photo detector; the ends of the sensor fiber assemblies have reflective layers; monochromatic light generated by the light source is split into two beams of light of equal intensity by the coupler; and wherein the two rays of light are reflected off the reflective layers, pass through the coupler and pass the insulator to reach the photodetector. 2. Taps toelopend vezelsysteem van versnellingssensor volgens conclusie 1, met het kenmerk, dat de reflecterende lagen coatinglagen zijn.A tapered acceleration sensor fiber system according to claim 1, characterized in that the reflective layers are coating layers. 3. Taps toelopend vezelsysteem van versnellingssensor volgens conclusie 1, met het kenmerk, dat de vezelfase modulator / demodulator een PZT-modulator / demodulator omvat.A tapered acceleration sensor fiber system according to claim 1, characterized in that the fiber phase modulator / demodulator comprises a PZT modulator / demodulator. 4. Taps toelopend vezelsysteem van versnellingssensor volgens conclusie 1, met het kenmerk, dat de sensorvezelsamenstellen een flexibele cilinder, een gevoelig massablok en een sensorvezel omvatten; de flexibele cilinder is verbonden met het gevoelige massablok; het gevoelige massablok is gekoppeld met de detectievezel; en waarbij beide uiteinden van de vezel zijn bedekt met de reflecterende lagen.A tapered acceleration sensor fiber system according to claim 1, characterized in that the sensor fiber assemblies comprise a flexible cylinder, a sensitive ground block and a sensor fiber; the flexible cylinder is connected to the sensitive ground block; the sensitive ground block is coupled to the detection fiber; and wherein both ends of the fiber are covered with the reflective layers. 9 AO 19.10.1074 NL9 AO 19.10.1074 NL 5. Taps toelopend vezelsysteem van versnellingssensor volgens conclusie 4, met het kenmerk, dat het gevoelige massablok de vorm heeft van een driehoekige piramide; en een piramide bovenkant van het gevoelige massablok in contact komt met de vezel.A tapered acceleration sensor fiber system according to claim 4, characterized in that the sensitive ground block has the shape of a triangular pyramid; and a pyramid top of the sensitive ground block comes into contact with the fiber. 6. Taps toelopend vezelsysteem van versnellingssensor volgens conclusie 1, met het kenmerk, dat de beschermende schaal is voorzien van een opening voor het verbinden van de holte met de buitenzijde.A tapered acceleration sensor fiber system according to claim 1, characterized in that the protective shell is provided with an opening for connecting the cavity to the outside. 7. Taps toelopend vezelsysteem van versnellingssensor volgens conclusie 6, met het kenmerk, dat een buitenomtrek van de beschermende schaal de vorm heeft van een rechthoekig blok.A tapered acceleration sensor fiber system according to claim 6, characterized in that an outer periphery of the protective shell is in the form of a rectangular block. 8. Taps toelopend vezelsysteem van versnellingssensor volgens conclusie 1, met het kenmerk, dat een binnenwand van de holte 1s voorzien van een cirkel van klemgroeven; en de rand van de elastische basislaag in de klemgroeven wordt geklemd.8. A tapered acceleration sensor fiber system according to claim 1, characterized in that an inner wall of the cavity is provided with a circle of clamping grooves; and the edge of the elastic base layer is clamped in the clamp grooves. 9. Taps toelopend vezelsysteem van versnellingssensor volgens conclusie 8, met het kenmerk, dat de elastische basislaag de vorm heeft van een rechthoekige plaat.A tapered acceleration sensor fiber system according to claim 8, characterized in that the elastic base layer is in the form of a rectangular plate. 10. Taps toelopend vezelsysteem van versnellingssensor volgens conclusie 8, met het kenmerk, dat in de klemgroeven lijmen zijn aangebracht.A tapered acceleration sensor fiber system according to claim 8, characterized in that adhesives are provided in the clamping grooves.
NL2023992A 2019-04-12 2019-10-10 Tapered fiber optic acceleration sensor system NL2023992B1 (en)

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