CN110346308A - A kind of electronic speckle spectrometer of intermode interference - Google Patents

A kind of electronic speckle spectrometer of intermode interference Download PDF

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Publication number
CN110346308A
CN110346308A CN201810282920.5A CN201810282920A CN110346308A CN 110346308 A CN110346308 A CN 110346308A CN 201810282920 A CN201810282920 A CN 201810282920A CN 110346308 A CN110346308 A CN 110346308A
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fibre
spectrometer
area array
array ccd
speckle
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CN110346308B (en
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徐贲
张艺馨
王东宁
赵春柳
常冉
楼俊
谢成宝
胡朋兵
张建锋
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China Jiliang University
China University of Metrology
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China University of Metrology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry

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  • Spectroscopy & Molecular Physics (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Health & Medical Sciences (AREA)
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Abstract

A kind of electronic speckle spectrometer of intermode interference disclosed by the invention, including polarization maintaining optical fibre, multimode fibre, monochromatic area array CCD and computer, enter multimode fibre after grating and travers or random point using light to be measured, multiple modes are inspired, optical field distribution, the i.e. superposition of speckle point are showed on fiber end face, speckle pattern is shown on computers after the processing of monochromatic area array CCD, the difference of speckle pattern is bigger, and dispersive power is stronger, and resolution ratio is higher；Polarization maintaining optical fibre is connected with multimode fibre, and multimode fibre is connected with area array CCD, and area array CCD is connected by USB interface with computer；It is an advantage of the current invention that high resolution, fast response time, at low cost, volume is smaller, is suitable for on-line real-time measuremen.

Description

A kind of electronic speckle spectrometer of intermode interference
Technical field
The invention belongs to spectrum measurement instruments fields, are related to a kind of electronic speckle spectrometer of intermode interference.
Background technique
Spectrum measurement instruments are widely used in fiber sensor measuring, in the field of optical measurements such as laser measurement.Tradition Spectrometer generally use prism or grating, for prism color dispersion-type spectrometer, the effective aperture of dispersive power and system is wide Degree is related with angle dispersive power, but the dispersive power of single prism is limited, it is often necessary to be realized by the way of prism group, this leads Cause spectrometer volume larger；For grating type spectrometer, resolution ratio is determined that slit is narrower by screen periods, resolution ratio It is higher, when slit is very narrow, it is desirable that detector sensitivity is very high, and cost is very high.
Micro spectrometer is an important branch in spectral instrument, research focus on the integrated of system and Micromation.It include grating and prism inside micro spectrometer, such as Publication No. CN105136293A, patent name is a kind of base In the MEMS micromirror micro spectrometer of transmission grating, although improving the resolution ratio of micro spectrometer, it is internal comprising more A prism, volume are still very big；In addition to grating and prism also include mechanical devices inside micro spectrometer, such as Publication No. CN103017904A, patent name is a kind of adjustable micro spectrometer of resolution ratio, although improving the spectrum of micro spectrometer Measuring resolution, devises the adjustable micro spectrometer of resolution ratio, but the mechanical part for including inside it, such as angle of wedge piece, circle The mechanical devices such as cylinder turntable generally require to calibrate, and service life is also very limited.There are still many defects for micro spectrometer, therefore A kind of smaller volume, fast response time, all -fiber high resolution spectrometer easy to operate, at low cost, high resolution is needed Realize the measurement of tested light.
Summary of the invention
It is at low cost the object of the present invention is to provide a kind of fast response time in order to solve above-mentioned the deficiencies in the prior art, body Product is smaller, the electronic speckle spectrometer for the intermode interference that measurement part is all made of optical fiber.Using femto-second laser more Micro-structure in fibre is inscribed on mode fiber fibre core, acquires speckle pattern using monochromatic area array CCD, the difference of speckle point is bigger, dispersion energy Power is stronger, and resolution ratio is higher.Suitable for on-line real-time measuremen, transmission loss is small and not by electromagnetic interference.
Technical solution of the invention is as follows:
A kind of electronic speckle spectrometer of intermode interference is by polarization maintaining optical fibre, multimode fibre, monochromatic area array CCD and calculates unit At wherein polarization maintaining optical fibre is connected with multimode fibre, and multimode fibre is connected with monochromatic area array CCD, and monochromatic area array CCD is connect by USB Mouth is connected with computer, and micro-structure in fibre is included inside multimode fibre fibre core；The production method of micro-structure is to be swashed with femtosecond in fibre It is 1 μm of -10 μ that light device, which inscribes the grating that width is 0.5 μm -4 μm and travers inside multimode fibre fibre core or inscribes size, M, number are the random point of 10-1000, and the distributed areas length of random point is 5 μm of -5mm；The length of polarization maintaining optical fibre is 1m-5m, The length of multimode fibre is 1mm-5mm, and outer diameter is 125 μm, and internal diameter is 105 μm, is tested optical wavelength range in 400nm-3000nm.
The beneficial effects of the present invention are:
1. volume is smaller, cost is very low, using the measurement structure of all -fiber, using femto-second laser in multimode fibre fibre Core inner inscribes grating and travers or inscribes random point.
2. measurement structure is inside the fibre core of optical fiber, rather than it is strong not destroy mechanical fiber optic in fiber end face, production Degree, without carrying out fiber optical corrosive or punching, is hardly damaged.
3. high-resolution, micro-structure can inspire multiple modes in the fibre in multimode fibre, strong to wavelength sensitivity, point Resolution can achieve pm magnitude.
Detailed description of the invention
Fig. 1 is the electronic speckle spectrometer architecture schematic diagram of intermode interference.
Fig. 2 is the schematic diagram of grating and travers.
Fig. 3 is the schematic diagram of random point.
Fig. 4 is the speckle pattern of monochromatic area array CCD acquisition.
Fig. 5 is the complex light spectrum of measurement.
Fig. 6 show the complex light spectrum of measurement
Primary symbols are described as follows:
1- polarization maintaining optical fibre；2- multimode fibre；3- monochrome area array CCD；4- computer；
Specific embodiment
The present invention is further described below in conjunction with attached drawing.
Shown in Figure 1, a kind of electronic speckle spectrometer of intermode interference is by polarization maintaining optical fibre 1, multimode fibre 2, monochromatic face Battle array CCD3 and computer 4 form, and polarization maintaining optical fibre 1 is connected with multimode fibre 2, and multimode fibre 2 is connected with area array CCD 3, computer 4 Pass through USB interface and area array CCD 3.
The multimode fibre 2 of the electronic speckle spectrometer of intermode interference inscribes micro- knot in fibre inside fibre core with femto-second laser Structure, the production method of micro-structure is to remove one section of 2 coat of multimode fibre in fibre, is horizontally arranged and is placed on micro-displacement platform On, femtosecond laser focuses on fibre core, and appropriate laser energy is arranged, inscribed on fibre core grating and travers or inscribe with Machine point, above-mentioned 1 length of polarization maintaining optical fibre are 1m-5m, and above-mentioned 2 length of multimode fibre is 1mm-5mm, and outer diameter is 125 μm, internal diameter It is 105 μm, the distributed areas length of above-mentioned random point is 5 μm of -5mm.
Fig. 2 show the schematic diagram of grating and travers, in the example shown in figure 2, inside the fibre core of multimode fibre 2 The grating and travers that width is 0.5 μm -4 μm are inscribed using femto-second laser.
Fig. 3 show the schematic diagram of random point, in examples as shown in figure 3, femtosecond is used inside the fibre core of multimode fibre 2 It is 1 μm -10 μm that laser, which inscribes size, and number is the random point of 10-1000.
Fig. 4 show the speckle pattern that monochromatic area array CCD 3 acquires, and in the example shown in fig. 4,2 length of multimode fibre is 2mm, the distributed areas length of random point are 400 μm, and the number of random point is 700.
Fig. 5 show the complex light spectrum of measurement, and in example shown in Fig. 5, incident light is the identical unicast of 5 intensity Long light source obtains the spectrum of complex light by algorithm inverting, and demonstrating this spectrometer may be implemented the spectral measurement of complex light.
Fig. 6 show the complex light spectrum of measurement, and in example shown in Fig. 6, incident light is 2 intensity identical central waves The single wavelength light source of long difference 10pm, obtains the spectrum of complex light by algorithm inverting, and demonstrating this spectrometer resolution ratio can be with Reach pm magnitude.
The working-flow: light enters multimode fibre 2 after grating and travers or random point, inspires multiple Mode, shows optical field distribution, the i.e. superposition of speckle point on fiber end face, and the photosensitive element of monochromatic area array CCD 3 receives multimode It is transformed into charge after the light of 2 end face of optical fiber, digital signal is converted by analog-digital converter, digital signal is after overcompression It is transferred in computer 4 by USB interface and saves and show speckle pattern by computer 4.When incident light is monochromatic light When, the wavelength of incident light is υ1, obtained speckle pattern is S1, a length of υ of incident light wave2, speckle pattern S2, and so on, work as input The a length of υ of light wavenWhen, speckle pattern Sn, each speckle pattern, speckle pattern S are imported by matlab1It can regard as a matrix M1, And so on, speckle pattern SnSee matrix M asn.If incident light is complex light, the matrix of available speckle pattern is AM1+BM2 +……+NMn(strength component that A, B ... N are each wavelength) can be regarded as multiple monochromatic light and correspond to the folded of speckle pattern intensity Add, obtains the spectrum of complex light by algorithm process inverting.

Claims (7)

1. a kind of electronic speckle spectrometer of intermode interference, including polarization maintaining optical fibre, multimode fibre, monochromatic area array CCD and computer, The polarization maintaining optical fibre is connected with the multimode fibre, and the multimode fibre is connected with the monochromatic area array CCD, described Monochromatic area array CCD be connected with the computer by the USB interface；It is characterized in that in the multimode fibre fibre core Portion includes micro-structure in fibre.
2. the electronic speckle spectrometer of a kind of intermode interference according to claim 1, it is characterized in that micro- knot in the fibre Structure is that width is 0.5 μm -4 μm of grating and travers, is divided into 10 μm -20 μm.
3. the electronic speckle spectrometer of a kind of intermode interference according to claim 1, it is characterized in that micro- knot in the fibre Structure is the random point that size is 1 μm -10 μm and number is 10-1000.
4. the electronic speckle spectrometer of a kind of intermode interference according to claim 1, it is characterized in that the polarization maintaining optical fibre Length is 1m-5m.
5. the electronic speckle spectrometer of a kind of intermode interference according to claim 1, it is characterized in that the multimode fibre Length is 1mm-5mm, and outer diameter is 125 μm, and internal diameter is 105 μm.
6. the electronic speckle spectrometer of a kind of intermode interference according to claim 1, it is characterized in that tested optical wavelength range In 400nm-2000nm.
7. a kind of electronic speckle spectrometer of intermode interference according to claim 1, it is characterized in that the random point Distributed areas length is 5 μm of -5mm.
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CN115615921A (en) * 2022-10-13 2023-01-17 哈尔滨工程大学 Compact all-fiber speckle spectrometer based on microstructure multimode fiber

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CN201434918Y (en) * 2009-07-17 2010-03-31 无锡光芯科技有限公司 Optical fiber grating device
WO2013188520A2 (en) * 2012-06-12 2013-12-19 Yale University Multimode optical fiber spectrometer
CN102830464A (en) * 2012-09-05 2012-12-19 哈尔滨工程大学 Double-filtering microstructure beam splitter based on single mode-multimode fiber bragg grating
CN103528608A (en) * 2013-10-30 2014-01-22 陕西高新实业有限公司 Multimode optical fiber speckle sensing system based on charge coupled device (CCD) partition positioning
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