EP3322991A1 - Faseroptischer beschleunigungssensor - Google Patents
Faseroptischer beschleunigungssensorInfo
- Publication number
- EP3322991A1 EP3322991A1 EP16766258.4A EP16766258A EP3322991A1 EP 3322991 A1 EP3322991 A1 EP 3322991A1 EP 16766258 A EP16766258 A EP 16766258A EP 3322991 A1 EP3322991 A1 EP 3322991A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fiber
- optical fiber
- acceleration sensor
- mirror
- core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000000835 fiber Substances 0.000 claims abstract description 51
- 239000013307 optical fiber Substances 0.000 claims abstract description 30
- 230000001133 acceleration Effects 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 238000005253 cladding Methods 0.000 claims description 10
- 230000010355 oscillation Effects 0.000 abstract description 3
- 239000003365 glass fiber Substances 0.000 description 16
- 239000011521 glass Substances 0.000 description 12
- 230000035945 sensitivity Effects 0.000 description 7
- 239000004809 Teflon Substances 0.000 description 3
- 229920006362 Teflon® Polymers 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241001282736 Oriens Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
-
- 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
- G01D5/268—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 using optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
- G01H9/006—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors the vibrations causing a variation in the relative position of the end of a fibre and another element
Definitions
- the fiber optic acceleration sensor relates to a fiber-optic accelerometer ⁇ sensor, in particular for use in a generator.
- AI acceleration ⁇ sensor uses the approach to convert the deflection of a free-standing the end of an optical fiber into a change in intensity of a light signal by the detached end of the fiber is directed to a tilted mirror.
- the resonant frequency of the sensor is defined by the elastic modulus, the moment of inertia, the density and the length of the free-standing fiber.
- the SENS ⁇ friendliness of the sensor corresponds to the deflection at the fiber end and is described by the same parameters.
- the relationship between the resonant frequency and the displacement / sensitivity of the sensor is indirectly proportional, ie an increased resonant frequency reduces the deflection on the sensor
- Fiber end an increase in the sensitivity reduced ⁇ vice returns the resonant frequency of the sensor.
- the fiber optic accelerometer includes fully an optical fiber that has a freestanding end ⁇ , wherein the free-standing end is vibrated under the influence of Be ⁇ acceleration, and these vibrations are detected as a measure of the acceleration. It further comprises a light source for emitting sichtba ⁇ rem, ultraviolet or infrared light in the optical fiber at a freestanding end facing away from the end of the fiber, a mirror which is arranged, a part of emerging from the freestanding end of light in the optical fiber and a detection device for receiving reflected light at the end remote from the freestanding end of the fiber.
- the opti cal ⁇ fiber is a double clad fiber, as DCF (double clad fiber), respectively.
- the mirror reflectors ⁇ oriented light is incident on the fiber end face and there from the inner cladding (ie, the second, larger core) are coupled with a greater numerical aperture also significantly larger angles and managed as with a simple opti ⁇ fiber.
- the double sheath fiber comprises a core, an inner and an outer sheath.
- Core and inner cladding are preferably formed as a multi-mode waveguide, since thus a higher signal quality can be achieved than with singlemode waveguide.
- the core has a smaller numerical aperture than the inner cladding.
- the core may have a numerical aperture of 0.075 to 0.14 while the inner cladding has a numerical aperture of between 0.22 and 0.5.
- the core of the optical fiber may have a free-standing end Bragg grating.
- this Bragg grating can be used to measure the temperature of the sensor in the region of the freestanding end.
- signal errors caused by temperature changes can be corrected by calculation.
- the Bragg grating is close to the free-standing end of the optical fiber, for example, in the 25% of the optical fiber closest to the fiber termination of the freestanding end of the fiber.
- the detection device further comprises means for determining the reflection wavelength of the Bragg grating, which is a measure of the temperature.
- the reflected portion of a radiation coupled to the nucleus is spectrally analyzed in a manner known for Bragg gratings.
- the core of the optical fiber is designed as a single-mode core, as this ei ⁇ ne simplified evaluation of the Bragg grating signal is possible.
- Sizes for the core of the optical fiber may be, for example, 50 ym or 62.5 ym as a multimode core or, for example, 25 ym as an intermediate size, so-called Few mode.
- the inner cladding as a multimode core may have both standard sizes such as 62.5ym for the case of a single-mode core and larger diameters such as 200ym or 400ym. Further advantageous embodiments and further developments of the invention include:
- the length of the fiber is expediently small enough to be selected.
- the largest possible fiber length is advantageous.
- a fiber length of between 12 and 18 mm for the free-standing end is used for a standard multimode fiber 62/125 ym.
- a fiber length of between 15 and 17 mm is selected and according to an advantageous embodiment, the fiber length is 16 mm.
- a fiber length of 16 mm has been found to be advantageous in terms of resonance frequency and sensitivity.
- a flywheel is preferably only the weight of the optical fiber.
- an 8 ° break of the end face is used according to an advantageous embodiment of the invention.
- the azimuthal orientation of the fiber end relative to the mirror is expediently chosen so that the fracture and the mirror surface include the maximum possible angle.
- breakage and mirror surface forming the shape of a "V" The oblique end face of the light is slightly down -. Broken out of the fiber by approximately 3.5 ° - un ⁇ th with respect to the shape of the "V" , This reduces the effective angle of incidence on the mirror.
- the mirror is tilted by between 9 ° and 13 °.
- the azimuthal Orien ⁇ orientation of the fiber end relative to the mirror is advantageously again that the fracture and the mirror surface angle including the maximum possible so selected.
- breakage and the mirror surface form an the shape of a "V".
- ⁇ sondere the mirror is tilted by 11 °.
- mirrors and fiber ends may also be arranged to each other such that the included angle is minimized.
- the inclined mirror surface and the break form a parallelogram-like arrangement.
- the distance of the glass fiber is from Spie ⁇ gel between 25 and 75 ym is advantageous.
- the described configuration advantageously results in a relatively linear sensor characteristic curve between acceleration values of 0 and 10 g with a sensitivity of approximately 1% / g.
- the elements of the sensor head ⁇ preferably are designed cylindrically symmetrical.
- the cylindrical sensor is then inserted into a rectangular block.
- a Teflon hose acts ⁇ 3 - 5 mm diameter, in which the glass fiber is loosely laid.
- a plug for optical fibers for example, type FC-APC or E-2000.
- Figure 1 shows a fiber optic acceleration sensor with a glass fiber and a mirror
- Figure 2 shows a detail of the fiber optic acceleration sensor in an enlarged view
- FIG. 3 shows a longitudinal section through a first glass fiber;
- the fiber-optic acceleration sensor 10 shown in FIG. 1 comprises, as an essential element, a glass fiber 11. This is designed as a double-cladding fiber. A 16 mm long section of fiberglass 11 is freestanding. At the end of this Section ends the glass fiber 11. Following the free ⁇ standing section, the glass fiber 11 is fixed in a guide member 16. In the further course, the glass fiber 11 is guided loosely in a 3.7 mm diameter Teflon tube 15.
- the end of the Teflon tube 15 is included along with the Füh ⁇ approximately element 16 of a first sleeve 19th To the first sleeve 19, a second sleeve 12 is provided.
- the second sleeve 12 extends from the region of the first sleeve over the free-standing portion of the optical fiber 11.
- the second sleeve 12 finds a tapered at an angle of 11 ° ⁇ th degree, the 12 in the cylindrical second sleeve 12 in an annular, bevelled end 17 shows.
- the second sleeve 12 itself is open at this point, but is closed by an Al-glass mirror 14.
- the Al glass mirror 14 is glued to the beveled end so that the Al glass mirror 14 itself is mounted obliquely to the normal plane of the fiber axis.
- a block-shaped element 13 encloses the previously beschrie ⁇ surrounded construction of the height of the Al-glass mirror 14 to the ERS ⁇ th sleeve 19.
- the sleeves 19, 12 and the block-shaped element 13 as well as the Al-glass mirror 14 and the réellesele ⁇ ment 16, the freestanding portion of the optical fiber 11 is completed völ ⁇ lig of the outside world, so that no disturbing influences from the outside to a measurement.
- the cuboidal element 13 and the sleeve 12 may also be fused into a single component.
- FIG 2 An enlarged, but not true to scale representation of the end of the glass fiber 11 in relation to the Al-glass mirror 14 is shown in FIG 2.
- the light is re ⁇ inflected and a part of the light re-enters the Glasfa ⁇ ser 11.
- the Al-glass mirror 14, which is not fully displayed in the enlargement shown in Figure 2, is at an angle 18 of 11 ° to the normal plane of the optical fiber axis angeord ⁇ net.
- the distance 21 between the end of the glass fiber 11 and the Al glass mirror 14 is 50 ym in this example.
- FIG. 3 shows a longitudinal section through the glass fiber 11.
- the glass fiber 11 comprises a core 30, an inner shell 31 and an outer shell 32.
- the multimode core shown here has a diameter of 62.5 ym while the diameter of the inner shell 200 ym is.
- the core 30 serves to direct the light to the freestanding end of the glass fiber 11 and thus to the Al glass mirror 14.
- the core 30 is designed so that it has a small numerical aperture and therefore a low emission angle 33.
- the numerical aperture here is 0.1.
- the inner shell 31 has a larger numerical aperture and thus a larger acceptance angle 34, can be coupled under the light.
- the specific Numbers ⁇ aperture here is 0.3.
- FIG. 3 does not reproduce the emission angles or acceptance angles in an angular manner. In the inner jacket, the light beam reflected back from the Al glass mirror 14 is coupled back in and guided back to the detector.
- the angle 18 under which the Al glass mirror 14 is tilted relative to the vertical arrangement can be increased.
- an angle of 12 ° or more, in particular 15 ° can be selected.
- the case lost optical power is not as great as it would be with Ver ⁇ application of a simple optical fiber and is counterbalanced and outweighed by the gain in signal resolution by the increased angle and the associated increased signal strength at deflection of the glass fiber.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Couplings Of Light Guides (AREA)
- Optical Transform (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015217434.4A DE102015217434A1 (de) | 2015-09-11 | 2015-09-11 | Faseroptischer Beschleunigungssensor |
PCT/EP2016/070947 WO2017042150A1 (de) | 2015-09-11 | 2016-09-06 | Faseroptischer beschleunigungssensor |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3322991A1 true EP3322991A1 (de) | 2018-05-23 |
Family
ID=56936393
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16766258.4A Withdrawn EP3322991A1 (de) | 2015-09-11 | 2016-09-06 | Faseroptischer beschleunigungssensor |
Country Status (6)
Country | Link |
---|---|
US (1) | US20180267077A1 (de) |
EP (1) | EP3322991A1 (de) |
KR (1) | KR20180049078A (de) |
CN (1) | CN108027387A (de) |
DE (1) | DE102015217434A1 (de) |
WO (1) | WO2017042150A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018140085A1 (en) * | 2017-01-26 | 2018-08-02 | Lubrizol Advanced Materials, Inc. | Hair styling appliances and methods of operating same |
CN114314239A (zh) * | 2022-03-07 | 2022-04-12 | 山东梯配网络科技有限公司 | 一种基于物联网的电梯困人自动报警系统 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5108183A (en) * | 1989-08-31 | 1992-04-28 | The Board Of Trustees Of The Leland Stanford Junior University | Interferometer utilizing superfluorescent optical source |
DE19514852C2 (de) * | 1995-04-26 | 1997-07-03 | Deutsche Forsch Luft Raumfahrt | Verfahren und Anordnung zur Beschleunigungs- und Vibrationsmessung |
US5633960A (en) * | 1996-01-24 | 1997-05-27 | The United States Of America As Represented By The Secretary Of The Navy | Spatially averaging fiber optic accelerometer sensors |
US7714271B1 (en) | 2007-11-05 | 2010-05-11 | United States Oil And Gas Corp. | Simple fiber optic seismometer for harsh environments |
CN101424696B (zh) * | 2008-12-05 | 2010-06-02 | 重庆大学 | 全光纤温度自补偿微型f-p加速度传感器及制作方法 |
DE102010019813A1 (de) | 2010-05-06 | 2011-11-10 | Siemens Aktiengesellschaft | Faseroptischer Vibrationssensor |
CN101833016B (zh) * | 2010-05-17 | 2012-02-01 | 哈尔滨工程大学 | 基于熔嵌芯式双芯保偏光纤的微加速度传感器 |
US8879067B2 (en) * | 2010-09-01 | 2014-11-04 | Lake Shore Cryotronics, Inc. | Wavelength dependent optical force sensing |
EP2671057B1 (de) | 2011-02-04 | 2014-07-30 | Helmholtz Zentrum München Deutsches Forschungszentrum für Gesundheit und Umwelt (GmbH) | Ultraschalldetektor und optoakustische oder thermoakustische bilddarstellung |
CN102721828B (zh) * | 2012-07-06 | 2014-01-29 | 重庆大学 | 具有滑动反射镜式温度自补偿光纤加速度传感器 |
CN203658394U (zh) * | 2013-11-11 | 2014-06-18 | 董小华 | 一种采用光纤光栅的加速度传感器 |
-
2015
- 2015-09-11 DE DE102015217434.4A patent/DE102015217434A1/de not_active Withdrawn
-
2016
- 2016-09-06 CN CN201680051988.1A patent/CN108027387A/zh active Pending
- 2016-09-06 KR KR1020187010135A patent/KR20180049078A/ko not_active Application Discontinuation
- 2016-09-06 US US15/758,444 patent/US20180267077A1/en not_active Abandoned
- 2016-09-06 WO PCT/EP2016/070947 patent/WO2017042150A1/de active Application Filing
- 2016-09-06 EP EP16766258.4A patent/EP3322991A1/de not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
DE102015217434A1 (de) | 2017-03-30 |
WO2017042150A1 (de) | 2017-03-16 |
US20180267077A1 (en) | 2018-09-20 |
CN108027387A (zh) | 2018-05-11 |
KR20180049078A (ko) | 2018-05-10 |
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RIC1 | Information provided on ipc code assigned before grant |
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