CN116539543A - Discrete spectrum food baking degree detection method - Google Patents

Discrete spectrum food baking degree detection method Download PDF

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Publication number
CN116539543A
CN116539543A CN202310396780.5A CN202310396780A CN116539543A CN 116539543 A CN116539543 A CN 116539543A CN 202310396780 A CN202310396780 A CN 202310396780A CN 116539543 A CN116539543 A CN 116539543A
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light
photoelectric sensor
spectrum
light path
sample
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高丽玲
黄南通
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Dongguan Terminal Precision Electromechanical Co ltd
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Dongguan Terminal Precision Electromechanical Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The invention discloses a discrete spectrum food baking degree detection method, which comprises the following steps of S1, placing a sample to be detected in a completely black environment for multi-channel irradiation and collection, wherein a luminous source irradiates the sample through light path channels, and as the spectrum wavelengths of the light path channels are different, a discrete spectrum is formed, and a photoelectric sensor is utilized to collect light signals reflected by the light path channels irradiating the sample; s2, outputting a voltage signal through an amplifier after the photoelectric sensor detects the light intensity; s3, the photoelectric sensor respectively collects light signals with different spectrum wavelengths at different temperatures, temperature compensation is carried out on numerical errors of the same sample at different temperatures, and the relation among temperature, voltage or AD numerical values converted by an ADC (analog-to-digital converter) and baking degree numerical values is fitted through a multi-element least square method; the invention has the advantages of multispectral precision and stability, simultaneously can reduce the cost, improve the portability and better improve the baking degree detection effect.

Description

Discrete spectrum food baking degree detection method
Technical Field
The invention relates to the technical field of food baking detection, in particular to a discrete spectrum food baking degree detection method.
Background
The baking degree is a parameter for detecting the baking degree of food, is a parameter originally created by Agtron corporation, is often used for detecting the baking degree of food, such as cereal baking, bread baking, bean baking and the like, and is mainly used for detecting the baking degree in the food processing process.
At present, the field has two problems, namely, the 1 st is that the cost of a machine is too high due to continuous spectrum detection, the machine mainly adopts a multispectral means (a continuous spectrum method such as a grating spectrometer) to detect by adopting continuous spectrum, and the hardware investment of the machine in the detection process is too high due to the occurrence and detection of continuous spectrum accompanied by high-cost sensor cost, so that the manufacturing cost is too high, and the current desktop adopts a multispectral continuous spectrum detection method, mainly adopts white light grating light splitting and adopts an integrating sphere to measure; the 2 nd is portable baking degree detector, adopts the mode of infrared spectrum to detect, and single spectrum easily causes the great error of appearance when light-colored detection, and portable baking degree check out test set all adopts the infrared 850nm wavelength of single light source to detect at present.
Since the use of multi-spectral detection can well solve this problem, the present invention uses discrete spectra, i.e., detection using light of multiple colors.
Disclosure of Invention
The invention provides a technical scheme capable of solving the problems in order to overcome the defects of the prior art.
A discrete spectrum food baking degree detection method, comprising the following steps:
s1, placing a sample to be measured in a completely black environment for multi-channel irradiation and collection, wherein a light-emitting source is arranged in the sample, and the light-emitting source irradiates the sample through light path channels, and as the spectrum wavelengths of the light path channels are different, a discrete spectrum is formed, and a photoelectric sensor is used for collecting light signals reflected by the sample irradiated by the light path channels;
s2, outputting a voltage signal through an amplifier after the photoelectric sensor detects the light intensity, converting the voltage signal into a digital signal through an ADC, and storing the digital signal in a register;
and S3, respectively acquiring light signals with different spectral wavelengths by the photoelectric sensor at different temperatures, measuring the numerical error of the same sample at different temperatures, compensating the numerical error to a certain fixed temperature, and realizing the accuracy of measuring the same sample at different environmental temperatures by fitting the relation among temperature, voltage or AD (analog-to-digital) value converted by the ADC (analog-to-digital converter) and baking degree value by a multi-element least square method.
Further, the following formula is satisfied in step S3:
the formula is that under different environmental temperatures, the photoelectric sensor detects different samples to obtain different voltage signals or AD signals, and a calculation matrix is formed;
wherein: v represents the value detected by the photoelectric sensor, and the value is preferably a voltage value or an AD value of a digital signal; t represents real-time ambient temperature; a-f represent coefficients in a multiple fitting formula; ag represents a unit representation of the extent of baking.
Furthermore, the luminous sources are arranged in each light path channel, the light path channels are provided with more than two luminous sources, each luminous source adopts a single color, each luminous source emits light rays from ultraviolet to infrared, the spectrum wavelength of each luminous source is between 250nm and 1500nm, and each light path channel is collected in a time-sharing mode.
Further, the three light path channels are arranged, the spectral wavelengths of the light emitting sources arranged in the light path channels are respectively 520nm, 650nm and 850nm, the light emitting sources in the light path channels are firstly irradiated to a sample by utilizing monochromatic light of 520nm during time-sharing acquisition, stable signal data are acquired through the photoelectric sensor and stored in the register, then the light emitting sources of the light path channels are closed, the light emitting sources in the light path channels are respectively acquired by utilizing monochromatic light of 650nm and monochromatic light of 850nm, and only the light emitting sources in the single light path channels are opened during each data acquisition.
Furthermore, a full spectrum white light LED is arranged in a full black environment and is used as a light emitting source, the full spectrum white light LED contains a plurality of white LEDs with spectrum wavelengths continuously, a narrow-band filter is arranged on the light emitting source to separate light rays with different colors and irradiate the light rays into each light path channel, and a photoelectric sensor collects stable data and stores the data into a register.
Furthermore, a dimming system is arranged in the light path channel, and the dimming system adopts any one of a pwm dimming system and an amplifying circuit.
Further, the voltage or the AD value signal converted by the ADC is fitted to the normalized Agtron value.
Further, the photoelectric sensor, the register and the luminous sources in the light path channels are electrically connected with each other, and the MCU master controller is used for controlling the photoelectric sensor, the register and the luminous sources to work respectively.
Further, the photo sensor is preferably a photodiode, and the photo sensor may be any one of a phototransistor, a CMOS, and a CCD.
In step S1, an optical filter is installed in the optical path channel, and the light source performs spectral wavelength control through the optical filter.
Compared with the prior art, the invention has the beneficial effects that: discrete multiple colors can be adopted, for example, two colors or three or more colors of light sources are adopted for detection, the multi-spectrum precision and stability are achieved, meanwhile, the cost can be reduced, the portability is improved, and the baking degree detection effect can be improved better.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of the roasting degree detection principle of the present invention;
FIG. 2 is a schematic representation of the invention when using 5 wavelengths for detection;
FIG. 3 is a schematic diagram of the formulas satisfied by the present invention.
Description of the embodiments
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown.
The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 to 3, a discrete spectrum food baking degree detection method of the present invention includes the steps of:
s1, placing a sample to be measured in a completely black environment for multi-channel irradiation and collection, wherein a light-emitting source is arranged in the sample, and the light-emitting source irradiates the sample through light path channels, and as the spectrum wavelengths of the light path channels are different, a discrete spectrum is formed, and a photoelectric sensor is used for collecting light signals reflected by the sample irradiated by the light path channels;
s2, outputting a voltage signal through an amplifier after the photoelectric sensor detects the light intensity, converting the voltage signal into a digital signal through an ADC, and storing the digital signal in a register;
and S3, respectively acquiring light signals with different spectral wavelengths by the photoelectric sensor at different temperatures, measuring the numerical error of the same sample at different temperatures, compensating the numerical error to a certain fixed temperature, and realizing the accuracy of measuring the same sample at different environmental temperatures by fitting the relation among temperature, voltage or AD (analog-to-digital) value converted by the ADC (analog-to-digital converter) and baking degree value by a multi-element least square method.
Further, the following formula is satisfied in step S3:
the formula is that under different environmental temperatures, the photoelectric sensor detects different samples to obtain different voltage signals or AD signals, and a calculation matrix is formed;
wherein: v represents the value detected by the photoelectric sensor, and the value is preferably a voltage value or an AD value of a digital signal; t represents real-time ambient temperature; a-f represent coefficients in a multiple fitting formula; ag represents a unit representation of the extent of baking.
Furthermore, the luminous sources are arranged in each light path channel, the light path channels are provided with more than two luminous sources, each luminous source adopts a single color, each luminous source emits light rays from ultraviolet to infrared, the spectrum wavelength of each luminous source is between 250nm and 1500nm, and each light path channel is collected in a time-sharing mode.
Further, the three light path channels are arranged, the spectral wavelengths of the light emitting sources arranged in the light path channels are respectively 520nm, 650nm and 850nm, the light emitting sources in the light path channels are firstly irradiated to a sample by utilizing monochromatic light of 520nm during time-sharing acquisition, stable signal data are acquired through the photoelectric sensor and stored in the register, then the light emitting sources of the light path channels are closed, the light emitting sources in the light path channels are respectively acquired by utilizing monochromatic light of 650nm and monochromatic light of 850nm, and only the light emitting sources in the single light path channels are opened during each data acquisition.
Furthermore, a full spectrum white light LED is arranged in a full black environment and is used as a light emitting source, the full spectrum white light LED contains a plurality of white LEDs with spectrum wavelengths continuously, a narrow-band filter is arranged on the light emitting source to separate light rays with different colors and irradiate the light rays into each light path channel, and a photoelectric sensor collects stable data and stores the data into a register.
Furthermore, a dimming system is arranged in the light path channel, and the dimming system adopts any one of a pwm dimming system and an amplifying circuit.
Further, the voltage or the AD numerical signal converted by the ADC is mutually fitted with the standardized Agtron numerical value, so that the relation between the signal of the measured sample and the actual baking degree numerical value is realized.
Further, the photoelectric sensor, the register and the luminous sources in the light path channels are electrically connected with each other, and the MCU master controller is used for controlling the photoelectric sensor, the register and the luminous sources to work respectively.
Further, the photo sensor is preferably a photodiode, and the photo sensor may be any one of a phototransistor, a CMOS, and a CCD.
In step S1, an optical filter is installed in the optical path channel, and the light source performs spectral wavelength control through the optical filter.
The invention can adopt discrete multiple colors, for example, two colors or three or more colors of luminous sources for detection, has the precision and stability of multispectral, and can also reduce the cost and improve the portability; the baking degree detection effect can be better improved; the invention adopts the following two technical schemes, namely, firstly, more than one LED or other luminous sources for irradiating light rays (250 nm-1500 nm) from ultraviolet rays to infrared rays are used for carrying out single color irradiation, then the light rays are acquired in a time-sharing mode, photoelectric sensors (photodiodes, phototriodes, CMOS, CCD and the like) are used for carrying out the acquisition, secondly, the light rays with fixed wavelength are irradiated through a full spectrum white light source, and a photoelectric sensor matrix and a narrow-band optical filter covered in front of the photoelectric sensors are used for realizing the measurement.
Because the photoelectric sensor is very sensitive to light, in the process of measuring in a dark environment, the problem of device installation and measurement operation can be unavoidable, so that the ambient light influences the normal measuring process, and therefore, the invention also needs a scheme for eliminating the ambient light based on the method, and the actual effect of eliminating the ambient light is realized by subtracting the measurement before and after the measuring process.
The ambient light elimination is mainly divided into three stages, wherein the first stage is to drive a photoelectric sensor to measure ambient light before measurement, and no light source irradiates at the moment to obtain a measurement result, and the measurement result is recorded as L1; in the second stage, the light-emitting source and the photoelectric sensor are driven to respectively measure and collect multiple channels, wherein a single channel is taken as an example, and the multiple channels can be used for measurement and recorded as L2; a third stage, measuring again by using the method of the first stage to obtain L3; finally, by comparing the difference between L1 and L3, whether the ambient light interference exists or not can be obtained, and when the ambient light interference exists, the difference is subtracted by using L2.
Examples
The light reflection is carried out by using three light sources, the light sources can select LEDs with better monochromaticity, such as a wavelength range of 850nm plus or minus 10nm (a wider wavelength range can be used and can be controlled by adding a filter), light rays with three colors of wavelengths are selected, for example, three monochromatic lights of 520nm, 650m and 850nm are selected, and a sample to be detected is irradiated and collected in a black environment; specifically, 520nm monochromatic light is firstly irradiated onto a target sample, a photoelectric sensor is used for collecting simultaneously, a stable signal is obtained, then the channel is collected, the collected signal is stored in a register, then a light-emitting source of the light path channel is closed, a 650nm channel is started for irradiation, the collection operation is still carried out according to the mode until the signals of all the channels are completely collected, and as the photoelectric sensor can be used for detecting the light intensity at the time, a voltage signal is output through an amplifier, and the voltage signal is converted into a digital signal through an ADC (analog-to-digital converter) and is stored in the register.
Examples
The invention uses full-light harmonic white light LED as a light source, the full-light harmonic white light is a white LED with continuous multiple wavelengths, various wavelengths are emitted, similar to the irradiation of a big sunlight line, but how to separate various spectrums is a difficult problem, so the invention separates different color lights through a narrow-band filter, can directly irradiate a sample through the white light, then reflected lights can be received through a plurality of (more than 3) photoelectric sensors with the narrow-band filter, and the received light signals can be converted into voltage signals through a cross-group amplifier, and are converted into digital quantity signals through an ADC (analog-digital converter) to be stored in a storage.
It is known that the same optical harmonic length is different for the reflectivity of the same detection object, and thus the situation that the detection signal is too small or too large occurs; therefore, for the two embodiments, the invention adopts the dimming system to adjust the collected signals to the optimal state, uses PWM to realize the dimming of the luminous source, and then uses the amplifying circuit arranged behind the photoelectric sensor to realize the optimal light path collection, and assumes that the signal range received by the ADC is 0-3.3V, but the collected photoelectric signal is 10mV-300mV, the conclusion is obviously too small, and the amplification factor of each path can be ensured to be proper by adjusting the amplifying circuit, but the consistency of the luminous source and the photoelectric sensor is not very good, so the invention controls the amplification factor within a reasonable range by finely adjusting the light of the luminous source through the dimming system.
The prior Agtron has a set of baking degree standard, is a series of AGTRON values, obtains different voltage values by detecting samples of different AGTRON values at different wavelengths, and then fits with the prior Agtron values at different wavelengths and different voltages.
In addition, temperature has a great influence on measurement of the photoelectric sensor, so that temperature compensation is required to be carried out according to different values of measurement of different temperatures in the measurement process, and the values are compensated at a certain temperature, for example, the temperature is compensated at room temperature; the specific operation mode is that the measurement results of samples with the same baking degree and different wavelengths at different temperatures are measured, the relationship between the temperature and the voltage is fitted through a least square method, and then the relationship between the voltage and the wavelength is fitted for the second time; of course other temperature compensation algorithms may be used and still be utilized in the present invention.
Examples
Firstly, driving a plurality of light-emitting sources by a PWM dimming system or other dimming methods, further generating light rays with different spectrum wavelengths, detecting by using 5 paths of light rays, and irradiating a sample by using different discrete wavelengths by using 5 paths of light rays; PWM dimming is mainly used for adjusting the intensity of light so as to avoid the condition that a photoelectric sensor is saturated or weak signals cannot be read, and then five paths of light-emitting sources are driven in a time-sharing mode to irradiate a sample, and meanwhile the photoelectric sensor receives the samples irradiated by light rays with different wavelengths; the photoelectric sensor converts the signal into a digital quantity signal through an AFE front end or amplifies the signal through a transimpedance amplifier, and the digital quantity signal is converted into a digital quantity signal through an ADC and is received by a main controller such as an MCU.
In order to accurately measure Agtron values, the invention can carry out temperature compensation measurement at different temperatures, and the specific operation is as follows: assuming that the working temperature of the device is 0-60 ℃, seven temperatures of T1-T7 are set in the invention, a constant temperature and humidity box is used as a full black measuring environment, different wavelengths (five wavelengths are used here) are used for measuring calibration plates or calibration objects with different Agtron values at seven temperatures respectively, a color chart is used in the embodiment, the color chart is selected for measurement because the color of the color chart is stable and traceable, then different color charts are used for measuring certain values through an Actron standard machine, and the voltage values and the temperatures measured in the n different wave bands are put into a matrix to calculate a group of parameters which can be used as parameters of the whole formula and written into an MCU for calculation.
The present embodiment is not limited in any way by the shape, material, structure, etc. of the present invention, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention are all included in the scope of protection of the technical solution of the present invention.

Claims (10)

1. The discrete spectrum food baking degree detection method is characterized by comprising the following steps of:
s1, placing a sample to be measured in a completely black environment for multi-channel irradiation and collection, wherein a light-emitting source is arranged in the sample, and the light-emitting source irradiates the sample through light path channels, and as the spectrum wavelengths of the light path channels are different, a discrete spectrum is formed, and a photoelectric sensor is used for collecting light signals reflected by the sample irradiated by the light path channels;
s2, outputting a voltage signal through an amplifier after the photoelectric sensor detects the light intensity, converting the voltage signal into a digital signal through an ADC, and storing the digital signal in a register;
and S3, respectively acquiring light signals with different spectral wavelengths by the photoelectric sensor at different temperatures, measuring the numerical error of the same sample at different temperatures, compensating the numerical error to a certain fixed temperature, and realizing the accuracy of measuring the same sample at different environmental temperatures by fitting the relation among temperature, voltage or AD (analog-to-digital) value converted by the ADC (analog-to-digital converter) and baking degree value by a multi-element least square method.
2. The method according to claim 1, wherein the following formula is satisfied in step S3:
the formula is that under different environmental temperatures, the photoelectric sensor detects different samples to obtain different voltage signals or AD signals, and a calculation matrix is formed;
wherein: v represents the value detected by the photoelectric sensor, and the value is preferably a voltage value or an AD value of a digital signal; t represents real-time ambient temperature; a-f represent coefficients in a multiple fitting formula; ag represents a unit representation of the extent of baking.
3. The method for detecting the baking degree of the discrete spectrum food according to claim 1, wherein the light-emitting sources are arranged in each light path channel, the light path channels are provided with more than two light-emitting sources, each light-emitting source adopts a single color, each light-emitting source emits light rays from ultraviolet to infrared, the spectrum wavelength of each light-emitting source is between 250nm and 1500nm, and the light path channels are collected in a time-sharing mode.
4. The method for detecting the baking degree of discrete spectrum foods according to claim 3, wherein three light path channels are arranged, the spectral wavelengths of the light emitting sources arranged in the light path channels are respectively 520nm, 650nm and 850nm, when the time-sharing acquisition is carried out, firstly, 520nm monochromatic light is used for irradiating a sample, the sample is acquired through a photoelectric sensor, stable signal data are obtained and then stored in a register, then, the light emitting sources of the light path channels are closed, the light emitting sources of 650nm monochromatic light and 850nm monochromatic light are respectively used for acquiring, and only the light emitting sources in the single light path channel are turned on when the data are acquired each time.
5. The method for detecting the baking degree of discrete spectrum foods according to claim 1, wherein a full-spectrum white light LED is installed in a full-black environment as a light-emitting source, the full-spectrum white light LED contains white LEDs with a plurality of continuous spectrum wavelengths, a narrow-band filter is installed on the light-emitting source to separate light rays with different colors and irradiate the light rays into each light path channel, and a photoelectric sensor collects stable data and stores the stable data into a register.
6. The method for detecting the baking degree of the discrete spectrum food according to claim 1, wherein a light modulation system is arranged in the light path channel, and the light modulation system adopts any one of a pwm light modulation system and an amplifying circuit.
7. A method of discrete-spectrum food baking level detection according to claim 1, wherein the voltage or the AD value signal converted by the ADC is fitted to the standardized Agtron value.
8. The method for detecting the baking degree of the food in the discrete spectrum according to claim 1, wherein the photoelectric sensor, the register and the light emitting sources in the light path channels are electrically connected and provided with MCU (micro controller unit) controllers, and the MCU controllers respectively control the photoelectric sensor, the register and the light emitting sources to work.
9. The method for detecting the baking degree of the food in the discrete spectrum according to claim 1, wherein the photoelectric sensor is preferably a photodiode, and the photoelectric sensor is any one of a phototransistor, a CMOS and a CCD.
10. The method for detecting the baking degree of a discrete spectrum food according to claim 1, wherein in the step S1, an optical filter is installed in the optical path channel, and the light emitting source performs the spectral wavelength control through the optical filter.
CN202310396780.5A 2023-04-14 2023-04-14 Discrete spectrum food baking degree detection method Pending CN116539543A (en)

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