CN109000795A - A kind of pulse laser spectral temporal resolution and measurement system and measurement method - Google Patents
A kind of pulse laser spectral temporal resolution and measurement system and measurement method Download PDFInfo
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- CN109000795A CN109000795A CN201810663088.3A CN201810663088A CN109000795A CN 109000795 A CN109000795 A CN 109000795A CN 201810663088 A CN201810663088 A CN 201810663088A CN 109000795 A CN109000795 A CN 109000795A
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- 238000005259 measurement Methods 0.000 title claims abstract description 23
- 238000000691 measurement method Methods 0.000 title claims description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 239000013307 optical fiber Substances 0.000 claims abstract description 27
- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 239000006185 dispersion Substances 0.000 claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000001228 spectrum Methods 0.000 claims description 17
- 230000005611 electricity Effects 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 10
- 210000001367 artery Anatomy 0.000 claims description 4
- 210000003462 vein Anatomy 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
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- 238000000411 transmission spectrum Methods 0.000 abstract 1
- 241000931526 Acer campestre Species 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2889—Rapid scan spectrometers; Time resolved spectrometry
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Abstract
The invention discloses a kind of pulse laser spectral temporal resolution and measurement system and method, measuring system includes isochronous controller, dispersion light splitting optical path, fiber array receiver, photovoltaic array reception conversion module and multi-channel data acquisition module；Isochronous controller is connect with pulsed laser light source and multi-channel data acquisition module；Dispersion light splitting optical path exports the laser pulse signal of multiple wavelength, the laser pulse signal of multiple wavelength is transmitted to photovoltaic array through the optical fiber of one-to-one multiple equal lengths and receives conversion module, and the laser pulse signal that corresponding receiving end exports is carried out photoelectric conversion and forms multiple electrical pulses signals by each photoelectric detection unit；Multiple electrical pulses signals acquire through multi-channel data acquisition module and carry out A/D conversion and storage.The present invention solves the problems, such as that transmission spectra instrument is unable to measure to obtain spectral temporal information, can analyze for spectral characteristics of radiation and laser emission kinetic Process Analysis provides help.
Description
Technical field
The present invention relates to laser spectrum fields of measurement, and in particular to a kind of pulse laser spectral temporal resolution and measurement system and
Measurement method.
Background technique
Conventional spectrograph spectral response wave band is visible light to near-infrared, can measure to obtain laser spectrum distribution.At certain
In a little special applications, it is also necessary to time discrimination measurement is carried out to spectrum, for analyzing laser dynamics process, normal light
Spectrometer is unable to satisfy measurement demand, it is therefore desirable to build measuring system, complete the time discrimination measurement of laser spectrum.
Summary of the invention
In order to solve the technical issues of existing conventional spectrograph can not carry out time discrimination measurement to spectrum, the present invention is provided
A kind of pulse laser spectral temporal resolution and measurement system and measurement method.
Technical solution of the invention is as follows:
Pulse laser spectral temporal resolution and measurement system of the invention, is characterized in that
Including isochronous controller 10, dispersion light splitting optical path, fiber array receiver 4, photovoltaic array receive conversion module 6,
The transmission cable 7 and multi-channel data acquisition module 8 of multiple equal lengths；
The fiber array receiver 4 includes the optical fiber 5 of multiple equal lengths；The photovoltaic array receives conversion module 6 and wraps
It includes and the one-to-one multiple photoelectric detection units of the optical fiber 5 of multiple equal lengths；
The isochronous controller 10 is connect with pulsed laser light source 1 and multi-channel data acquisition module 8；
The dispersion light splitting optical path is arranged on the emitting light path of pulsed laser light source 1, exports the laser arteries and veins of multiple wavelength
Rush signal；
The laser pulse signal of multiple wavelength is transmitted to one-to-one more through the optical fiber 5 of one-to-one multiple equal lengths
The laser pulse signal of input is carried out photoelectric conversion and forms multiple electricity arteries and veins by a photoelectric detection unit, multiple photoelectric detection units
Rush signal；
Multiple electrical pulses signals are passed to multi-channel data acquisition mould through the transmission cable 7 of one-to-one multiple equal lengths
Block 8 acquires, and multi-channel data acquisition module 8 carries out A/D conversion to multiple electrical pulses signals and stores.
Further, pulse laser spectral temporal resolution and measurement system of the invention further includes and multi-channel data acquisition mould
The PC machine 9 that block 8 connects.PC machine 9 is used to complete the data storage and display of 8 up-delivering signal of multi-channel data acquisition module.
Further, pulse laser spectral temporal resolution and measurement system of the invention further includes condenser lens 2, the focusing
Lens 2 setting pulsed laser light source 1 outlet dispersion light splitting optical path entrance between, by the light of pulsed laser light source 1 collect into
Enter dispersion light splitting optical path.
Further, for light gathering ability, the fiber array receiver 4 of the invention further includes stationary fixture 43
And the one-to-one collecting lens 41 of optical fiber 5 with multiple equal lengths, the setting of collecting lens 41 is in corresponding optical fiber 5 and spectrum mark
Between ruler 35, the fiber end face 42 of optical fiber 5 is in 41 focal point of collecting lens, the optical fiber 5 and collecting lens 41 of multiple equal lengths
Rely on the installation positioning of stationary fixture 43.
Further, the dispersion light splitting optical path includes the entrance slit being successively set on 2 emitting light path of condenser lens
31, reflecting mirror I 32, grating 33, reflecting mirror II 34 and spectrum scale 35.
Further, 2 material of condenser lens is CaF2, it is convex lens, focal length of lens 1m.
Further, the light splitting ability of the dispersion light splitting optical path is 1nm/mm.
Meanwhile the present invention also provides a kind of pulse laser spectral temporal resolved measurement method, it is characterized in that
1) isochronous controller 10 generates two path control signal, and read signal is for controlling multi-channel data acquisition module all the way
8, another way Trg signal goes out light for controlling pulsed laser light source 1, and the two path control signal time difference is △ t, t > 0 △；
2) emergent light of pulsed laser light source 1 enters dispersion light splitting optical path and is divided, and generates the laser arteries and veins of multiple wavelength
Rush signal；
3) laser pulse signal of multiple wavelength enters photovoltaic array by the conduction of optical fiber 5 of one-to-one multiple equal lengths
Receive conversion module 6；
4) photovoltaic array receives conversion module 6 and carries out photoelectric conversion to the laser pulse signal of multiple wavelength, is formed multiple
Electrical pulses signal；
5) multiple electrical pulses signals are transferred into multichannel data through the transmission cable 7 of one-to-one multiple equal lengths and adopt
Collect module, Multichannel data acquisition module carries out the corresponding electricity number for generating multiple channels of A/D conversion to multiple electrical pulses signals
Word signal records and stores time and the amplitude information of the electricity digital signal in multiple channels；
6) temporal information of the electricity digital signal in same channel is analyzed, obtains wavelength corresponding with the channel
It the formation time of laser pulse and holds time；
The temporal information of the electricity digital signal in different channels is compared, the time of different wave length laser pulse is obtained
It differentiates.
It further, is the integrality for each channel signal for ensuring to record, multi-channel data acquisition module 8 is adopted in step 5)
A length of t when collectionread, tread=△ t+2 × tpulse, wherein tpulseFor laser pulse width.
Further, the acquisition rate that subchannel acquires in step 5) is according to most short in the laser pulse signal of multiple wavelength
Depending on laser pulse width.
Compared with prior art, the present invention beneficial effect is:
1, by carrying out dispersion light splitting to pulse laser, transmission, A/D conversion, is stored and is analyzed photoelectric conversion the present invention,
The time difference of different wave length spectral line in laser spectrum can be provided to pulse laser spectral temporal resolved measurement.
2, using the present invention to the time discrimination measurement of laser spectrum, can analyze the outgoing time of different optical maser wavelengths with
And the wavelength radiation is held time, and then laser dynamics process-related information of analyzing and researching.
Detailed description of the invention
Fig. 1 is measuring system schematic illustration of the present invention；
Fig. 2 is infrared pulse HF laser radiation spectral temporal resolved measurement schematic device in the embodiment of the present invention；
Fig. 3 is the matching chart of spectrum scale and fiber array receiver；
Fig. 4 is laser trigger signal of embodiment of the present invention Trg, multi-channel data acquisition module control signal read and multiple
The timing diagram of wavelength laser pulse signal；
Wherein, appended drawing reference are as follows: 1- pulsed laser light source；2- condenser lens；3- shell；31- entrance slit, 32- reflection
Mirror I；34- reflecting mirror II；33- grating, 35- spectrum scale, 4- fiber array receiver, 41- collecting lens, 42- fiber end face,
43- stationary fixture, 5- optical fiber, 6- photovoltaic array receive conversion module, 7- transmission cable, 8- multi-channel data acquisition module, 9-
PC machine, 10- isochronous controller.
Specific embodiment
A preferred embodiment of the present invention is described in detail below in conjunction with attached drawing.
In the present embodiment, pulsed laser light source 1 is the middle infrared pulse HF laser that feature is exported with multi-wavelength.
As shown in Figs. 1-2, pulse laser spectral temporal resolution and measurement system of the invention, including condenser lens 2, dispersion point
Light optical path, fiber array receiver 4, photovoltaic array receive conversion module 6, more transmission cables 7, multi-channel data acquisition module
8, PC machine 9 and isochronous controller 10.
Middle infrared pulse swashs HF light device and works in external trigger mode, and laser has external trigger control function.Condenser lens 2
Setting receives the light of middle pulsed infrared laser light source between the outlet of middle pulsed infrared laser light source and dispersion light splitting optical path entrance
Collection enters dispersion light splitting optical path.Dispersion light splitting optical path has the function of dispersion, and calibrates wavelength location, dispersion in optical line terminal
Light splitting optical path is located in shell 3.Dispersion light splitting optical path includes the entrance slit being successively set on 2 emitting light path of condenser lens
31, reflecting mirror I 32, grating 33, reflecting mirror II 34 and the spectrum scale 35 for calibrating optic spectrum line position.
As shown in figure 3, fiber array receiver 4 of the invention include stationary fixture 43, multiple equal lengths optical fiber 5 and with
The one-to-one collecting lens 41 of optical fiber 5 of multiple equal lengths, the setting of collecting lens 41 is in corresponding optical fiber 5 and spectrum scale 35
Between, for collecting the optical signal of specific wavelength λ i (i=1~n)；The fiber end face 42 of optical fiber 5 is in 41 focus of collecting lens
Place, converged light is transmitted with optical fiber.The optical fiber 5 and collecting lens 41 of multiple equal lengths rely on the installation positioning of stationary fixture 43,
And it is assemblied in specific position corresponding with spectrum scale λ i (i=1~n), laser signal is collected and is passed by optical fiber 5
It leads.
Photovoltaic array, which receives in conversion module 6, multiple photoelectric detection units, multiple probe unit linear arrays, number with
HF optical maser wavelength data are corresponding, each photoelectric detection unit has faster time response, complete to per 100ns pulse all the way
The photoelectric conversion of laser pulse signal.Multi-channel data acquisition module 8 has external trigger function and multiple data acquisition channels, often
A acquisition channel is corresponding with a photoelectric detection unit in fiber array receiver 4, and data acquisition module has high speed number
It is depending on acquisition rate foundation most short laser pulse width and matched according to acquisition function, it can be turned with the A/D of complete pair signals
It changes function and is uploaded to PC machine 9.In embodiment, the acquisition rate of multi-channel data acquisition module 8 is not less than 100MHz, can
Undistorted acquisition to 100ns laser pulse signal.Multi-channel data acquisition module 8 has external trigger function.The completion pair of PC machine 9
The data of 8 up-delivering signal of multi-channel data acquisition module store and display.2 material of condenser lens is CaF2, it is convex lens, lens
Focal length is 1m；Isochronous controller 10 has the output of two-way TTL signal, and can control the delay time △ t of two paths of signals, so that
Between data acquisition module start recording time advance is when laser goes out light, it is ensured that the multiwavelength laser signal after light splitting reaches
Before multi-channel data acquisition module 8, data acquisition module has begun each channel signal data of synchronous recording.
Middle pulsed infrared laser spectral temporal resolved measurement method proposed by the present invention, comprising the following steps:
1) isochronous controller 10 generates two path control signal, and read signal is for controlling multi-channel data acquisition module all the way
8, another way Trg signal goes out light, two path control signal time difference △ t (t > 0 △) for controlling pulsed HF laser.Read signal
It is as shown in Figure 4 with the waveform diagram of Trg signal.
2) emergent light of pulsed laser light source enters dispersion light splitting optical path and is divided, and generates the laser pulse of multiple wavelength
Signal；
3) laser pulse signal of multiple wavelength enters photovoltaic array by the conduction of optical fiber 5 of one-to-one multiple equal lengths
Receive conversion module 6；
4) photovoltaic array receives conversion module 6 and carries out photoelectric conversion to the laser pulse signal of multiple wavelength, is formed multiple
Electrical pulses signal；
5) multiple electrical pulses signals are transferred into multichannel data through the transmission cable 7 of one-to-one multiple equal lengths and adopt
Collect module, Multichannel data acquisition module carries out the corresponding electricity number for generating multiple channels of A/D conversion to multiple electrical pulses signals
Word signal records and stores time and the amplitude information of the electricity digital signal in multiple channels, as shown in Figure 4；
6) temporal information of the electricity digital signal in same channel is analyzed, obtains wavelength corresponding with the channel
It the formation time of laser pulse and holds time；
The temporal information of the electricity digital signal in different channels is compared, the time of different wave length laser pulse is obtained
It differentiates.
In the present invention, multi-channel data acquisition module 8 acquires duration treadIt is controlled by the high level of read signal, read
Signal terminates at laser single and goes out after light terminates, can be taken as 2 times of laser pulse widths in advance in Trg signal, it may be assumed that
tread=△ t+2 × tpulse, wherein tpulseFor laser pulse width, with the integrality for each channel signal for ensuring to record.
Claims (9)
1. a kind of pulse laser spectral temporal resolution and measurement system, it is characterised in that:
Conversion module is received including isochronous controller (10), dispersion light splitting optical path, fiber array receiver (4), photovoltaic array
(6), the transmission cable (7) and multi-channel data acquisition module (8) of multiple equal lengths；
The fiber array receiver (4) includes the optical fiber (5) of multiple equal lengths；The photovoltaic array receives conversion module (6)
Including the one-to-one multiple photoelectric detection units of optical fiber (5) with multiple equal lengths；
The isochronous controller (10) connect with pulsed laser light source (1) and multi-channel data acquisition module (8)；
The dispersion light splitting optical path is arranged on the emitting light path of pulsed laser light source (1), exports the laser pulse of multiple wavelength
Signal；
The laser pulse signal of multiple wavelength is transmitted to one-to-one multiple through the optical fiber (5) of one-to-one multiple equal lengths
The laser pulse signal of input is carried out photoelectric conversion and forms multiple electrical pulses by photoelectric detection unit, multiple photoelectric detection units
Signal；
Multiple electrical pulses signals are passed to multi-channel data acquisition module through the transmission cable (7) of one-to-one multiple equal lengths
(8) it acquires, multi-channel data acquisition module (8) carries out A/D conversion to multiple electrical pulses signals and stores.
2. pulse laser spectral temporal resolution and measurement system according to claim 1, it is characterised in that:
It further include the PC machine (9) being connect with multi-channel data acquisition module (8).
3. pulse laser spectral temporal resolution and measurement system according to claim 2, it is characterised in that:
It further include condenser lens (2), condenser lens (2) setting is in pulsed laser light source (1) outlet and dispersion light splitting optical path
Between entrance.
4. pulse laser spectral temporal resolution and measurement system according to claim 3, it is characterised in that:
The dispersion light splitting optical path includes entrance slit (31), the reflecting mirror I being successively set on condenser lens (2) emitting light path
(32), grating (33), reflecting mirror II (34) and spectrum scale (35).
5. pulse laser spectral temporal resolution and measurement system according to claim 3 or 4, it is characterised in that:
The fiber array receiver (4) further includes stationary fixture (43) and one-to-one with the optical fiber (5) of multiple equal lengths
Collecting lens (41), collecting lens (41) are arranged between corresponding optical fiber (5) and spectrum scale (35), the optical fiber of optical fiber (5)
End face (42) is in collecting lens (41) focal point, and the optical fiber (5) and collecting lens (41) of multiple equal lengths rely on fixing clamp
Has (43) installation positioning.
6. pulse laser spectral temporal resolution and measurement system according to claim 5, it is characterised in that:
Condenser lens (2) material is CaF2, it is convex lens, focal length of lens 1m.
7. a kind of pulse laser spectral temporal resolved measurement method, it is characterised in that:
1) isochronous controller (10) generates two path control signal, and read signal is for controlling multi-channel data acquisition module all the way
(8), another way Trg signal goes out light for controlling pulsed laser light source (1), and the two path control signal time difference is △ t, t > 0 △；
2) emergent light of pulsed laser light source (1) enters dispersion light splitting optical path and is divided, and generates the laser pulse of multiple wavelength
Signal；
3) laser pulse signal of multiple wavelength is conducted into photovoltaic array by the optical fiber (5) of one-to-one multiple equal lengths and is connect
It receives conversion module (6)；
4) photovoltaic array receives conversion module (6) and carries out photoelectric conversion to the laser pulse signal of multiple wavelength, forms multiple electricity
Learn pulse signal；
5) multiple electrical pulses signals are transferred into multi-channel data acquisition through the transmission cable (7) of one-to-one multiple equal lengths
Module (8), Multichannel data acquisition module (8) carry out the corresponding electricity for generating multiple channels of A/D conversion to multiple electrical pulses signals
Digital signal is learned, time and the amplitude information of the electricity digital signal in multiple channels are recorded and stored；
6) temporal information of the electricity digital signal in same channel is analyzed, obtains the laser of wavelength corresponding with the channel
It the formation time of pulse and holds time；
The temporal information of the electricity digital signal in different channels is compared, the time point of different wave length laser pulse is obtained
It distinguishes.
8. pulse laser spectral temporal resolved measurement method according to claim 7, it is characterised in that:
A length of t when multi-channel data acquisition module (8) acquires in step 5)read, tread=△ t+2 × tpulse, wherein tpulseFor
Laser pulse width.
9. pulse laser spectral temporal resolved measurement method according to claim 7 or 8, it is characterised in that:
The acquisition rate of Multichannel data acquisition module is according to laser arteries and veins most short in the laser pulse signal of multiple wavelength in step 5)
It rushes depending on width.
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