WO2021095841A1 - Dispositif d'émission de lumière laser - Google Patents

Dispositif d'émission de lumière laser Download PDF

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Publication number
WO2021095841A1
WO2021095841A1 PCT/JP2020/042411 JP2020042411W WO2021095841A1 WO 2021095841 A1 WO2021095841 A1 WO 2021095841A1 JP 2020042411 W JP2020042411 W JP 2020042411W WO 2021095841 A1 WO2021095841 A1 WO 2021095841A1
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WO
WIPO (PCT)
Prior art keywords
lens
optical system
laser light
holding member
expansion
Prior art date
Application number
PCT/JP2020/042411
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English (en)
Japanese (ja)
Inventor
裕介 渡邊
義瑞 飯田
知弘 梶山
聖也 井上
渡辺　正浩
達雄 針山
Original Assignee
株式会社日立パワーソリューションズ
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Application filed by 株式会社日立パワーソリューションズ filed Critical 株式会社日立パワーソリューションズ
Publication of WO2021095841A1 publication Critical patent/WO2021095841A1/fr

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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
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/26—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses

Definitions

  • the present invention relates to a laser light emitting device.
  • the large airflow measuring means irradiates a floating minute substance (called an object) in the air near the nacelle of a wind turbine arranged at a specific altitude from the ground with a laser beam before and after the object moves.
  • a method of measuring the atmospheric flow at a specific altitude from the ground by capturing the reflected waves from the object and capturing the minute frequency fluctuations of these reflected waves due to the Doppler effect is used.
  • the measurement means is composed of a laser light emitting device that emits laser light and an analyzer that captures and analyzes the reflected wave thereof, and the present invention relates to the laser light emitting device.
  • the laser beam emitting device includes a laser beam emitting unit having a laser beam emitting unit that emits a laser beam, a lens barrel, a plurality of optical system lenses, and a lens holding member that holds the optical system lens in the lens barrel. It is composed of a position adjusting means for engaging the optical system unit, the laser beam emitting unit and the optical system unit, and adjusting the position of the laser beam irradiation unit of the laser beam emitting unit.
  • the laser beam emitting device irradiates an object with laser light with high accuracy by maintaining the positional relationship from the laser beam emitting portion to the first optical system lens and from the laser light emitting portion to the second optical system lens. Is.
  • Patent Document 1 discloses a temperature-corrected optical device that prevents fluctuations in the focal position as an optical device even when the length of the lens barrel is changed due to a temperature change in an optical device composed of a lens barrel and a lens. Has been done.
  • an optical device (colimeter) composed of a lens barrel whose tube length is changed by a temperature change and a lens held in the lens barrel
  • the focal length of the lens is changed according to the temperature change. It is disclosed that the lens is formed of a material that can be changed and that the change in the focal length and the change in the length of the lens barrel cancel each other out to hold the focal position of the lens at a fixed position.
  • it is difficult to adjust the focal length of the lens in response to a temperature change and there is a difficulty in feasibility.
  • the present invention has been made to solve the above-mentioned problems, and accurately irradiates an object existing at a specific altitude from the ground in response to the influence of fluctuations in the ambient temperature of the installation site. It is an object of the present invention to provide a laser light emitting device capable of the above.
  • the laser beam emitting device of the present invention includes a laser beam emitting unit having a laser beam emitting unit for emitting laser light, a lens barrel, a first optical system lens, and a second optical system.
  • the optical system unit including the lens, and the position of the laser light emitting portion of the laser light emitting unit, which is arranged at an intermediate position between the laser light emitting unit and the optical system unit and engages with the laser light emitting unit and the optical system unit. It is configured to include a position adjusting means for adjusting (the size of the distance between the laser beam emitting unit and the optical system unit).
  • the position adjustment means expansion and contraction amount indicating the amount of influence on the position adjustment means and the mirror showing the amount of influence on the lens barrel. It is composed of a first member having a characteristic of maintaining a positional relationship between a laser beam emitting portion and a first optical system lens so as to correct a deviation in the irradiation position of the laser beam due to the amount of expansion and contraction of the cylinder.
  • a second member is composed of a first lens holding member that holds the first optical system lens and a second member that has a characteristic of holding a positional relationship between the laser beam emitting portion and the second optical system lens. It is characterized by including a second lens holding member for holding an optical system lens.
  • the present invention it is possible to accurately irradiate an object existing at a specific altitude from the ground even if the ambient temperature of the laser light emitting device fluctuates.
  • FIG. 1 is a diagram showing an outline of a laser Doppler speedometer including a laser light emitting device 100 according to the present embodiment.
  • the laser Doppler velocimeter generates laser light with the light source unit 40, irradiates the object in the atmosphere with the laser light, acquires the reflected wave from the object, and measures the moving speed of the object by the Doppler effect.
  • the laser light emitting device 100 is included in the laser Doppler velocimeter and is used to accurately irradiate an object with laser light.
  • the laser light emitting device 100 includes a laser light emitting unit 10 having a laser light emitting unit 11 that emits laser light, a lens barrel 27 (see FIG. 2), a first optical system lens 21, and a second optical system lens.
  • the optical system unit 20 including the 22 and the laser light emitting unit 10 and the optical system unit 20 are arranged at an intermediate position and engaged with the laser light emitting unit 10 and the optical system unit 20 to engage with the laser of the laser light emitting unit 10. It includes a position adjusting means 30 for adjusting the position of the light emitting unit 11 (the size of the distance between the laser light emitting unit 10 and the optical system unit 20).
  • the laser light emitting device 100 Since the laser light emitting device 100 is used throughout the year including midwinter and midsummer, it is necessary to correct the fluctuation amount of the laser light emitting device 100 and keep the focal length constant when a temperature fluctuation occurs. This is because the laser light emitting device 100 according to the present embodiment is used for weather prediction for predicting the amount of power generation of the wind turbine, and the height near the nacelle of the wind turbine (rotation axis of the wind turbine: height about 100 m from the ground). This is because it is necessary to accurately irradiate an object at a specific altitude from the ground with a laser beam in order to accurately measure the atmospheric flow. Therefore, the laser light emitting device 100 needs to maintain the focal length even if the temperature fluctuates.
  • the focal length of the laser light emitting device 100 changes by 0.1 mm to 0.2 mm
  • the focal length 100 m ahead changes by several tens of meters, which greatly deviates from the target nacelle height. Bring results. Therefore, a method of correcting the fluctuation amount of the laser light emitting device 100 will be described below with reference to FIGS. 2 to 5.
  • FIG. 2 is a diagram showing details of the laser light emitting device 100 according to the present embodiment.
  • the laser light emitting device 100 has a position adjusting means expansion / contraction amount X11 (see FIG. 4) indicating the amount of influence on the position adjusting means 30 and a lens barrel showing the amount of influence on the lens barrel when a temperature fluctuation occurs. It is composed of a first member 23m having a characteristic of maintaining a positional relationship between the laser light emitting portion 11 and the first optical system lens 21 so as to correct the deviation of the irradiation position of the laser light due to the amount of expansion and contraction.
  • first lens holding member 23 that holds the first optical system lens 21
  • second member 24 m that has a characteristic of holding a positional relationship between the laser light emitting portion 11 and the second optical system lens 22.
  • a second lens holding member 24 for holding the second optical system lens 22 is provided.
  • the laser beam emitting device 100 includes a laser beam emitting unit 11, a center point (optical axis) of the incident hole 25 of the lens barrel 27 in which the laser beam is incident on the optical system unit 20, and a center point (optical axis) of the emitting hole 26.
  • the axis) is arranged on the same straight line, and the position adjusting means 30 is provided with a laser beam passing hole 32 having a center point (optical axis) on the same straight line (on the optical axis).
  • FIG. 2 shows a state in which the laser light emitting device 100 is operating normally without causing temperature fluctuation.
  • the laser light emitting part is the origin x0, the distance from the origin x0 to the incident hole position x1 (the length of the position adjusting means) is X1, the distance from the origin x0 to the first lens position x2 is X2, and the distance from the origin x0 to the second Let X3 be the distance to the lens position x3.
  • X2 and X3 in order to accurately irradiate the object with the laser beam, it is necessary to maintain the distances of X2 and X3. The method of maintaining the distance between X2 and X3 will be described later with reference to FIG.
  • the amount of expansion and contraction thereof is calculated as follows.
  • the total length of the lens barrel is 200 mm, and the temperature fluctuation is 60 ° C. from -10 ° C in midwinter to 50 ° C in midsummer. Since the coefficient of linear expansion of the aluminum alloy A2017 is 23.6 ⁇ 10-6 / ° C, the amount of dimensional variation of the lens barrel is calculated to be 0.2832 mm by 23.6 ⁇ 10-6 ⁇ 200 ⁇ 60. To.
  • FIG. 3 is a diagram showing the configuration of the position adjusting means 30.
  • the position adjusting means 30 adjusts the position of the laser light emitting unit 11 of the laser light emitting unit 10, and turns the screw mechanism 31 to bring the laser light emitting unit 10 and the optical system unit 20 together. The size of the interval can be adjusted. By turning the screw mechanism 31 to the right, the laser light emitting unit 11 moves away from the lens barrel 27, and by turning the screw mechanism 31 to the left, the laser light emitting unit 11 moves toward the lens barrel 27. To do.
  • An aluminum alloy is generally used for the position adjusting means 30.
  • FIG. 4 is a diagram showing a correction method for improving the influence of temperature fluctuation according to the present embodiment, (a) is a comparative example, and (b) is an example of the present embodiment.
  • FIG. 4A is a diagram showing a laser light emitting device to which the present invention is not applied in a state of being affected by temperature fluctuations.
  • the distance from the origin x0 after being affected at each position is calculated as follows.
  • Distance to x1 X1 + X11 ...
  • Distance to x2 X2 + (X11 + X21) ...
  • Distance to x3 X3 + (X11 + X31) ...
  • X11 the amount of expansion and contraction indicating the amount of influence of temperature fluctuation
  • the amount of expansion and contraction of the position adjusting means 30 in the x-axis + direction the amount of expansion and contraction of the position adjusting means
  • X21 the amount of expansion and contraction indicating the amount of influence of temperature fluctuation.
  • the amount of expansion and contraction of the lens barrel 27 in the x-axis + direction (the amount of expansion and contraction of the first lens barrel) at the first lens position x2 of the arrangement position of the optical system lens 21, X31: expansion and contraction indicating the amount of influence of temperature fluctuation.
  • This is the amount of expansion and contraction of the lens barrel 27 in the x-axis + direction (the amount of expansion and contraction of the second lens barrel) at the second lens position x3 of the arrangement position of the optical system lens 22.
  • FIG. 4B is an example of the present embodiment and shows the correction of expansion and contraction due to the influence of temperature fluctuation.
  • the position adjusting means expansion / contraction amount X11, the first lens barrel expansion / contraction amount X21, and the second lens barrel expansion / contraction amount X31, which are the expansion / contraction amounts caused by the influence of temperature fluctuation, are set to zero, that is, FIG. 4A.
  • the position of the first lens position x2 moved due to the influence of the temperature fluctuation is corrected as the position of the new first lens position x2 in FIG. 4B, and the influence of the temperature fluctuation is shown in FIG. 4A.
  • the first lens holding member and the second lens holding member are expanded and contracted so as to correct the position of the second lens position x3 moved by the above as the position of the new second lens position x3 in FIG. 4 (b).
  • the configuration is such that the arrangement positions of the first optical system lens and the second optical system lens are moved in the opposite direction (x-axis-direction) by the same amount as the amount to correct the lens.
  • Distance to x2 X2 + (X11 + X21)-(X11 + X21) ...
  • Distance to x3 X3 + (X11 + X31)-(X11 + X31) ...
  • a material having an expansion / contraction amount of ⁇ (X11 + X31) with respect to temperature fluctuation is used.
  • Table 1 shows examples of the first member 23 m and the second member 24 m.
  • A2017 is a heat-treated aluminum alloy having excellent machinability and strength, and is also known as duralumin.
  • Aluminum containing Cu (copper) tends to have high strength and low workability (plastic working).
  • A5056 is an aluminum alloy having excellent corrosion resistance and a good surface finish by cutting.
  • the laser beam emitting portion 11 is set as the origin x0, the position adjusting means expansion / contraction amount X11 in the longitudinal direction of the laser light emitting device 100, and the arrangement of the first optical system lens 21. It has a first expansion / contraction characteristic that expands / contracts by the same amount as the first total expansion / contraction amount (X11 + X21), which is the total expansion / contraction amount of the first lens barrel expansion / contraction amount X21 at the first lens position x2, which is the position. It is a member.
  • the second member 24m has the laser beam emitting unit 11 as the origin x0, the position adjusting means expansion / contraction amount X11 in the longitudinal direction of the laser beam emitting device 100, and the arrangement of the second optical system lens 22. It has a second expansion / contraction characteristic that expands / contracts by the same amount as the second total expansion / contraction amount (X11 + X31), which is the total expansion / contraction amount of the second lens barrel expansion / contraction amount X31 at the second lens position x3, which is the position. It is a member.
  • the first lens holding member 23 and the second lens holding member 24 hold the first optical system lens 21 and the second optical system lens 22 in the longitudinal direction of the lens barrel. Has the required size for.
  • the first position is a position where the first optical system lens 21 and the second optical system lens 22 are held in the lens barrel 27 so as to irradiate the laser beam at a desired position in a state where the temperature does not fluctuate.
  • a first lens holding member 23 and a second lens holding member 24 are arranged at the lens position x2 and the second lens position x3, respectively.
  • the first lens holding member 23 and the second lens holding member 24 are end portions on the exit hole 26 side where the laser beam is emitted from the optical system unit 20 so as to expand and contract toward the laser beam emitting portion 11 side when the temperature fluctuates. Is fixed to the inner wall of the lens barrel 27 (see the fixed portion 28). As a result, when the temperature fluctuates (rises), the first member 23m and the second member 24m extend toward the laser beam emitting portion 11, and the extension of the position adjusting means 30 and the lens barrel 27 can be cancelled. ..
  • FIG. 5 is a diagram showing a configuration of a lens holding member according to the present embodiment, in which (a) is a pair-type mounting member and (b) is an annular mounting member.
  • the first lens holding member 23 will be described as an example, but the same applies to the second lens holding member 24.
  • the first lens holding member 23 has a predetermined width in the circumferential direction of the inner wall of the lens barrel 27, and is sandwiched between the first optical system lenses 21 at opposite positions. It has the above.
  • the first lens holding member 23 is formed in an annular shape in the circumferential direction so as to surround the periphery of the first optical system lens 21.
  • the first lens holding member 23 has a predetermined width in the circumferential direction of the inner wall of the lens barrel 27, and a pair or more of the first lens holding members 23 sandwich the first optical system lens 21 at opposite positions.
  • the second lens holding member 24 has a predetermined width in the circumferential direction of the inner wall of the lens barrel 27, and is provided with a pair or more so as to sandwich the second optical system lens 22 at opposite positions. You may.
  • the first lens holding member 23 is formed in an annular shape in the circumferential direction so as to surround the periphery of the first optical system lens 21, and the second lens holding member 24 surrounds the periphery of the second optical system lens 22. It may be formed in an annular shape in the circumferential direction as described above.
  • the first lens holding member 23 includes a pair or more so as to sandwich the first optical system lens 21 at a position opposite to each other, and the second lens holding member 24 surrounds the periphery of the second optical system lens 22. It may be formed in an annular shape in the circumferential direction as described above.
  • the second lens holding member 24 includes a pair or more so as to sandwich the second optical system lens 22 at a position opposite to each other, and the first lens holding member 23 surrounds the periphery of the first optical system lens 21. It may be formed in a ring shape in the circumferential direction.
  • the first member 23m and the second member 24m expand and contract toward the laser beam emitting portion 11 side according to the fluctuation of the ambient temperature, and cancel the expansion and contraction of the position adjusting means 30 and the lens barrel 27. be able to. This makes it possible to accurately irradiate the object with the laser light even if the ambient temperature of the laser light emitting device 100 fluctuates.
  • CFRP Carbon Fiber Reinforced Plastic
  • CFRP is a fiber reinforced plastic that uses carbon fiber as a reinforcing material.
  • Epoxy resin is mainly used as the base material of CFRP, and it is also simply called carbon resin or carbon.
  • the first lens barrel expansion / contraction amount X21 and the second lens barrel expansion / contraction amount X31 are zero. (Including an error), the first total expansion / contraction amount (X11 + X21) and the second total expansion / contraction amount (X11 + X31) are made of a material equal to the position adjustment means expansion / contraction amount X11, respectively, and the first lens holding member. And the second lens holding member may be configured.
  • the position adjusting means expansion / contraction amount X11 is zero (including an error), and the first total expansion / contraction amount is zero.
  • (X11 + X21) is a material equal to the first lens barrel expansion / contraction amount X21, constitutes the first lens holding member 23, and the second total expansion / contraction amount (X11 + X31) is the second lens barrel expansion / contraction amount X31.
  • the second lens holding member 24 may be made of the same material.
  • the first member 23m and the second member 24m expand and contract toward the laser beam emitting portion 11 side according to the temperature fluctuation, and the expansion and contraction of the position adjusting means 30 or the lens barrel 27 can be canceled. .. This makes it possible to accurately irradiate the object with the laser beam even if the temperature fluctuates.
  • Laser light emitting unit 11 Laser light emitting unit 20
  • Optical system unit 21 First optical system lens 22
  • Second optical system lens 23 First lens holding member 23m First member 24
  • Second lens holding member 24m Second 25
  • Incident hole 26 Exit hole 27
  • Lens barrel 28 Fixed part 30
  • Position adjustment means 32 Laser light passage hole 40
  • Light source unit 100 Laser light emission device x0 Origin (reference point) x1 Incident hole position x2 First lens position x3 Second lens position X1 Distance from origin x0 to incident hole x1 X2 Distance from origin x0 to first lens position x2 X3 Origin x0 to second lens position x3 Distance X11
  • Position adjustment means Expansion / contraction amount X21 First lens barrel expansion / contraction amount X31 Second lens barrel expansion / contraction amount

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Lens Barrels (AREA)

Abstract

L'invention concerne un dispositif d'émission de lumière laser (100) qui est pourvu, afin de corriger le déplacement d'une position d'irradiation de lumière laser en raison d'une quantité d'expansion/contraction de moyen de positionnement indiquant la quantité d'influence sur un moyen de positionnement (30) et une quantité d'expansion/contraction de corps de barillet de lentille indiquant la quantité d'influence sur un corps de barillet de lentille lorsque la fluctuation de température se produit dans un environnement ambiant dans lequel le dispositif d'émission de lumière laser (100) est installé, un premier élément de maintien de lentille (23) qui comprend un premier élément (23m) ayant une propriété de maintien d'une relation de position entre une partie d'émission de lumière laser (11) et une première lentille de système optique (21) et maintient la première lentille de système optique (21), et un second élément de maintien de lentille (24) qui comprend un second élément (24m) ayant une propriété de maintein d'une relation de position entre la partie d'émission de lumière laser (11) et une seconde lentille de système optique (22), et maintient la seconde lentille de système optique (22).
PCT/JP2020/042411 2019-11-15 2020-11-13 Dispositif d'émission de lumière laser WO2021095841A1 (fr)

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JP2019207195A JP6656463B1 (ja) 2019-11-15 2019-11-15 レーザ光出射装置
JP2019-207195 2019-11-15

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0259717A (ja) * 1988-08-25 1990-02-28 Canon Inc レーザーユニット
JPH06130267A (ja) * 1992-10-14 1994-05-13 Asahi Optical Co Ltd 温度補正型光学装置
JP2001067701A (ja) * 1999-08-31 2001-03-16 Sony Corp 光学ヘッド、記録再生装置及び光学ヘッドの駆動方法
JP2002014269A (ja) * 2000-06-29 2002-01-18 Sony Corp 光学装置
JP2015038467A (ja) * 2013-07-18 2015-02-26 パナソニックＩｐマネジメント株式会社 病理診断支援装置及び病理診断支援方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6427857B2 (ja) * 2013-07-17 2018-11-28 株式会社リコー 変位測定装置および変位測定方法および画像形成装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0259717A (ja) * 1988-08-25 1990-02-28 Canon Inc レーザーユニット
JPH06130267A (ja) * 1992-10-14 1994-05-13 Asahi Optical Co Ltd 温度補正型光学装置
JP2001067701A (ja) * 1999-08-31 2001-03-16 Sony Corp 光学ヘッド、記録再生装置及び光学ヘッドの駆動方法
JP2002014269A (ja) * 2000-06-29 2002-01-18 Sony Corp 光学装置
JP2015038467A (ja) * 2013-07-18 2015-02-26 パナソニックＩｐマネジメント株式会社 病理診断支援装置及び病理診断支援方法

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