CN102829849B - Device and method for multi-index parametric measurement of pears - Google Patents
Device and method for multi-index parametric measurement of pears Download PDFInfo
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- CN102829849B CN102829849B CN201210287399.7A CN201210287399A CN102829849B CN 102829849 B CN102829849 B CN 102829849B CN 201210287399 A CN201210287399 A CN 201210287399A CN 102829849 B CN102829849 B CN 102829849B
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Abstract
The invention discloses a device for multi-index parametric measurement of pears. The device comprises a dark box, an electronic weighing rotary table, a height measuring device, a lighting module, a spectrum acquisition module and a control unit. The electronic weighing rotary table is positioned in the dark box and used for measuring weight of the pears; the height measuring device is positioned in the dark box and used for measuring height of the pears; the lighting module is used for transmitting detection light to the pears; the spectrum acquisition module is used for receiving reflection light of the pears; and the control unit is used for receiving signals of the electronic weighing rotary table and the height measuring device to calculate the size of a sample and further used for receiving signals of the spectrum acquisition module to calculate the soluble solid content of the sample. The invention further discloses a method for multi-index parametric measurement of pears by means of the device for multi-index parametric measurement of pears. By means of the device and the method for multi-index parametric measurement of pears, rapid detection of various physical parameters of the weight, height, size and soluble solid content of the pears is realized, and quickness, accuracy and low cost in detection and low environment pollution are achieved.
Description
Technical field
The present invention relates to fruit detection field, be specifically related to a kind of many index parameters determinator and method of pears.
Background technology
Soluble solid refers to the general name of all compounds that are dissolved in water in liquid or fluid food.In fruit, mainly comprise the materials such as soluble saccharide, protein, acid, vitamin, it is an important indicator that characterizes fruit maturity.
Soluble solid content in fruit has very large impact to its mouthfeel, it is one of important indicator of evaluating fruit internal quality, in addition, weight, height and the volume of fruit is the key factor that needs consideration in sizing screening process, therefore, need to the weight of soluble solid content, fruit in fruit, height and volume be realized fast and accurately and being measured.
What the measurement of the soluble solid to fruit in national standard adopted is refractometer method, Gai Faxudui fruit tissue carries out fragmentation, utilize the refractive index of light to measure, not only time-consuming, effort, consumables cost are high, and destroy the integrity degree of fruit, fruit after detection can not eat again, has caused waste.
By the Infrared irradiation of a branch of different wave length, to the molecule of material, the infrared light of some specific wavelength is absorbed, and forms the infrared absorption spectrum of this part.Every kind of molecule have consisting of with the exclusive infrared absorption spectrum of structures shape, can carry out structure analysis and evaluation to molecule accordingly.
Infrared absorption spectrum is ceaselessly done vibration and rotational motion and is produced by molecule, and molecular vibration refers in molecule that each atom is done relative motion near equilibrium position, and polyatomic molecule can form multiple vibration graphics.The energy of molecular vibration is just in time corresponding with the photon energy of infrared light, therefore, in the time that the vibrational state of molecule changes, just can launch infrared spectrum, also can produce infrared absorption spectrum because of infrared ray excited molecular transition.
At present, the existing visible infrared of utilizing is evaluated the pol of fruit and the report of acidity.
Application number is 201010247589.7 disclosure of the invention, and a kind of fruit internal quality detects stage division, be specially a kind of fruit internal quality based on supporting vector machine model and Near Infrared Spectroscopy Detection Technology and detect stage division, the method is for the ambiguity of fruit mouthfeel, degree of membership concept is introduced to the attributional analysis of fruit, measure in the process of degree of membership at definite fruit quality, consider the Q factor that fruit near infrared light spectral property and physics and chemistry are measured simultaneously, utilize the degree of membership of describing based on support vector data field to revising based on pol and the definite mensuration degree of membership of acidity, thereby set up out the supporting vector machine model of effective fruit grading.
In fruit, the content of soluble solid is the key factor of weighing fruit quality, mensuration sample preparation for fruit soluble solid content in prior art is loaded down with trivial details, waste time and energy, therefore, need to provide a kind of method of measuring fast and effectively soluble solid in fruit.
Summary of the invention
The invention provides a kind of many index parameters pick-up unit and detection method of pears, in keeping the integrity degree of pears, weight to pears, highly, volume and soluble solid measure, simple to operate, improves the assess effectiveness of the quality to pears.
Many index parameters determinator of pears, comprising:
Camera bellows;
Be positioned at described camera bellows, for measuring the electronic-weighing rotation platform of weight of pears;
Be positioned at described camera bellows, for measuring the height measuring device of height of pears;
For detect the illumination module of light to pears transmitting;
For receiving the catoptrical spectra collection module of pears;
For receiving the calculated signals sample volume of described electronic-weighing rotation platform and height measuring device, and for receiving the control module of described spectra collection cell signal calculation sample soluble solid content;
Described illumination module is included in LED pointolite array, reflection cap, the first condenser lens, the second condenser lens and the output optical fibre in light path, arranged successively, described LED pointolite array comprises each one of the LED pointolite of 610nm, 680nm, 690nm, 950nm, 1027nm, 1131nm, 1220nm, 1437nm, 1484nm, 1580nm, 1667nm and 1768nm, and all LED pointolites are circular arrangement and are uniformly distributed.
By the carpopodium of pears upward, fruit calyx is placed on the electronic-weighing rotation platform in described camera bellows down, utilize electronic-weighing rotation platform to weigh the weight G that obtains pears, utilize described height measuring device to measure the height H of pears, described height H refer to carpopodium root to fruit the distance between calyx, gained weight G and height H are brought into V=0.218*G+0.123*H-8.8 and are calculated the volume V of pears.
While highly measurement, carpopodium can be depressed into and pears top flush position, and the general arrangement of height measuring device is the same with the device of existing measurement height.
Described illumination module is launched the detection light of specific wavelength to the pears in camera bellows, described electronic-weighing rotation platform rotation, described spectra collection module gathers the reflected light of the different parts of different wave length place pears, described control module receives described reflected light, the catoptrical reflectivity that extracts different wave length, utilizes formula Y=12.976X
1+ 12.793X
2-22.304X
3+ 26.986X
4+ 357.516X
5-560.708X
6+ 205.118X
7+ 293.066X
8-390.814X
9+ 290.461X
10-257.144X
11+ 42.664X
12+ 6.2 calculate the soluble solid content of pears, and in formula, Y is soluble solid content in pears; X
1～X
12be respectively the reflectivity of wavelength 610nm, 680nm, 690nm, 950nm, 1027nm, 1131nm, 1220nm, 1437nm, 1484nm, 1580nm, 1667nm, the corresponding pears of 1768nm.
Pears are placed in described camera bellows, isolate extraneous light, catoptrical collection forms interference to pears to avoid extraneous light, improves the accuracy of the testing result of pears soluble solid.
Described LED pointolite sends the light of specific wavelength, after reflection cap reflection, becomes directional light from the first condenser lens, and this directional light, after the second condenser lens focuses on, enters output optical fibre, is passed to the top of pears in camera bellows by output optical fibre.
As preferably, the optical axis of every LED pointolite becomes 30 degree angles with the axis of described annular along optical path direction.So that focus in suitable distance.
As preferably, described spectra collection module comprises the light sensor that receives the catoptrical reception optical fiber of sample and receive this reception signal that optical fiber transmits.
The detection light of the corresponding different wave length of described light sensor arranges, be that corresponding wavelength 610nm, 680nm, 690nm, 950nm, 1027nm, 1131nm, 1220nm, 1437nm, 1484nm, 1580nm, 1667nm and 1768nm are respectively equipped with light sensor, described light sensor receives the reflected light from the different wave length of pears.
As preferably, the transmitting terminal of described output optical fibre and the collection terminal that receives optical fiber are all positioned at described camera bellows.
The light that the output optical fibre of described illumination module sends LED pointolite array is passed to output optical fibre and is positioned at the transmitting terminal of camera bellows, to the detection light of the pears transmitting different wave length in camera bellows, detect light and obtain reflected light after pears reflection, after reflected light is gathered by the collection terminal of described reception optical fiber, by receiving Optical Fiber Transmission to control module, obtain soluble solid content in pears by control module processing.
As preferably, be provided with the telescoping mechanism of regulation output optical fiber and the second condenser lens spacing.
Described telescoping mechanism can regulate the distance between described output optical fibre and the second condenser lens, it is the detection light light intensity magnitude of the second condenser lens output of receiving of regulation output optical fiber, after pears reflection, obtain suitable reflected light light intensity, for calculating the soluble solid content of pears.
As preferably, the sidewall of described camera bellows is provided with two closed slides of vertical layout and the elevating bracket sliding along closed slide, described elevating bracket is provided with the ferrule inserting in camera bellows, and described output optical fibre and reception optical fiber extend in camera bellows along described ferrule.
Described elevating bracket can slide up and down along closed slide, drives ferrule to slide up and down, and also adjusts the transmitting terminal of output optical fibre and accepts the position of the collection terminal of optical fiber, is located at the position, equator of pears, is also the position of the circumference maximum of pears.
Many index parameters determinator based on above-mentioned pears, the present invention also provides a kind of method of utilizing many index parameters determinator of these pears to measure many index parameters of pears, comprises the following steps:
(1) pears are put into described camera bellows, utilized described electronic-weighing rotation platform to measure the weight G of pears, utilize described height measuring device measuring height H;
(2), by the weight G of pears and height H input information control module, control module, according to formula V=0.218*G+0.123*H-8.8, calculates the volume V of pears;
(3) be determined to few two check points along the position, equator of pears, described illumination module sends and detects light to these two check points, utilizes spectra collection module to gather each check point and is in the reflectivity of wavelength for 610nm, 680nm, 690nm, 950nm, 1027nm, 1131nm, 1220nm, 1437nm, 1484nm, 1580nm, 1667nm and the corresponding pears of 1768nm;
(4) by gained reflectivity Input Control Element, control module is according to multiple linear regression equations: Y=12.976X
1+ 12.793X
2-22.304X
3+ 26.986X
4+ 357.516X
5-560.708X
6+ 205.118X
7+ 293.066X
8-390.814X
9+ 290.461X
10-257.144X
11+ 42.664X
12+ 6.2, calculate the soluble solid content of pears;
In formula, Y is soluble solid content in pears; X
1～X
12be respectively the reflectivity of wavelength 610nm, 680nm, 690nm, 950nm, 1027nm, 1131nm, 1220nm, 1437nm, 1484nm, 1580nm, 1667nm, the corresponding pears of 1768nm.
By the position, equator to pears, i.e. the position of the circumference maximum of pears, the light of transmitting different wave length, gathers the reflected light information of pears, extracts the reflectivity of different wave length place pears, calculates the soluble solid content of pears.
The present invention set up for calculating the equation V=0.218*G+0.123*H-8.8 of volume of pears, wherein, the unit of weight G is g, the unit of height H is cm, the unit of volume V is cm
3; Volume calculating for other fruit is inapplicable, if need to detect other fruit, need set up in addition the equation of volume calculated.
Because volume V comes by equation model, therefore the numerical value unit of equation both sides does not participate in calculating, and is only the value of being convenient to explicit data.
The present invention realized the weight of pears, highly, the fast detecting of the multinomial physical parameter of volume and soluble solid content, detect quick and precisely, testing cost is low, environmental pollution is little.
Accompanying drawing explanation
Fig. 1 is many index parameters determinator schematic diagram of a kind of pears of the present invention;
Fig. 2 is many index parameters determinator illumination module diagram of a kind of pears of the present invention;
Fig. 3 is the side view of Fig. 2;
Fig. 4 is the side view of camera bellows in Fig. 1;
Fig. 5 is the schematic diagram of pears;
The soluble solid content of the pears that Fig. 6 records while being the inventive method modeling and the graph of a relation of actual solid content;
The soluble solid content of pears and the graph of a relation of actual solid content that Fig. 7 records while being the inventive method prediction.
Embodiment
Below in conjunction with accompanying drawing, many index parameters determinator of a kind of pears of the present invention is described in detail.
Many index parameters determinator of pears, comprising: camera bellows 11, be positioned at camera bellows 11 for measure pears 10 weight electronic-weighing rotation platform 9, be positioned at camera bellows 11 for measure pears 10 height height measuring device 14, for detecting the illumination module 2 of light to pears 10 transmitting, for receiving the catoptrical spectra collection module of pears 10 and for receiving the calculated signals sample volume of described electronic-weighing rotation platform 9 and height measuring device 14 and receiving the control module 3 of described spectra collection cell signal calculation sample soluble solid content.
Camera bellows 11 is provided with sliding door 8, and pears 10 are put into after camera bellows 11, closes sliding door 8, can reduce the catoptrical interference of extraneous light to spectra collection module collection pears 10.
Spectra collection module comprises the light sensor that receives the catoptrical reception optical fiber of sample and receive this reception signal that optical fiber transmits, the detection light of corresponding LED pointolite 19 different wave lengths of light sensor arranges, be that corresponding wavelength 610nm, 680nm, 690nm, 950nm, 1027nm, 1131nm, 1220nm, 1437nm, 1484nm, 1580nm, 1667nm and 1768nm are respectively equipped with light sensor, light sensor receives the reflected light from the different wave length of the different parts of pears 10.
The collection terminal of the transmitting terminal of output optical fibre 15 and reception optical fiber is all positioned at camera bellows 11, the light that the output optical fibre 15 of illumination module 2 sends LED pointolite 19 arrays is passed to output optical fibre 15 and is positioned at the transmitting terminal of camera bellows 11, launch the detection light of different wave length to pears 10, detect light and obtain reflected light after pears 10 reflections, after reflected light is gathered by the collection terminal that receives optical fiber, by receiving Optical Fiber Transmission to control module 3, process by control module 3 soluble solid content that obtains pears 10.
Be provided with the telescoping mechanism 16 of regulation output optical fiber 15 and the second condenser lens 17 spacing, telescoping mechanism 16 can regulation output optical fiber 15 and the second condenser lens 17 between distance, it is the detection light light intensity magnitude that the second condenser lens 17 that regulation output optical fiber 15 receives is exported, after the reflection of pears 10, obtain suitable reflected light light intensity, for the soluble solid content of pears 10.
Be provided with and place control module 3, the support of illumination module 2, is also provided with the display screen 4 for indicative control unit result on support, spectra collection module switch 7 and power switch 6.
The sidewall of camera bellows 11 is provided with two closed slides 12 of vertical layout and the elevating bracket 28 sliding along closed slide 12, the both sides of closed slide 12 are oppositely arranged with the first rectangular strip 27 of V-thread and the second rectangular strip 29, wherein the first rectangular strip 27 is fixing, the second rectangular strip 29 can slide up and down, elevating bracket 28 is annular, elevating bracket 28 excircles are provided with the screw thread being meshed with the first rectangular strip 27 and the second rectangular strip 29, elevating bracket 28 is provided with the ferrule 13 inserting in camera bellows 11, output optical fibre 15 and reception optical fiber extend in camera bellows 11 along ferrule 13, by driving the lifting of the second rectangular strip 29, drive elevating bracket 28 to slide up and down along the first rectangular strip 27, engaging between the first rectangular strip 27 and the second rectangular strip 29 and elevating bracket 28, can keep the steady lifting of elevating bracket 28 and be convenient to control and calculate the height of lifting.
Mate adopts V-thread, and not only intensity is high, and root of the tooth is thick, and angle of thread is large, and equlvalent coefficient of friction is large, and self-locking property is good, and transmission efficiency is low, and elevating bracket is adjusted to after correct position, can fix the position of elevating bracket.
When many index parameters determinator of pears of the present invention is worked, by the carpopodium of pears 10 30 upward, fruit calyx 31 down, put into camera bellows 11, close sliding door 8, regulate elevating bracket 28 height, make the transmitting terminal of output optical fibre 15 and the collection terminal of reception optical fiber be positioned at the position, equator 32 of pears 10, turn on the power switch 6, rotary electronic weighing platform 9 weighs the weight G of pears 10, height measuring device 14 is measured the height H of pears 10, and gained information is passed to control module 3, illumination module 2 is sent 610nm, 680nm, 690nm, 950nm, 1027nm, 1131nm, 1220nm, 1437nm, 1484nm, 1580nm, the light of 1667nm and 1768nm wavelength, expose to pears 10 through the transmitting terminal of output optical fibre 15, open spectra collection module switch 7, rotate rotary electronic weighing platform, every rotation once, the collection terminal that receives optical fiber gathers the reflected light signal of these position pears 10, be passed to control module 3, after control module 3 is processed, by the weight of pears 10, highly, volume, soluble solid content is presented on display screen 4.
Utilize many index parameters determinator of above-mentioned pears to measure the method for many index parameters of pears, comprise the following steps:
(1) pears are put into described camera bellows, utilized described electronic-weighing rotation platform to measure the weight G of pears, utilize described height measuring device measuring height H;
(2), by the weight G of pears and height H input information control module, control module, according to formula V=0.218*G+0.123*H-8.8, calculates the volume V of pears; Wherein, the unit of weight G is g, and the unit of height H is cm, and the unit of V is cm
3;
(3) be determined to few two check points along the position, equator of pears, described illumination module sends and detects light to these two check points, utilizes spectra collection module to gather each check point and is in the reflectivity of wavelength for 610nm, 680nm, 690nm, 950nm, 1027nm, 1131nm, 1220nm, 1437nm, 1484nm, 1580nm, 1667nm and the corresponding pears of 1768nm;
(4) by gained reflectivity Input Control Element, control module is according to multiple linear regression equations: Y=12.976X
1+ 12.793X
2-22.304X
3+ 26.986X
4+ 357.516X
5-560.708X
6+ 205.118X
7+ 293.066X
8-390.814X
9+ 290.461X
10-257.144X
11+ 42.664X
12+ 6.2, calculate the soluble solid content of pears; Soluble solid content unit is Brix;
In formula, Y is soluble solid content in pears; X
1～X
12be respectively the reflectivity of wavelength 610nm, 680nm, 690nm, 950nm, 1027nm, 1131nm, 1220nm, 1437nm, 1484nm, 1580nm, 1667nm, the corresponding pears of 1768nm.
Say from microcosmic, the active state of molecule of composition pears is subject to detecting the energy excitation of light, produces different energy level transitions, absorbs and releases energy, and forms corresponding with molecule reflectance spectrum and absorption spectrum.Different chemical bonds, as O-H, N-H, C-H etc., the rotation of chemical bond and stretching vibration, absorb the light of specific wavelength in transition between energy level meeting, and excite generation characteristic peak, can judge the composition of material according to the intensity of characteristic peak and wave number.
The vibration information of the chemical bond such as N-H, C-N, N-H in soluble solid and the related chemical constituents of wavelength used and pears is relevant, and these information can reflect the number of soluble solid content in pears.For example 1220nm has reflected the one-level stretching vibration of soluble solid N-H and the plain bending of the N-H vibration of pears, 1437nm has reflected the soluble solid of pears and the N-H of related chemical constituents, the combination such as C-N stretching vibration information, 1580nm has reflected the flexible and flexural vibrations information of the soluble solid of pears, 680nm and 690nm have reflected aromatic hydrocarbons information in the soluble solid of pears, 950nm has reflected amido and hydroxyl information in the soluble solid of pears, 1027nm has reflected amido information in the soluble solid of pears, 1131nm has reflected methyl information in the soluble solid of pears, 1484nm has reflected primary amide information in the soluble solid of pears, 1667nm has reflected aromatic hydrocarbons and methyl information in the soluble solid of pears, 1768nm has reflected methylene and methine information in the soluble solid of pears, application arithmetic of linearity regression carries out modeling analysis to above-mentioned characteristic wavelength, set up the soluble solid content of pears and the linear equation of characteristic wavelength.
The selected characteristic wavelength of the present invention (wherein has a conduct with reference to wavelength, all the other 11 participate in calculating) only for the fast detecting of the soluble solid of pears, if need to measure other indexs of other fruit or measurement pears, need to again select specific wavelength, pass through multiple linear regression, set up model, calculate corresponding desired value.
Utilize index of correlation that method provided by the invention sets up model in table 1, wherein, when modeling set representations is set up model, the soluble solid content matching that utilizes the reflectivity of pears and existing method to test the pears that obtain obtains model equation, forecast set represents, when prediction, set up after model the typical curve that the soluble solid content matching that uses pears to obtain according to model equation obtains.
Table 1
Embodiment 1～10
Utilize the weight of apparatus and method provided by the invention to pears, highly, volume, soluble solid content test, test result is in table 2.
Table 2
By table 2 data, can find out, utilize the weight of the pears that the inventive method records, highly, volume, soluble solid content and existing method test the data that obtain and approach, utilize weight that the present invention can Fast Measurement pears, highly, volume, soluble solid content, reliable results.
Claims (6)
1. utilize many index parameters determinator of pears to measure a method for many index parameters of pears, it is characterized in that,
Many index parameters determinator of described pears comprises:
Camera bellows;
Be positioned at described camera bellows, for measuring the electronic-weighing rotation platform of weight of pears;
Be positioned at described camera bellows, for measuring the height measuring device of height of pears;
For detect the illumination module of light to pears transmitting;
For receiving the catoptrical spectra collection module of pears;
For receiving the calculated signals sample volume of described electronic-weighing rotation platform and height measuring device, and for receiving the control module of described spectra collection module by signal calculation sample soluble solid content;
Described illumination module is included in LED pointolite array, reflection cap, the first condenser lens, the second condenser lens and the output optical fibre in light path, arranged successively, described LED pointolite array comprises each one of the LED pointolite of 610nm, 680nm, 690nm, 950nm, 1027nm, 1131nm, 1220nm, 1437nm, 1484nm, 1580nm, 1667nm and 1768nm, and all LED pointolites are circular arrangement and are uniformly distributed;
The method of many index parameters of described mensuration pears comprises the following steps:
(1) pears are put into described camera bellows, utilized described electronic-weighing rotation platform to measure the weight G of pears, utilize described height measuring device measuring height H;
(2), by the weight G of pears and height H input information control module, control module, according to formula V=0.218*G+0.123*H-8.8, calculates the volume V of pears;
(3) be determined to few two check points along the position, equator of pears, described illumination module sends and detects light to these two check points, utilizes spectra collection module to gather each check point and is in the reflectivity of wavelength for 610nm, 680nm, 690nm, 950nm, 1027nm, 1131nm, 1220nm, 1437nm, 1484nm, 1580nm, 1667nm and the corresponding pears of 1768nm;
(4) by gained reflectivity Input Control Element, control module is according to multiple linear regression equations: Y=12.976X
1+ 12.793X
2-22.304X
3+ 26.986X
4+ 357.516X
5-560.708X
6+ 205.118X
7+ 293.066X
8-390.814X
9+ 290.461X
10-257.144X
11+ 42.664X
12+ 6.2, calculate the soluble solid content of pears;
In formula, Y is soluble solid content in pears; X
1～X
12be respectively the reflectivity of wavelength 610nm, 680nm, 690nm, 950nm, 1027nm, 1131nm, 1220nm, 1437nm, 1484nm, 1580nm, 1667nm, the corresponding pears of 1768nm.
2. the method for many index parameters of mensuration pears as claimed in claim 1, is characterized in that, the optical axis of every LED pointolite becomes 30 degree angles with the axis of described annular along optical path direction.
3. the method for many index parameters of mensuration pears as claimed in claim 1, is characterized in that, described spectra collection module comprises the light sensor that receives the catoptrical reception optical fiber of sample and receive this reception signal that optical fiber transmits.
4. the method for many index parameters of mensuration pears as claimed in claim 3, is characterized in that, the collection terminal of the transmitting terminal of described output optical fibre and reception optical fiber is all positioned at described camera bellows.
5. the method for many index parameters of mensuration pears as claimed in claim 4, is characterized in that, is provided with the telescoping mechanism of regulation output optical fiber and the second condenser lens spacing.
6. the method for many index parameters of mensuration pears as claimed in claim 5, it is characterized in that, the sidewall of described camera bellows is provided with two closed slides of vertical layout and the elevating bracket sliding along closed slide, described elevating bracket is provided with the ferrule inserting in camera bellows, and described output optical fibre and reception optical fiber extend in camera bellows along described ferrule.
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| CN110823339B (en) * | 2018-08-10 | 2021-04-09 | 河南工业大学 | Granary state detection method and system based on two circles of pressure sensors on bottom surface |
| CN113075161B (en) * | 2021-03-31 | 2023-11-17 | 重庆电子工程职业学院 | Near infrared fruit internal quality detection system |
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| JP3923011B2 (en) * | 2002-12-24 | 2007-05-30 | 株式会社クボタ | Fruit and vegetable quality evaluation equipment |
| CN101074927A (en) * | 2007-06-22 | 2007-11-21 | 浙江大学 | Method for diagnosing fruit diseases based on visible and near-infrared spectral characteristic band |
| WO2010060915A2 (en) * | 2008-11-28 | 2010-06-03 | Siemens Aktiengesellschaft | Measuring apparatus and method for spectroscopic measurements using led light |
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