CN103900977B - A kind of full spectrometer for detecting food fast and detection method thereof - Google Patents
A kind of full spectrometer for detecting food fast and detection method thereof Download PDFInfo
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Abstract
The invention discloses a kind of full spectrometer for detecting food fast and detection method thereof, comprise: the output terminal of ARM embedded system successively with power stabilization circuit, wideband light source and lighting fiber connect, the incident ray that wideband light source sends is irradiated to the solution place to be measured in sample cell by lighting fiber and obtains emergent ray after being absorbed by solvent portions to be measured, emergent ray is imported to after full spectrum light splitting optical path carries out light splitting by measuring optical fiber and is irradiated to ccd detector, ccd detector detects the emergent ray after light splitting and detection data is sent to signal acquisition circuit, signal acquisition circuit obtains full spectral information after processing measurement data and is sent to ARM embedded system, ARM embedded system is also connected with pin-saving chip and display module.The present invention is small volume not only, compact conformation, is convenient for carrying, and measures accurately, can be widely used in the Site Detection of food.
Description
Technical field
The present invention relates to the safety monitoring field of food, particularly relating to a kind of full spectrometer for detecting food fast and detection method thereof.
Background technology
In recent years, agriculture is residual to exceed standard, malicious rice, melamine, clenbuterol hydrochloride, trench wet goods food safety affair occur again and again, become a mortal malady of harm people ' s health, therefore society more and more payes attention to for food-safety problem, food quality supervision department is also in the construction constantly strengthening food safety detection system, be intended to realize the full chain monitoring to links such as food production, storage, transport, sale, thus food-safety problem can be found in time fast, its negative effect is dropped to minimum.
The contents such as food safety detection is residual mainly for agricultural and veterinary chemicals, pathogenic microorganisms, heavy metal, biotoxin, illegal additive and abuse food additives.Traditional detection method adopts off-line sampling Detection mode, namely the large-scale experiment room instrument such as chromatograph-mass spectrometer coupling, spectrum-mass spectrometry is adopted, this mode accuracy is high, but efficiency is low, testing requirement fast in enormous quantities cannot be adapted to, and instrument is bulky carries inconvenience, expensive, therefore the method can only use as arbitration.
The rapid detection apparatus that current food inspection scene adopts is based on colourimetry principle substantially: the light of specific wavelength, by being partially absorbed after solution to be measured, can calculate the content of measured object according to langbobier law and calibration curve.Because different materials often has different characteristic absorption wavelength, therefore the words of many kinds of substance are detected with an instrument, this instrument must have the function of multiwave length spectro, its concrete technology realizes mainly containing following several mode: one, multi-wavelength LED combined method, namely the LED of multiple different wave length is adopted to form combined light source, the method realizes comparatively simple, low price, but when the substance classes that instrument detects is more, the a variety of LED combination of corresponding needs, cause instrument system huge miscellaneous, and once instrument dispatches from the factory and will detect new wavelength coverage and also will change LED light source, very inconvenience, also greatly increases the maintenance cost of instrument, two, optical filter method, when the substance classes that instrument detects is more, needs multiple optical filter, and the installation of multiple optical filter causes instrument system huge miscellaneous equally, and after instrument dispatches from the factory, once need to detect new wavelength coverage optical filter will be changed too, very inconvenience, three, raster optical spectroscopy, the instrument based on this principle must have the scanning rotating mechanism of grating, and anti-interference is bad, and instrument compare both bulk, and test speed is comparatively slow, the inefficiency when food inspection onsite application.
Summary of the invention
In order to solve above-mentioned technical matters, the object of this invention is to provide a kind of compact conformation, being convenient for carrying and measuring accurate for detecting the full spectrometer of food fast.Another object of the present invention be to provide a kind of measure convenient and accurate for detecting the detection method of the full spectrometer of food fast.
The technical solution adopted for the present invention to solve the technical problems is:
For detecting a full spectrometer for food fast, comprising ARM embedded system, power stabilization circuit, wideband light source, lighting fiber, measuring optical fiber, ccd detector, signal acquisition circuit, employing fixed grating carry out the full spectrum light splitting optical path of light splitting and the sample cell for placing solution to be measured;
The output terminal of described ARM embedded system successively with power stabilization circuit, wideband light source and lighting fiber connect, the incident ray that described wideband light source sends is irradiated to the solution place to be measured in sample cell by lighting fiber and obtains emergent ray after being absorbed by solvent portions to be measured, emergent ray is imported to after full spectrum light splitting optical path carries out light splitting by measuring optical fiber and is irradiated to ccd detector, ccd detector detects the emergent ray after light splitting and detection data is sent to signal acquisition circuit, signal acquisition circuit obtains full spectral information after processing measurement data and is sent to ARM embedded system,
Described ARM embedded system is also connected with pin-saving chip and display module.
Further, described full spectrum light splitting optical path comprises slit, collimation concave mirror, plane grating and focusing concave mirror, be irradiated to after the emergent ray that described measuring optical fiber imports carries out spatial filtering by slit on collimation concave mirror and carry out collimating and then obtaining parallel rays, parallel rays is irradiated to the enterprising circumstances in which people get things ready for a trip of plane grating and falls apart, and the light after dispersion arrives after focusing concave mirror focuses on and is irradiated on ccd detector.
Further, the width range of described slit is 5 μm ~ 100 μm, and described collimation concave mirror and focusing concave mirror all adopt spherical reflector of aluminizing, and described plane grating employing linear density range is the blazed grating of the sawtooth grooved of 300 lines/mm ~ 1200 line/mm.
Further, described power stabilization circuit adopts constant voltage circuit.
Further, described sample cell adopts light path to be the quartz colorimetric utensil of 10mm.
Further, described lighting fiber and measuring optical fiber all adopt doped fused silica multimode optical fiber, and the core diameter scope of optical fiber is 50 μm ~ 1000 μm, and fibre-optic package interface is SMA905.
Further, described ccd detector adopts the linear array detector of 3648 × 1 pixels and pixel size is 8 × 200 μm.
Further, what described ARM embedded system was also connected in expansion interface, printing device, Ethernet wired module, Wi-Fi wireless module and GSM/GPRS wireless module is one or more.
The present invention solves another technical scheme that its technical matters adopts:
For detecting a detection method for the full spectrometer of food fast, comprising:
S1, the incident ray sent by wideband light source are irradiated to solution place to be measured and are obtained emergent ray by after solvent portions absorption to be measured;
S2, emergent ray imported to be irradiated on ccd detector after a full spectrum point optical circuit carries out light splitting and detect;
S3, the detection data of ccd detector are sent to signal acquisition circuit carry out processing the full spectral information of rear acquisition;
After S4, ARM embedded system receives full spectral information, in conjunction with the calibration curve prestored, calculate the component content of determinand according to langbobier law.
Further, described step S2, it is specially:
Emergent ray is imported to be irradiated to after slit carries out spatial filtering on collimation concave mirror and carry out collimating and then obtaining parallel rays, parallel rays is irradiated to the enterprising circumstances in which people get things ready for a trip of plane grating and falls apart, and is irradiated on ccd detector and detects after the light arrival focusing concave mirror after dispersion focuses on.
The invention has the beneficial effects as follows: a kind of full spectrometer for detecting food fast of the present invention, comprise ARM embedded system, power stabilization circuit, wideband light source, lighting fiber, measuring optical fiber, ccd detector, signal acquisition circuit, fixed grating is adopted to carry out the full spectrum light splitting optical path of light splitting and the sample cell for placing solution to be measured, ARM embedded system is also connected with pin-saving chip and display module, full spectrometer of the present invention have employed fixed grating and carries out the mode that light splitting carries out in conjunction with ccd detector detecting, not only small volume, compact conformation, be convenient for carrying, and measure accurately.
Another beneficial effect of the present invention is: the detection method of a kind of full spectrometer for detecting food fast of the present invention, the incident ray sent by wideband light source is irradiated to solution place to be measured and is obtained emergent ray by after solvent portions absorption to be measured, then emergent ray is imported to be irradiated on ccd detector after a full spectrum point optical circuit carries out light splitting and detect, and then the detection data of ccd detector are sent to signal acquisition circuit carry out processing the full spectral information of rear acquisition, after last embedded system receives full spectral information, in conjunction with the calibration curve prestored, the component content of determinand is calculated according to langbobier law, can be convenient and swift and accurately detect.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the structured flowchart of a kind of full spectrometer for detecting food fast of the present invention;
Fig. 2 is the structural drawing of the full spectrum light splitting optical path of a kind of full spectrometer for detecting food fast of the present invention;
Fig. 3 is the process flow diagram of the detection method of a kind of full spectrometer for detecting food fast of the present invention;
Fig. 4 is the schematic flow sheet that the full spectrometer of a specific embodiment of the present invention carries out upgrading.
Embodiment
With reference to Fig. 1, the invention provides a kind of full spectrometer for detecting food fast, comprising ARM embedded system 1, power stabilization circuit 2, wideband light source 3, lighting fiber 4, measuring optical fiber 6, ccd detector 8, signal acquisition circuit 9, adopting fixed grating to carry out the full spectrum light splitting optical path 7 of light splitting and the sample cell 5 for placing solution to be measured;
The output terminal of described ARM embedded system 1 successively with power stabilization circuit 2, wideband light source 3 and lighting fiber 4 connect, the incident ray that described wideband light source 3 sends is irradiated to the solution place to be measured in sample cell 5 by lighting fiber 4 and obtains emergent ray after being absorbed by solvent portions to be measured, emergent ray is imported to after full spectrum light splitting optical path 7 carries out light splitting by measuring optical fiber 6 and is irradiated to ccd detector 8, emergent ray after ccd detector 8 pairs of light splitting detects and detection data is sent to signal acquisition circuit 9, obtain full spectral information after signal acquisition circuit 9 pairs of measurement data process and be sent to ARM embedded system 1,
Described ARM embedded system 1 is also connected with pin-saving chip 10 and display module 11.
Be further used as preferred embodiment, with reference to Fig. 2, described full spectrum light splitting optical path 7 comprises slit 201, collimation concave mirror 202, plane grating 203 and focusing concave mirror 204, be irradiated to after the emergent ray that described measuring optical fiber 6 imports carries out spatial filtering by slit 201 on collimation concave mirror 202 and carry out collimating and then obtaining parallel rays, parallel rays is irradiated to the enterprising circumstances in which people get things ready for a trip of plane grating 203 and falls apart, and the light after dispersion arrives after focusing concave mirror 204 focuses on and is irradiated on ccd detector 8.
Be further used as preferred embodiment, the width range of described slit 201 is 5 μm ~ 100 μm, collimation concave mirror 202 all adopts spherical reflector of aluminizing with focusing concave mirror 204, and plane grating 203 adopts linear density range to be the blazed grating of the sawtooth grooved of 300 lines/mm ~ 1200 line/mm.
Be further used as preferred embodiment, described power stabilization circuit 2 adopts constant voltage circuit.
Be further used as preferred embodiment, described sample cell 5 adopts light path to be the quartz colorimetric utensil of 10mm.
Be further used as preferred embodiment, described lighting fiber 4 and measuring optical fiber 6 all adopt doped fused silica multimode optical fiber, and the core diameter scope of optical fiber is 50 μm ~ 1000 μm, and fibre-optic package interface is SMA905.
Be further used as preferred embodiment, described ccd detector 8 adopts the linear array detector of 3648 × 1 pixels and pixel size is 8 × 200 μm.
Be further used as preferred embodiment, it is one or more that described ARM embedded system 1 is also connected in expansion interface 12, printing device 13, Ethernet wired module 14, Wi-Fi wireless module 15 and GSM/GPRS wireless module 16.
With reference to Fig. 3, present invention also offers a kind of detection method of the full spectrometer for detecting food fast, comprising:
S1, the incident ray that wideband light source 3 sends is irradiated to solution place to be measured and obtains emergent ray after being absorbed by solvent portions to be measured;
S2, emergent ray imported to be irradiated on ccd detector 8 after a full spectrum point optical circuit 7 carries out light splitting and detect;
S3, the detection data of ccd detector 8 are sent to signal acquisition circuit 9 carry out processing the full spectral information of rear acquisition;
After S4, ARM embedded system 1 receives full spectral information, in conjunction with the calibration curve prestored, calculate the component content of determinand according to langbobier law.
Be further used as preferred embodiment, described step S2, it is specially:
Emergent ray is imported to be irradiated to after slit 201 carries out spatial filtering on collimation concave mirror 202 and carry out collimating and then obtaining parallel rays, parallel rays is irradiated to the enterprising circumstances in which people get things ready for a trip of plane grating 203 and falls apart, and is irradiated on ccd detector 8 and detects after the light arrival focusing concave mirror 204 after dispersion focuses on.
Below in conjunction with embodiment, the present invention will be further described.
With reference to Fig. 1 and Fig. 2, a specific embodiment of the present invention is as follows: a kind of full spectrometer for detecting food fast, comprising ARM embedded system 1, power stabilization circuit 2, wideband light source 3, lighting fiber 4, measuring optical fiber 6, ccd detector 8, signal acquisition circuit 9, adopting fixed grating to carry out the full spectrum light splitting optical path 7 of light splitting and the sample cell 5 for placing solution to be measured;
The output terminal of ARM embedded system 1 successively with power stabilization circuit 2, wideband light source 3 and lighting fiber 4 connect, the incident ray that wideband light source 3 sends is irradiated to the solution place to be measured in sample cell 5 by lighting fiber 4 and obtains emergent ray after being absorbed by solvent portions to be measured, emergent ray is imported to after full spectrum light splitting optical path 7 carries out light splitting by measuring optical fiber 6 and is irradiated to ccd detector 8, emergent ray after ccd detector 8 pairs of light splitting detects and detection data is sent to signal acquisition circuit 9, obtain full spectral information after signal acquisition circuit 9 pairs of measurement data process and be sent to ARM embedded system 1,
ARM embedded system 1 is also connected with pin-saving chip 10 and display module 11.
The full spectrum light splitting optical path 7 of the present embodiment comprises slit 201, collimation concave mirror 202, plane grating 203 and focusing concave mirror 204, be irradiated to after the emergent ray that measuring optical fiber 6 imports carries out spatial filtering by slit 201 on collimation concave mirror 202 and carry out collimating and then obtaining parallel rays, parallel rays is irradiated to the enterprising circumstances in which people get things ready for a trip of plane grating 203 and falls apart, and the light after dispersion arrives after focusing concave mirror 204 focuses on and is irradiated on ccd detector 8.Preferably, the width range of slit 201 is 5 μm ~ 100 μm, and collimation concave mirror 202 all adopts spherical reflector of aluminizing with focusing concave mirror 204, and plane grating 203 adopts linear density range to be the blazed grating of the sawtooth grooved of 300 lines/mm ~ 1200 line/mm.
Here parallel rays is irradiated to that the enterprising circumstances in which people get things ready for a trip of plane grating 203 are loose to be referred to, the multi-wavelength parallel beam be irradiated on it is carried out dispersion by plane grating 203, and the first-order diffraction of different wavelengths of light has different space shooting angles.And then each wavelength light beam after dispersion focuses on the diverse location of ccd detector 8 after focusing concave mirror 204 focuses on.
The advantage of full spectrum light splitting optical path 7 is: based on wideband light source 3, what full spectrum light splitting optical path 7 obtained is continuous print all band spectral information, therefore the wavelength that common colourimetry is measured all can cover, therefore the solution to be measured that the sample that this full spectrometer can detect different wavelength range is made.When needing to detect new test item, as long as its determined wavelength is in the spectral range of wideband light source 3, can test, or only need directly to increase new test item in detection method database by software upgrading mode, corresponding operation indicating can be provided to guide user to detect, and upgrading is convenient.And the formation of full spectrum light splitting optical path 7 determines it and can adopt all solid state design, does not have moving component, compact conformation, and strong interference immunity, is applicable to on-site rapid measurement.Further, the measuring accuracy of this light path is high, because the spectral resolution of grating beam splitting is higher, and plane grating flexible design, by optimizing zero order reflection and the parasitic light of erasure signal light, signal to noise ratio (S/N ratio) is good; And full spectral information can provide bias light measurement data more accurately, comprehensive above-mentioned known light path has very high measuring accuracy.In addition, this light path is also content with very little the various customized demand of user, when user need customized expand to ultraviolet, near-infrared band time, can realize by changing plane grating, and change without the need to carrying out other to instrument.
ARM embedded system 1 specifically can adopt the ARM chip based on Cortex M3/M4 framework or Cortex A8/A9 structure, and its operating system can adopt WinCE, μ C/OS-II, Android etc., and the software interface of full spectrometer adopts C Plus Plus exploitation.
Pin-saving chip 10, for storing the testing result of sample, also may be used for storing detection method database.Pin-saving chip 10 adopts EEPROM (Electrically Erasable Programmable Read Only Memo) EEPROM, and its amount of capacity can be determined according to the size of the storage Data Entry of full spectrometer and detection method database.Operation when detection method in detection method database is detection is guided, when user detects, first select and call corresponding detection method, now display module 11 can show corresponding operation indicating, user carries out testing according to operation indicating, thus makes the operation of this full spectrometer more convenient.
In the present embodiment, display module 11 adopts LCD touch display screen, can adopt 7 cun of full color displays and four-line resistive touch screen split.
Wideband light source 3 is generally select according to the determined wavelength scope of full spectrometer, when measurement range is conventional visible light wave range, adopts halogen tungsten lamp light source.
Power stabilization circuit 2 adopts constant voltage circuit, generally adopts the constant voltage circuit be made up of voltage stabilizing chip, operational amplifier and power amplification metal-oxide-semiconductor, and the structure of constant voltage circuit is current comparatively proven technique, is not therefore described in detail here.
Sample cell 5 adopts light path to be the quartz colorimetric utensil of 10mm.
Lighting fiber 4 and measuring optical fiber 6 all adopt doped fused silica multimode optical fiber, and the core diameter scope of optical fiber is 50 μm ~ 1000 μm, and fibre-optic package interface is SMA905.
Ccd detector 8 adopts the linear array detector of 3648 × 1 pixels and pixel size is 8 × 200 μm, and image planes length is 29.2mm.
Signal acquisition circuit 9 can adopt on-site programmable gate array FPGA, as long as be loaded with the correlation formula of colorimetry calculating, can calculate obtain full spectral information according to the detection data of ccd detector 8.
After the full spectral information that ARM embedded system 1 Received signal strength Acquisition Circuit 9 sends, in conjunction with the calibration curve prestored, calculate the component content of determinand according to langbobier law.The full spectral information obtained in testing result and testing process can show in real time on display module 11, is automatically stored on pin-saving chip 10 simultaneously.Full spectral information is shown as spectrogram on display module 11.
In the present embodiment, ARM embedded system 1 is also connected to expansion interface 12, printing device 13, Ethernet wired module 14, Wi-Fi wireless module 15 and GSM/GPRS wireless module 16.
Expansion interface 12 comprises USB interface and SD card interface, and wherein USB interface can be used for connecting computer and carries out data transmission, and also may be used for inserting the peripheral hardware such as USB flash disk, USB mouse, USB keyboard, SD card interface is for inserting outside SD storage card.
Ethernet wired module 14 follows ICP/IP protocol, and Wi-Fi wireless module 15 meets IEEE802.11b/g standard and frequency is 2.4GHz, GSM/GPRS wireless module 16 adopts 900MHz/1800MHz double frequency communication modes.Ethernet wired module 14, Wi-Fi wireless module 15 and GSM/GPRS wireless module 16 adopt the form such as SPI interface, RS232 interface and ARM embedded system 1 to carry out communication.
The full spectral information obtained in testing result and testing process can be sent on external memory storage, external computer or server by expansion interface 12 by ARM embedded system 1, also can be sent to printing device 13 and print.And, can also testing result be sent to the server of foods supervision department by Ethernet wired module 14, Wi-Fi wireless module 15 or GSM/GPRS wireless module 16 and feed back to relevant staff in time, thus improve the efficiency of foods supervision.
With reference to shown in Fig. 4, when the testing result of full spectrometer needs to upload, first can judge whether cable network, Wi-Fi or GPRS network are communicated with successively respectively by Ethernet wired module 14, Wi-Fi wireless module 15 or GSM/GPRS wireless module 16, if wherein there is one to be communicated with, then attempt connecting login remote server by this network, by data upload to server, and can be issued to the relevant personnel by server after successful connection.If network is obstructed or login remote server failure, can automatically jump to direct connection pattern, with the GSM function in GSM/GPRS wireless module 16 directly to the staff prestored in full spectrometer phone number send data, data upload can wait until network unimpeded after upload or export to the computer with Ethernet after upload.This mode can guarantee the ageing and reliability that food safety monitoring data are transmitted.
When the test item of this full spectrometer needs to upgrade, upgrade file can be downloaded in USB flash disk or SD card, then insert expansion interface 12 import thus carry out local upgrade, also can connect upgrade server by Ethernet wired module 14, Wi-Fi wireless module 15 or GSM/GPRS wireless module 16 and carry out network upgrade.
More than that better enforcement of the present invention is illustrated, but the invention is not limited to embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent modification or replacement are all included in the application's claim limited range.
Claims (3)
1. one kind for detecting the full spectrometer of food fast, it is characterized in that, comprising ARM embedded system (1), power stabilization circuit (2), wideband light source (3), lighting fiber (4), measuring optical fiber (6), ccd detector (8), signal acquisition circuit (9), adopting fixed grating to carry out the full spectrum light splitting optical path (7) of light splitting and the sample cell (5) for placing solution to be measured;
The output terminal of described ARM embedded system (1) successively with power stabilization circuit (2), wideband light source (3) and lighting fiber (4) connect, the incident ray that described wideband light source (3) sends is irradiated to the solution place to be measured in sample cell (5) by lighting fiber (4) and obtains emergent ray after being absorbed by solvent portions to be measured, emergent ray imports to entirely to compose after light splitting optical path (7) carries out light splitting by measuring optical fiber (6) and is irradiated to ccd detector (8), ccd detector (8) detects the emergent ray after light splitting and detection data is sent to signal acquisition circuit (9), obtain full spectral information after signal acquisition circuit (9) processes measurement data and be sent to ARM embedded system (1),
Described ARM embedded system (1) is also connected with pin-saving chip (10) and display module (11); Described full spectrum light splitting optical path (7) comprises slit (201), collimation concave mirror (202), plane grating (203) and focusing concave mirror (204), the emergent ray that described measuring optical fiber (6) imports is irradiated to after carrying out spatial filtering by slit (201) on collimation concave mirror (202) and carries out collimating and then obtaining parallel rays, parallel rays is irradiated to plane grating (203) the enterprising circumstances in which people get things ready for a trip and falls apart, and the light after dispersion arrives after focusing concave mirror (204) focuses on and is irradiated on ccd detector (8);
The width range of described slit (201) is 5 μm ~ 100 μm, described collimation concave mirror (202) and focusing concave mirror (204) all adopt spherical reflector of aluminizing, and described plane grating (203) employing linear density range is the blazed grating of the sawtooth grooved of 300 lines/mm ~ 1200 line/mm;
Described power stabilization circuit (2) adopts constant voltage circuit;
Described sample cell (5) adopts light path to be the quartz colorimetric utensil of 10mm;
Described lighting fiber (4) and measuring optical fiber (6) all adopt doped fused silica multimode optical fiber, and the core diameter scope of optical fiber is 50 μm ~ 1000 μm, and fibre-optic package interface is SMA905;
Described ccd detector (8) adopts the linear array detector of 3648 × 1 pixels and pixel size is 8 × 200 μm;
It is one or more that described ARM embedded system (1) is also connected in expansion interface (12), printing device (13), Ethernet wired module (14), Wi-Fi wireless module (15) and GSM/GPRS wireless module (16).
2. a detection method for full spectrometer as claimed in claim 1, is characterized in that, comprising:
S1, the incident ray that wideband light source (3) sends is irradiated to solution place to be measured and obtains emergent ray after being absorbed by solvent portions to be measured;
S2, emergent ray imported to entirely compose to be irradiated on ccd detector (8) after light splitting optical path (7) carries out light splitting and detect;
S3, the detection data of ccd detector (8) are sent to signal acquisition circuit (9) carry out processing the full spectral information of rear acquisition;
After S4, ARM embedded system (1) receives full spectral information, in conjunction with the calibration curve prestored, calculate the component content of determinand according to langbobier law.
3. detection method according to claim 2, it is characterized in that, described step S2, it is specially: imported to by emergent ray to be irradiated to after slit (201) carries out spatial filtering on collimation concave mirror (202) and carry out collimating and then obtaining parallel rays, parallel rays is irradiated to plane grating (203) the enterprising circumstances in which people get things ready for a trip and falls apart, and is irradiated on ccd detector (8) and detects after light arrival focusing concave mirror (204) after dispersion focuses on.
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