CN107084790A - Portable spectrometer and its spectral method of detection based on smart mobile phone - Google Patents
Portable spectrometer and its spectral method of detection based on smart mobile phone Download PDFInfo
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Abstract
The present invention relates to a kind of portable spectrometer based on smart mobile phone and its spectral method of detection, including smart mobile phone and the spectrometer peripheral module that is assemblied on smart mobile phone camera；Spectrometer peripheral module includes being used to collect the conduction optical fiber for treating light signal, carries out the optical alignment system that collimating and correcting obtains directional light for treating light signal, and for carrying out the optical dispersion system that dispersion light splitting forms the dispersion striped that wavelength is arranged in order to directional light；Smart mobile phone camera is used to dispersion striped shoot to obtain color fringe picture, and smart mobile phone camera is connected to draw the data processing module of the curve of spectrum, data processing module connection display module according to color fringe picture.The present invention is that spectra collection can be achieved with reference to spectrometer peripheral module, without individually power supply, can effectively be reduced system cost, reduction system volume is easy to use and carry using detector of the smart mobile phone camera as spectrometer.
Description
Technical field
The invention belongs to spectrum analysis field, and in particular to a kind of portable spectrometer and its spectrum based on smart mobile phone
Detection method.
Background technology
Spectrometer is the instrument for carrying out spectrum selective materials and substance spectra analysis.By the measurement to spectrum, complete light into
Analysis, materials optical property measurement and material composition identification, are a kind of basic optical detecting instruments.Conventional spectrometers by
In it is bulky, involve great expense, be generally only used for laboratory research.In the last few years, due to biomedical, science and technology agricultural, environment
The development in the fields such as detection, military analysis and health monitoring, it is desirable to which spectrometric instrument has lightweight, miniaturization, portable
The features such as change, from 2005, U.S.'s marine optics, Holland Ai Wantisi and China enjoyed optics etc. to start research and development portable again
Micro spectrometer.
At present, portable spectrometer prevailing price is higher, and market price is thousands of to tens of thousands of, and this is due to portable light
Spectrometer generally uses special CMOS or ccd sensor detecting light spectrum signal, such as based on CMOS of the developments of Sun little little in 2013
(Sun little little, yellow plum is precious, and vast sea faces battle array CMOS fiber spectrometers develop [J] photon journals, 2013, (01) for spectrometer:74-
78) it is, expensive due to high performance CCD or CMOS, cause system cost higher.The working method of portable spectrometer can
It is divided into two classes：One class is controlled based on host computer (computer), and a class is worked independently based on slave computer.Based on host computer control
The portable spectrometer of system is needed to be connected with computer to use, and spectra collection control, data processing and spectrum are carried out by computer
It has been shown that, application method is complicated, inconvenient to carry；The spectrometer controlled based on slave computer, is to be internally embedded microprocessor system in spectrometer
Unite, the function such as completion control, calculating, display, such as portable spectrometer of Beijing University of Technology Xu Zhe et al. proposition, (one kind is just
Take formula spectrometer, CN201666817U, 2010.12.08) spectrometer be internally integrated microprocessor, optical system, photoelectricity visit
Survey device, ADC analog-digital converters, liquid crystal display, USB module etc., complete independently spectra collection, spectrum are shown, but the system compared with
For complexity, it result in the increase of spectrometer system volume, cost rise, also, such spectrometer and usually require independent power supply and power,
In the wild or other unregulated powers supply working site in-convenience in use.
The content of the invention
It is an object of the invention to overcome problems of the prior art there is provided a kind of based on the portable of smart mobile phone
Spectrometer and its spectral method of detection, the spectrometer is with low cost, small volume, using easy to carry, can be in working site
Spectrum analysis is carried out to material using common smart mobile phone in real time.
In order to achieve the above object, spectrometer of the present invention is adopted the following technical scheme that：
Including smart mobile phone and the spectrometer peripheral module being assemblied on smart mobile phone camera；Spectrometer peripheral module
Including treating the conduction optical fiber of light signal for collecting, carrying out the optics that collimating and correcting obtains directional light for treating light signal
Colimated light system, and for carrying out the optical dispersion system that dispersion light splitting forms the dispersion striped that wavelength is arranged in order to directional light
System, optical dispersion system is located at the front of smart mobile phone camera；Smart mobile phone camera is used to shoot dispersion striped
Color fringe picture is obtained, smart mobile phone camera is connected to draw the data processing of the curve of spectrum according to color fringe picture
Module, data processing module connection display module.
Further, it is the collimation lens of directional light, Yi Jiyong that optical alignment system, which includes being used for by signal beams collimation,
Passed through in directional light and the entrance slit of shaping is carried out to directional light.
Further, the focal length of collimation lens is 10mm~100mm；The width of entrance slit is 5um~2mm.
Further, optical dispersion system uses plane diffraction grating；The slit direction of entrance slit and planar diffraction light
The groove direction of grid is parallel.
Further, there is angle between plane diffraction grating and smart mobile phone cameraApart from l,
Wherein, θ is the plane diffraction grating angle of diffraction, and i is plane diffraction grating incidence angle, and d is plane diffraction grating (3)
Grating constant；λcCentered on wavelength；
Wherein, D is effective receipts light aperture of smart mobile phone camera (4), and Δ θ is the angle of diffraction of plane diffraction grating (3)
Scope.
Further, the grating constant of plane diffraction grating be 600 grooves/mm, plane diffraction grating incidence angle i be 0~
45 degree.
Further, display module uses mobile phone display screen.
The technical scheme of detection method is：Comprise the following steps：
(1) collect and treat light signal；
(2) treat light signal and carry out collimating and correcting and dispersion light splitting, form the dispersion striped being arranged in order by wavelength；
(3) the dispersion striped obtained by smart mobile phone to step (2) is shot, and forms the coloured silk being arranged in order by wavelength
Vitta line picture；
(4) rgb value for each location of pixels point of color fringe picture that obtaining step (3) is obtained, and calculate each pixel
The corresponding light intensity value I of location point, obtains array I (x), and wherein x is picture pixels position point coordinates；
(5) according to wavelength-location of pixels nominal data λ (x), the x in array I (x) is replaced with corresponding λ, ripple is obtained
The long corresponding relation I (λ) with light intensity, the corresponding curves of spectrum of drawing data I (λ) complete the portable light based on smart mobile phone
The spectral detection of spectrometer.
Further, light intensity value I calculation formula is as follows in step (4)：
I=Max (R, G, B).
Further, step (5) medium wavelength-location of pixels nominal data λ (x) demarcating steps are as follows：
A) wavelength and respectively λ are determined using four1,λ2,λ3And λ4Light source, pass through step (1) to step (3), detection
Obtain the corresponding pixel coordinate position x of light of this four wavelength1,x2,x3And x4, and it is designated as wavelength X=[λ1 λ2 λ3 λ4], pixel
Coordinate position x=[x1 x2 x3 x4]；
B) using wavelength X as function-output, pixel coordinate position x is function variable, to wavelength X and pixel in Matlab
Coordinate position x carries out linear fit, obtains λ (x).
Compared with prior art, the present invention has following beneficial technique effect：
1st, spectrometer peripheral module is connected with smart mobile phone in spectrometer of the present invention and spectra collection and analysis can be achieved.
It is a spectrometer peripheral module, dress that spectrometer of the present invention, which will conduct optical fiber, optical alignment system and the optical dispersion system integration,
Fit on smart mobile phone camera, signal beams conduct optical fiber collection by the peripheral module treats light signal, optical alignment system
System collimating and correcting, after optical dispersion system dispersion light splitting, is transmitted to smart mobile phone camera, smart mobile phone camera receives dispersion
Optical signal afterwards, the data processing module on smart mobile phone draws incident optical signal spectrum figure, and carries out data to its spectrum
Analysis, provides the physical characteristic of exterior materials.The present invention can effectively reduce system cost, reduction system volume, without independent
Power supply, it is easy to use and carry, solve that conventional portable spectrometer is costly, volume is larger, awkward ask
Topic, can carry out effectively gathering and detecting in working site to material fluorescence spectrum, absorption spectrum etc., obtain to be measured in real time out of doors
The particular physical characteristics of material, achievable heavy metal in water ion detection, fruit freshness are detected, edible oil component is differentiated,
The function such as Detecting Pesticide and jewelry discriminating, will have a wide range of applications in daily life；
2nd, it is a spectrometer by conduction optical fiber, optical alignment system and the optical dispersion system integration in spectrometer of the present invention
Peripheral module, the module can realize can flexibly dismantle between smart mobile phone, when needing to carry out spectral detection, be assemblied in
On mobile phone, using easy to carry.
Further, the present invention places entrance slit in the light path system of spectrometer, improves systemic resolution, filters out outside
Boundary's veiling glare.
Further, the collimation lens of the invention by using 10mm~100mm focal lengths, it is ensured that the collimation effect of signal beams
Really, control system spherical aberration, while control system volume；The width of entrance slit is 5um~2mm, it is ensured that spectral resolution, simultaneously
Ensure thang-kng power.
Further, there are certain angle and distance between smart mobile phone camera and plane diffraction grating of the present invention, it is ensured that
The first-order diffraction light of plane diffraction grating is received by smart mobile phone camera completely.
Further, the present invention is using smart mobile phone camera as detector, and mobile phone display screen carries out spectrum and shown, adopts
Carry out data process＆analysis with smart mobile phone, by smart mobile phone transformation in order to light harvesting compose gather, data processing, data display and
The portable spectrometer that data analysis is integrated, using easy to carry, realizes intelligent equipment.
Collection spectra collection, data processing, drafting collection of illustrative plates, signature analysis, spectrum are shown in one in the inventive method, and
Above-mentioned functions are integrated on smart mobile phone, system cost, reduction system volume, easy to useization, intelligence can be effectively reduced
Change, the multiple spectrums such as material fluorescence spectrum, absorption spectrum can be detected in real time working site out of doors.
Brief description of the drawings
Fig. 1 is the theory structure block diagram of the present invention.
Fig. 2 is the hardware principle structure chart of the present invention.
Fig. 3 is the principle flow chart of the present invention.
Fig. 4 is the structural map based on smart mobile phone portable spectrometer embodiment.
In figure, 1. conduction optical fiber, 2. optical alignment systems, 2-1. collimation lenses, 2-2. entrance slits, 3. planar diffraction light
Grid, 4. smart mobile phone cameras, 4-1. mobile phone camera lens groups, 4-2. mobile phone cmos detectors, the envelope of 5. mobile phone display screen 6.
Mounted box.
Embodiment
The present invention is described in further details below in conjunction with the accompanying drawings.
Shown in Fig. 1, the present invention is divided into two parts：Spectrometer peripheral module and smart mobile phone.Spectrometer peripheral module
Including the conduction optical fiber 1, optical alignment system 2 and optical dispersion system being sequentially connected, optical dispersion system is taken the photograph with smart mobile phone
Picture first 4 is connected.Light signal is treated, such as reflected light, absorption light, fluorescence are collected by conduction optical fiber 1, accurate through optical alignment system 2
Straight shaping, after optical dispersion system dispersion light splitting, is transmitted to smart mobile phone camera 4；Smart mobile phone camera 4 is received after dispersion
Optical signal, incident optical signal spectrum figure is drawn based on mobile phone A PP, and data analysis is carried out to its spectrum, provides exterior materials
Physical characteristic.
Referring to Fig. 2, optical alignment system 2 includes being used for the collimation lens 2-1 for directional light by signal beams collimation, and
The entrance slit 2-2 passed through for directional light.Collimation lens 2-1 focal length can arbitrarily change, the present invention in using 10mm~
100mm, preferably 25mm, it is ensured that collimating effect, while controlling spectrometer system small volume；Entrance slit 2-2 width is 5um
~2mm, preferably 0.5mm, it is ensured that spectral resolution, while ensureing thang-kng power；Optical dispersion system includes planar diffraction light
Grid 3.Entrance slit 2-2 length be less than plane diffraction grating 3 height, the highly preferred 16mm of such as plane diffraction grating 3, then
Entrance slit 2-2 length is preferably 10mm.Smart mobile phone camera 4 is detected including mobile phone camera lens group 4-1 and CMOS
Device 4-2, cmos detector 4-2 is typically at mobile phone camera lens group 4-1 focal plane；Mobile phone camera lens group 4-
1 is in a certain angle with plane diffraction grating 3It is 0~27.5mm, l of the present invention apart from l span with a certain distance l
Preferably 25mm, it is ensured that 1 order diffraction light of plane diffraction grating diffraction is received by smart mobile phone camera 4 completely.
Wherein,The as angle of smart mobile phone camera 4 and plane diffraction grating 3
θ is the angle of diffraction of plane diffraction grating, and the angle of smart mobile phone camera 4 and plane diffraction grating 3 should be with plane
The angle of diffraction of diffraction grating 3 is equal.
I is plane diffraction grating incidence angle, is 0~45 degree, the present embodiment takes 32 degree, the placement of convenient device.
D be plane diffraction grating 3 grating constant, 600 quarter lines per millimeter；
λcCentered on wavelength, 550nm.
Therefore, calculated according to above-mentioned formulaFor 58 degree.
Wherein, D is effective receipts light aperture of smart mobile phone camera 4, and the present embodiment takes 5mm；
Δ θ is the diffraction angular region of plane diffraction grating 3, and spectral region of the present invention is 400nm~700nm, and incidence angle takes
It is 32 degree, corresponding, calculated and obtained by above-mentioned optical grating diffraction angle calculation formula, θ400nm=49.7 °, θ700nm=70.5 °, therefore Δ θ
For 20.8 °.
Therefore, calculated according to above-mentioned formula, l scope is 0~27.5mm.
Collected by conduction optical fiber 1 and transmitted to optical alignment system 2；The collimated lens 2-1 collimations of light beam turn into directional light
Afterwards, by slit 2-2, entrance slit 2-2 slit direction is parallel with the groove direction of plane diffraction grating 3, makes incoming signal light
Beam is transformed into narrow gap-like collimated light beam；Next, signal beams incide plane diffraction grating 3, plane diffraction grating 3
To incident beam dispersion light splitting, the dispersion striped being arranged in order by wavelength is formed；The color is finally received by smart mobile phone camera 4
Striped is dissipated, mobile phone camera lens group 4-1 converges in the light of different wave length at cmos detector 4-2 diverse location, thus
Form the color fringe picture that location of pixels is arranged in order with wavelength.
The grating constant of plane diffraction grating 3 is 600 grooves/mm, and grating incident angle is 32 degree.
Data processing module connects display module, and display module uses mobile phone display screen 5.Data processing module is used for basis
Color fringe picture draws the curve of spectrum, can also carry out data analysis, and data processing module uses the processor of smart mobile phone,
Realized using the APP developed based on Java language on Android platform.The present invention is carried out by the mobile phone display screen 5 of smart mobile phone
Spectrum is shown, data process＆analysis, reduction system volume, easy to useization, intelligence are carried out using smart mobile phone internal processor
Energyization.
Referring to Fig. 3, detection method comprises the following steps：
(1) collect and treat light signal；
(2) treat light signal and carry out collimating and correcting and dispersion light splitting, form the dispersion striped being arranged in order by wavelength；
(3) when carrying out spectral measurement, it is in Android platform based on Java language to start smart mobile phone spectrum APP, the APP
Upper independent development, data processing module can be integrated into；Click on after spectra collection button, the Android of APP routine call mobile phones
The dispersion striped light beam that system camera is exported to peripheral module shoots imaging, because front end peripheral module is carried out to incoming signal light
Dispersion light splitting, forms the column of colour being arranged in order by wavelength, therefore is shot with mobile phone the light beam is shot, and formation is pressed
The color fringe picture that wavelength is arranged in order, each of which location of pixels correspondence single wavelength component；
(4) APP carries out Digital Image Processing to shooting picture, reads the bitmap file for shooting picture, and obtaining step (3) is obtained
R, G, B value of each location of pixels point of color fringe picture arrived, and the corresponding light intensity value I of each location of pixels point is calculated, its
Calculation formula is as follows：
I=Max (R, G, B).
So as to obtain array I (x), wherein x is picture pixels position point coordinates, and I is pixel correspondence light intensity value；
(5) according to wavelength-location of pixels nominal data λ (x), the x in array I (x) is replaced with corresponding λ, ripple is obtained
The long corresponding relation I (λ) with light intensity, the corresponding curves of spectrum of drawing data I (λ), extract spectrum characteristic parameter and carry out analysis and
As a result show, complete the detection of the portable spectrometer based on smart mobile phone.
Wherein λ (x) data are obtained by the calibration experiment carried out in advance, and x is picture pixels position, and λ is wavelength, the tables of data
Understand the corresponding light wave long value of each location of pixels point.
The demarcating steps of the calibration experiment are as follows：
1) use and the LED/light sources of four determination wavelength are detected based on smart mobile phone spectrometer herein, four LED lights
The wavelength X in source1 λ2 λ3 λ4Respectively 455nm, 595nm, 625nm and 655nm.The light of this four wavelength is recorded in mobile phone spectrum
The location of pixels detected on instrument, respective pixel coordinate position is designated as x1,x2,x3,x4。
λ=[λ1 λ2 λ3 λ4]
X=[x1 x2 x3 x4]
2) approximately linear when due to the dispersion of plane diffraction grating 3, therefore, using wavelength X as function-output, pixel is sat
Cursor position x is function variable, carries out linear fit to wavelength X and pixel coordinate position x in matlab, obtains λ (x) function
Expression formula.
Co=polyfit (x, λ, 1)
Wherein, the order for the basic iunction for curve that polyfit provides for MATLAB softwares, for knowing discrete point
On data set, construct an analytical function, make as close possible to specified value on former discrete point, co is the λ (x) tried to achieve
Parse the coefficient of linear function formula.
In the present embodiment, λ=[455 595 625 655]
X=[1,710 2,164 2,281 2375]
It is fitted to obtain co=[0.3039-66.7499]
Therefore λ (x)=0.3039x-66.7499
X in array I (x) is replaced with corresponding λ, obtained：
I (λ) illustrates wavelength and the corresponding relation of light intensity, i.e. spectroscopic data, and calls in Java language
GetLineChartView functions, read λ (x) array as abscissa, read I (x) array and are used as ordinate, drawing data I
(λ) corresponding curve of spectrum；Finally, data analysis, the light that need to be extracted due to different test objects are carried out to spectrum by APP
Spectrum signature is differed, therefore, and the measurement object selected according to operation interface user, APP will transfer corresponding spectral signature
Extraction algorithm.
Now Spectra feature extraction method is explained by taking test paper measure glucose concentration as an example：Due to test paper reflectance spectrum with
The increase of grape concentration, spectral shape will change, the reflectance spectrum of Glucose strips has two at 465nm and 515nm
Individual obvious absorption peaks value, therefore after user's selection measurand is glucose, APP reads spectroscopic data I (λ), calculates its light
Spectrum signature amount S：
Wherein, S is concentration of glucose spectrum characteristic parameter, I515For 515nm wavelength correspondence light intensity value, I in data I (λ)465For
465nm wavelength correspondence light intensity value in I (λ) data.Experiment shows that this feature amount S and the concentration of glucose for testing solution are proportional,
Therefore, APP obtains concentration of glucose by calculating spectrum characteristic parameter, and the measurement result is shown.
It is one embodiment of spectrometer of the present invention shown in Fig. 4, wherein spectrometer peripheral module has been made by 3D printer
Into by specific structure parameter combination conduction optical fiber 1, collimation lens 2, entrance slit 2-2, plane diffraction grating 3 are integrated in into one
In individual 10cm*10cm packaging cartridge 6, the peripheral module can be realized with smart mobile phone to be connected and dismounting at any time.The present embodiment is used
Fibre bundle is collected external optical signal as conduction optical fiber 1 and transmitted to optical alignment system 2；Optical alignment system 2 is saturating by collimation
Mirror 2-1 and entrance slit 2-2 compositions, to signal beams collimating and correcting, wherein, collimation lens 2-1 focal lengths are 25mm, entrance slit
2 width are 0.5mm, and length is 10mm, and the slit direction of entrance slit 2 is consistent with the groove direction of plane diffraction grating 3；Collimation is whole
Light beam after shape is oblique to be incident upon on plane diffraction grating 3, in the present embodiment, and diffraction grating grating constant is 600 grooves/mm,
Grating incident angle is 32 degree；The diffraction dispersed light beam of smart mobile phone camera 4-1 receiving planes diffraction grating 3, smart mobile phone is taken the photograph
Picture first 4 is with plane diffraction grating 3 in 58 degree of angles, and distance is 25mm；Finally, based on smart mobile phone APP, spectral information is drawn,
And data analysis is carried out to spectrum, show the physical characteristic of testee spectrum and measurement of species in mobile phone display screen 5.
The present invention solves that conventional portable spectrometer is costly, volume is larger, it is inconvenient for use the problem of there is provided one
The portable spectrometer based on smart mobile phone is planted, the spectrometer can effectively reduce system cost, reduction system volume, user
Just, material fluorescence spectrum, absorption spectrum etc. can be detected in real time working site out of doors.The present invention also has following excellent
Point：
1. it is a spectrometer peripheral module, assembling by conduction optical fiber 1, optical alignment system 2, the optical dispersion system integration
Spectra collection can be achieved on smart mobile phone camera 4, it is easy to carry using flexible, also, use smart mobile phone camera
4 as spectrometer detector, without CCD or cmos detector is separately configured, effectively reduce system cost, reduce system body
Product.The present invention realizes miniaturization, integrated, cheap portable spectrometer.
2. using the mobile phone A PP developed based on Java language on Android platform, complete to by the spectrum of light signal
Draw, spectrum is shown and spectral data analysis, realizes intelligentized portable spectrometer.
3. the present invention can complete effective collection to material fluorescence spectrum, absorption spectrum, reflectance spectrum etc., and spectrum is entered
Row analysis, obtains the particular physical characteristics of test substance, can be achieved heavy metal in water ion detection, the detection of fruit freshness,
The functions such as edible oil component resolution, Detecting Pesticide and jewelry discriminating, will have a wide range of applications in daily life.
Claims (10)
1. a kind of portable spectrometer based on smart mobile phone, it is characterised in that：Including smart mobile phone and it is assemblied in intelligent hand
Spectrometer peripheral module on machine camera (4)；Spectrometer peripheral module includes being used to collect the conduction optical fiber for treating light signal
(1) optical alignment system (2) that collimating and correcting obtains directional light, is carried out for treating light signal, and for directional light
The optical dispersion system that dispersion light splitting forms the dispersion striped that wavelength is arranged in order is carried out, optical dispersion system is located at smart mobile phone
The front of camera (4)；Smart mobile phone camera (4) is used to dispersion striped shoot to obtain color fringe picture, intelligence
Mobile phone camera (4) is connected to draw the data processing module of the curve of spectrum, data processing module according to color fringe picture
Connect display module.
2. a kind of portable spectrometer based on smart mobile phone according to claim 1, it is characterised in that：Optical alignment system
System (2) includes being used for the collimation lens (2-1) for directional light by signal beams collimation, and is passed through and to parallel for directional light
Light carries out the entrance slit (2-2) of shaping.
3. a kind of portable spectrometer based on smart mobile phone according to claim 2, it is characterised in that：Collimation lens
The focal length of (2-1) is 10mm~100mm；The width of entrance slit (2-2) is 5um~2mm.
4. a kind of portable spectrometer based on smart mobile phone according to claim 2, it is characterised in that：Optical dispersion system
System is using plane diffraction grating (3)；The slit direction of entrance slit (2-2) is parallel with the groove direction of plane diffraction grating (3).
5. a kind of portable spectrometer based on smart mobile phone according to claim 4, it is characterised in that：Planar diffraction light
There is angle between grid (3) and smart mobile phone camera (4)Apart from l,
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<mi>c</mi>
</msub>
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</mrow>
Wherein, θ is the plane diffraction grating angle of diffraction, and i is plane diffraction grating incidence angle, and d is the grating of plane diffraction grating (3)
Constant；λcCentered on wavelength；
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</mrow>
</mfrac>
</mrow>
Wherein, D is effective receipts light aperture of smart mobile phone camera (4), and Δ θ is the diffraction angular region of plane diffraction grating (3).
6. a kind of portable spectrometer based on smart mobile phone according to claim 5, it is characterised in that：Planar diffraction light
The grating constant of grid (3) is 600 grooves/mm, and plane diffraction grating incidence angle i is 0~45 degree.
7. a kind of portable spectrometer based on smart mobile phone according to claim 1, it is characterised in that：Display module is adopted
With mobile phone display screen (5).
8. a kind of spectral method of detection of the portable spectrometer based on smart mobile phone：It is characterized in that：Comprise the following steps：
(1) collect and treat light signal；
(2) treat light signal and carry out collimating and correcting and dispersion light splitting, form the dispersion striped being arranged in order by wavelength；
(3) the dispersion striped obtained by smart mobile phone to step (2) is shot, and forms the color-bar being arranged in order by wavelength
Line picture；
(4) rgb value for each location of pixels point of color fringe picture that obtaining step (3) is obtained, and calculate each location of pixels
The corresponding light intensity value I of point, obtains array I (x), and wherein x is picture pixels position point coordinates；
(5) according to wavelength-location of pixels nominal data λ (x), the x in array I (x) is replaced with corresponding λ, obtain wavelength with
The corresponding curve of spectrum of the corresponding relation I (λ) of light intensity, drawing data I (λ), completes the portable spectrometer based on smart mobile phone
Spectral detection.
9. a kind of spectral method of detection of portable spectrometer based on smart mobile phone according to claim 8：Its feature
It is：Light intensity value I calculation formula is as follows in step (4)：
I=Max (R, G, B).
10. a kind of spectral method of detection of portable spectrometer based on smart mobile phone according to claim 8：Its feature
It is：Step (5) medium wavelength-location of pixels nominal data λ (x) demarcating steps are as follows：
A) wavelength and respectively λ are determined using four1,λ2,λ3And λ4Light source, by step (1) to step (3), detection is obtained
The corresponding pixel coordinate position x of light of this four wavelength1,x2,x3And x4, and it is designated as wavelength X=[λ1 λ2 λ3 λ4], pixel coordinate
Position x=[x1 x2 x3 x4]；
B) using wavelength X as function-output, pixel coordinate position x is function variable, to wavelength X and pixel coordinate in Matlab
Position x carries out linear fit, obtains λ (x).
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