CN100593710C - Multicenter parallel measuring system for light ball modulation type reflection difference spectrograph - Google Patents
Multicenter parallel measuring system for light ball modulation type reflection difference spectrograph Download PDFInfo
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- CN100593710C CN100593710C CN200710059903A CN200710059903A CN100593710C CN 100593710 C CN100593710 C CN 100593710C CN 200710059903 A CN200710059903 A CN 200710059903A CN 200710059903 A CN200710059903 A CN 200710059903A CN 100593710 C CN100593710 C CN 100593710C
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Abstract
The invention belongs to the technical field of spectral technique and instruments in the field of surface detection, in particular to a multichannel parallel measuring system for reflectance difference spectrometers based on photoelastic modulation. The invention provides a multichannel parallel measuring system for reflectance difference spectrometers based on photoelastic modulation, and has multiple wavelength simultaneous measurement function, simple structure; is used reliably and conveniently, and has high expansibility. The invention adopts the following technical proposal to achieve the functions: the multichannel parallel measuring system comprises a fast fourier transformation module and a lock-in amplifier module. The sampled signal and the reference signal output by a data acquisition card are output to the fast fourier transformation module and the lock-in amplifier module for processing. The invention is primarily used for surface detection.
Description
Technical field
The invention belongs to the spectral technique and the Instrument technology field of surperficial detection range, particularly a kind of multicenter parallel measuring system for light ball modulation type reflection difference spectrograph.
Technical background
The reflection difference spectral technique has highly sensitive optical measurement means as a kind of optical anisotropy attribute to body surface/interface, in micro-foundation scientific research fields such as semiconductor material surface attributive analysis, metal surface research, organic/inorganic films, with detecting with semiconductor machining and liquid crystal panel is the hi-tech production field of representative, the application of all having succeedd.It surveys the light variation of sample surfaces reflection front and back polarization state after tested by measuring, perception changes because of the surface structure that factors such as chemical reaction, absorption, reorganization cause, and sample top layer information can be separated with the body internal information, have characteristics such as non-cpntact measurement, the test environment requirement is low, apparatus structure is simple.
Photoelastic modulation type reflection difference spectrograph is as the instrument based on second generation reflection difference spectral technique, owing to adopt light ball modulator modulation information measured, at aspects such as measuring accuracy, stability and speed significant progress has been arranged, improved the ability of this technology on-line real time monitoring under single wavelength measurement pattern.Yet the modulating frequency of light ball modulator is by the natural frequency decision of photoelastic crystal, and generally near 50kHz, higher modulating frequency requirement system adopts higher sample frequency, guarantees the normal use of fast fourier transformation algorithm in the data processing.Therefore, traditional instrument adopts the device of hardware lock-in amplifier as the signal demodulation, extracts the signal message under modulating frequency and the frequency multiplication thereof, and this has limited traditional instrument and has once only measured a signal under the wavelength.On the other hand, need analyze the signal of a plurality of wavelength or broad spectrum to the optically anisotropic measurement in surface, but not the signal of certain wavelength, so traditional instrument usually adopts and sweeps the spectrum mode and realize full spectral measurement to sample, this mode makes that the Measuring Time of full spectral information is longer, causes the spectrometer can't be to sample surfaces characteristic real-time testing.
Improved photoelastic modulation type reflection difference spectrograph has adopted a plurality of hardware lock-in amplifiers, and each amplifier is gathered the signal under the wavelength, can realize the multi-channel parallel measurement.But it is the defective of this improvement project that instrument cost height, complex structure, net synchronization capability require height and parallel measurement number of channels limited etc., has restricted the expansion of this technical applications.
Summary of the invention
For overcoming the deficiencies in the prior art, the objective of the invention is to: a kind of photoelastic modulation type reflection difference spectrograph multi-channel parallel measuring method and device are provided.This method has been inherited the advantage that photoelastic modulation type reflection difference spectrograph is measured fast, has developed multi-wavelength measurement function simultaneously again, employing simple in structure, and it is reliably convenient to use, favorable expandability.
In order to achieve the above object, the technical solution used in the present invention is:
Multicenter parallel measuring system for light ball modulation type reflection difference spectrograph, comprise: the hyperchannel detector of Xiang Lianing, hyperchannel selector switch, data collecting card, computing machine successively, the control end of hyperchannel selector switch, data collecting card links to each other with computing machine respectively, computing machine comprises: bandpass filter, FFT conversion module, bandpass filter links to each other with the FFT conversion module, and bandpass filter and FFT conversion module are formed the fast fourier transform module; Computing machine also comprises the lock-in amplifier module, constituting of lock-in amplifier module: the wave filter of Xiang Lianing, detuner, low-pass filter successively, the lock-in amplifier module also is provided with the PLL algorithm demodulation of phase locking module that links to each other with detuner, the sampled signal of aforementioned data capture card output outputs to bandpass filter filter and wave filter respectively, reference signal outputs to the FFT conversion module, and reference signal also outputs to PLL algorithm demodulation of phase locking module.
Wherein, each passage of hyperchannel detector output port and the corresponding connection of each of hyperchannel selector switch inlet, the outlet of hyperchannel selector switch then links to each other with the collection port of data collecting card.
The hyperchannel detector is made of holographic grating, silicon photo diode array.
The present invention possesses following technique effect:
One, employing industry member hyperchannel high-performance widespread use, standard high-speed figure capture card substitutes the lock-in amplifier array in the traditional instrument structure, simplified the complexity that instrument hardware connects, effectively dwindled the instrument volume, reduce instrument cost, had advantages such as assembling is easy, combination is flexible, movability is strong.
Two, adopt the hyperchannel selector switch, can measure single arbitrarily passage or combination of channels on the detector.The quantity of instrument parallel acquisition passage and acquisition precision depend primarily on the performance of hyperchannel selector switch and data collecting card.
Three, data analysis function is transferred on the computing machine from the lock-in amplifier of hardware, made full use of the calculated performance of computing machine excellence and the randomness and the diversity of data processing, be convenient to system upgrade and renewal.Adopt virtual instrument technique to combine, saved the panel type structure of traditional instrument with data collecting card, hyperchannel selector switch.Software based on virtual technology not only can be transplanted in other computing machines or the operating system in seamless unoccupied place, has also reduced the risk of system update, and promptly software or hardware can upgrade independently of each other.
Four, adopt fast fourier transform module and lock-in amplifier module core algorithm, promptly satisfied the demand of data processing, inherited the advantage of hardware lock-in amplifier high measurement accuracy again as signal Processing.
Description of drawings
Fig. 1: multi-channel parallel measuring light spectrometer data Collection ﹠ Processing System synoptic diagram.
Fig. 2: data analysis process flow diagram.1 is the fast fourier transform module among the figure, and 2 is the lock-in amplifier module.
Embodiment
The present invention is described further below in conjunction with accompanying drawing.
Fig. 1 is the synoptic diagram of multi-channel parallel measuring light spectrometer data acquisition and processing (DAP) system.Have light intensity signal metrical information, that modulate through light ball modulator and at first shine on the hyperchannel detector that includes light-dividing device, as holographic grating+silicon photo diode array.Detector is transformed into analog voltage signal in real time with light intensity, and is transferred to output port.Each passage of output port and the corresponding connection of each of hyperchannel selector switch inlet, the outlet of hyperchannel selector switch then is connected one by one with the collection port of data collecting card, and the instruction of sending according to computing machine, the passage conducting that need are measured is to output terminal, for the data collecting card collection.Data collecting card assigns into the computer motherboard slot or is connected with computing machine by USB, and it becomes digital signal with the analog signal conversion that the hyperchannel selector switch transmits, and is sent to calculator memory in real time, treats subsequent treatment.Simultaneously, a passage of capture card connects the frequency modulation reference signal of light ball modulator output, and guarantees the synchronous acquisition of reference signal and test signal.Computing machine sends the channel selecting of Instruction Selection suitable data capture card running parameter and hyperchannel selector switch according to operating personnel's intention.
The data transmission of gathering when capture card arrives computing machine, and fast fourier transform module and lock-in amplifier module are carried out the frequency spectrum analysis to data, shown in Fig. 2 data analysis process flow diagram.Sampled signal and reference signal are sent to two analysis modules respectively and handle.In the fast fourier transform module, the noise signal of sampled signal process bandpass filter filtering earlier and reference frequency apart from each other, again sampled signal and reference signal are carried out the FFT conversion simultaneously, amplitude-frequency graph of a relation according to reference signal is determined real-time modulating frequency, and the amplitude and the DC component of extraction same frequency and double frequency down-sampled signal correspondence, i.e. S1, S2, S0.
In the lock-in amplifier module, sampled signal is at first passed through filter filtering, reference signal is then carried out PLL algorithm process (demodulation of phase locking algorithm), in the hope of fundamental frequency reference signal ideally, signal after two processing is transferred to detuner simultaneously, by multiplication process and low-pass filter subsequently, extract the amplitude S1 under the measuring-signal fundamental frequency.In like manner, the PLL algorithm also can produce desirable double frequency reference signal according to reference signal, again through the amplitude S2 under detuner and low-pass filter acquisition measuring-signal two frequencys multiplication.Sampled signal is averaged the DC component S0 that can obtain measuring-signal with low-pass filtering.From S0, S1, S2, can solve the reflection difference signal of sample.
Data processing in the computing machine, man-machine interaction, and data acquisition instruction and all be to form by LabVIEW software programming based on virtual technology to the steering order of capture card and hyperchannel selector switch.The multi-channel data that data collecting card is gathered simultaneously is transferred to computing machine with the form of matrix, and each data processing module is then handled the data of different passages simultaneously with the matrix operation form, thereby can once obtain the reflection difference signal of a plurality of passages.
Data collecting card and hyperchannel selector switch can be changed according to actual needs, with the optimal balance point of obtained performance and cost.The replacing of hardware will not influence the work of software, also can increase or change processing module in software, and to improve arithmetic speed and analysis precision, same, the upgrading of software will not influence the work of hardware.
Claims (2)
1, a kind of multicenter parallel measuring system for light ball modulation type reflection difference spectrograph, it is characterized in that, comprise: the hyperchannel detector of Xiang Lianing successively, the hyperchannel selector switch, data collecting card and computing machine, wherein, the hyperchannel selector switch, the control end of data collecting card links to each other with computing machine respectively, computing machine comprises bandpass filter, fft algorithm module and lock-in amplifier module, described bandpass filter links to each other with the fft algorithm module, described bandpass filter and fft algorithm module are formed the fast fourier transform module, described lock-in amplifier module comprises the wave filter that links to each other successively, detuner and low-pass filter, lock-in amplifier module also are provided with the PLL algorithm demodulation of phase locking module that links to each other with detuner; Having light intensity signal metrical information, that modulate through light ball modulator shines on the described hyperchannel detector that includes light-dividing device, each passage of described hyperchannel detector output port and the corresponding connection of each of described hyperchannel selector switch inlet, the outlet of hyperchannel selector switch then links to each other with the collection port of described data collecting card, and a passage of described data collecting card connects the frequency modulation reference signal of light ball modulator output, and guarantees the synchronous acquisition of frequency modulation reference signal and test signal; The sampled signal of described data collecting card output outputs to described bandpass filter in the fast fourier transform module and the described wave filter in the lock-in amplifier module respectively, and the frequency modulation reference signal of described data collecting card output outputs to described fft algorithm module and PLL algorithm demodulation of phase locking module respectively.
2, a kind of multicenter parallel measuring system for light ball modulation type reflection difference spectrograph according to claim 1 is characterized in that, described hyperchannel detector is made of holographic grating and silicon photo diode array.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101321015B (en) * | 2008-06-20 | 2011-02-09 | 中国科学院上海光学精密机械研究所 | Full-digital pulse position modulation signal receiver and receiving method |
| BR112012017260A2 (en) * | 2010-02-12 | 2017-10-03 | Advanced Fusion Systems Llc | METHOD AND SYSTEM TO DETECT MATERIALS" |
| CN102495027B (en) * | 2011-12-05 | 2014-07-02 | 天津大学 | Method and device for measuring optical parameter of chaotic medium by multi-wavelength space resolution phase lock |
| CN104048948B (en) * | 2014-03-20 | 2016-08-17 | 中国科学院物理研究所 | A kind of femtosecond time resolution phase-locked XRF of multiple tracks based on optically erasing |
| CN105548073B (en) * | 2015-12-24 | 2018-07-10 | 中国科学院合肥物质科学研究院 | A kind of simple demodulation method applied to the detection of wavelength modulated optical absorption spectra |
| CN109060660A (en) * | 2018-08-08 | 2018-12-21 | 天津大学 | Reflection difference optical measuring system and method based on LC variable delayer |
| CN110031101A (en) * | 2019-05-07 | 2019-07-19 | 成都以太航空保障工程技术有限责任公司 | A kind of multichannel cascade connection UV fiber spectrometer |
| CN110793942B (en) * | 2019-10-12 | 2022-02-08 | 天津大学 | Two-dimensional material morphology rapid characterization system and method based on color camera |
| CN115844325B (en) * | 2022-11-17 | 2024-10-18 | 天津大学 | Distributed fNIRS brain function imaging system for super-scanning application |
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