A color calibration method and system for automotive interior atmosphere lamps based on multi-channel optical fiber synchronous acquisition

Abstract

The present application relates to a kind of automobile interior atmosphere lamp color calibration methods based on multi-channel fiber synchronous acquisition, color calibration is carried out by the measuring system of two-stage calibration, wherein two-stage calibration includes first stage: under the same geometric condition, the same region of the N fiber probes is simultaneously aligned with a uniformity standard light source, the original spectral signal of each channel is synchronously collected, the relative spectral response correction coefficient of each channel relative to reference channel is calculated based on the signal;Second stage: select a standard transfer light source measured, and using any one specified fiber probe calibrated by the first stage, under standard geometric conditions, the standard transfer light source is aligned and collected, to obtain the original signal;Combined with the known absolute spectral radiance value of the standard transfer light source and the corresponding, the absolute spectral responsivity function of the entire system is calculated.The present application can multi-channel synchronous acquisition, and greatly shorten the measurement time.

Description

Technical Field

[0001] This invention relates to the fields of precision optical measurement and industrial automation testing technology, specifically to a method and system for color calibration of automotive interior ambient lighting based on multi-channel fiber optic synchronous acquisition, which is particularly suitable for the one-time synchronous calibration and verification of the color parameters of multi-channel independent LED ambient lighting in automotive interiors. Background Technology

[0002] In the production calibration of automotive interior ambient lighting, it is often necessary to measure each channel of a multi-channel system composed of multiple independent LED beads or light strips. Traditional methods use a single-point fiber optic probe with a motion mechanism to sequentially align and measure each channel, which is inefficient and affects measurement consistency due to repeated positioning errors caused by mechanical movement. Another approach uses multiple spectrometers corresponding to multiple fiber optic channels, but this is costly, and differences between instruments can introduce systematic errors.

[0003] Using a single-fiber-coupled spectrometer for synchronous acquisition can theoretically improve efficiency and avoid differences between instruments. However, this method faces two key technical bottlenecks: 1) The challenge of consistent calibration of multi-channel spectral responses: Due to fiber optic branch losses, fiber core characteristics, and non-uniformity of pixel responses of each detector within the spectrometer, the measurement results of the eight channels for the same light source have inherent differences; 2) The challenge of system-level calibration and traceability: How to unify and accurately trace the measurement results of the eight channels to photometric and colorimetric standards to ensure that the data of each channel meets metrological requirements.

[0004] Existing technologies lack efficient and rigorous integrated solutions for multi-channel consistency calibration and system calibration for this "single spectrometer-multi-fiber probe" architecture, which limits the application of this efficient architecture in high-precision industrial quality inspection. Summary of the Invention

[0005] The purpose of this invention is to at least address one of the shortcomings of the prior art by providing a method and system for color calibration of automotive interior ambient lighting based on multi-channel optical fiber synchronous acquisition.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Specifically, a method for color calibration of automotive interior ambient lighting based on multi-channel optical fiber synchronous acquisition is proposed, including the following:

[0008] Align each light-emitting unit of the target multi-channel ambient light with the corresponding probe of the one-to-many fiber optic cable of the measurement system, and have the probe synchronously acquire the raw signals of each channel corresponding to the light-emitting unit. ;

[0009] For the i-th channel, its true absolute spectral radiance Calculated using the following formula:

[0010] ;

[0011] based on Complete color calibration;

[0012] The measurement system is obtained through two-stage calibration.

[0013] The first stage is multi-channel spectral response consistency calibration, including:

[0014] A uniform standard light source is provided, whose light-emitting surface is uniform in space and angle. Multiple probes of the one-to-many fiber are aligned with the same region of the uniform standard light source under the same geometric conditions. The spectrometer is then activated to synchronously acquire the raw spectral signals of each channel. ;

[0015] Calculate the relative spectral response correction factor for each channel relative to the original reference spectrum signal. :

[0016]

[0017] in, As the reference spectrum original signal, Stored as the system's intrinsic correction matrix;

[0018] The second level involves system-level standard light source calibration, including:

[0019] A standard transmission light source is provided, and any fiber optic probe master that has completed the first-level calibration is aligned with the standard transmission light source according to the geometric conditions.

[0020] Acquire the spectral signal of the standard transmission light source. Obtain the pre-measured absolute spectral radiance value of the standard transfer light source under the specified geometric conditions. ,

[0021] The absolute spectral response function was calculated. as follows,

[0022]

[0023] in, When i takes master The value of .

[0024] Furthermore, specifically,

[0025] The optical fiber is a 1-to-8 splitter fiber, so the value range of i is [1, 8].

[0026] Furthermore, specifically, the original reference spectral signal is the original spectral signal when i is 1. Or the average of the raw spectral signals of all channels.

[0027] Furthermore, the method also includes,

[0028] Using a verification light source with known spectral characteristics, measurements are performed under the same conditions through the measurement system to obtain measurement results. The measurement results are compared with the known corresponding results of the verification light source. If the differences between each channel and the absolute error are both less than the corresponding preset thresholds, the two-level calibration is determined to be passed; otherwise, the two-level calibration is determined to be failed.

[0029] Furthermore, the method also includes sampling preset environmental parameters for the fiber optic probe master at preset intervals, calculating the environmental score at the sampling time based on preset weights, and determining whether there are any abnormal environmental events based on the environmental score. If so, two-level calibration is performed again.

[0030] Furthermore, specifically, determining whether an abnormal environmental event exists based on the environmental score includes:

[0031] Multiple environmental score data groups are obtained by grouping the environmental scores of J consecutive sampling times with a fixed preset number J.

[0032] For two adjacent environmental score data groups, the data in the earlier environmental score data group is mapped to a two-dimensional plane with the sampling sequence number on the horizontal axis and the environmental score on the vertical axis. A two-dimensional curve fitting is performed to obtain a first curve. The first curve is shifted to the right by J units to obtain a second curve. Then, the minimum distance from the data in the later environmental score data group to the second curve is calculated in the two-dimensional plane. The number K of data exceeding the preset distance_threshold in the minimum distance is counted. If K / J is greater than the preset Proportion_threshold, it is determined that there is an environmental abnormal event; otherwise, it is determined that there is no environmental abnormal event.

[0033] This invention also proposes a color calibration system for automotive interior ambient lighting based on multi-channel optical fiber synchronous acquisition, comprising the following:

[0034] The multi-channel synchronous spectral acquisition unit includes a single multi-channel spectrometer and an 8-to-1 fiber optic probe connected to it.

[0035] The two-stage calibration unit includes a uniformity standard light source and a standard transfer light source;

[0036] The probe positioning fixture is used to precisely align eight fiber optic probes to the same area of ​​a uniformity standard light source during calibration.

[0037] The control module is used to execute the steps of the method described above during runtime, thereby completing the two-level calibration of the measurement system and the color calibration of the target multi-channel ambient light.

[0038] Furthermore, specifically, the uniformity standard light source adopts an integrating sphere light source, and a diffuser plate is configured at its exit to ensure the uniformity of spectrum and irradiance within the probe measurement area.

[0039] Furthermore, specifically, the probe positioning fixture uses a three-dimensional adjustable probe fixture to simultaneously fix eight fiber optic probes, ensuring that their distances and angles relative to the light-emitting surface of the uniform standard light source are exactly the same, eliminating differences introduced by geometric factors.

[0040] Furthermore, specifically, the single spectrometer is a spectrometer equipped with multiple independent imported or internal optical spectrometers and detector arrays, which can achieve true hardware synchronous exposure and acquisition of spectral data from eight channels, completely eliminating errors caused by time asynchrony.

[0041] The beneficial effects of this invention are as follows:

[0042] This invention provides a method for color calibration of automotive interior ambient lighting based on multi-channel optical fiber synchronous acquisition.

[0043] 1. High-precision multi-channel synchronous measurement is achieved: Through rigorous two-level calibration, the channel differences caused by fiber optic splitting and detector non-uniformity are fundamentally eliminated, enabling a single spectrometer to achieve measurement consistency comparable to multiple independent spectrometers, while significantly reducing costs.

[0044] 2. Ensures the traceability and absolute accuracy of measurement data: The measurement results of N channels are uniformly traced back to the standard transmission light source and national benchmark through system-level calibration, so that the measurement data of each channel has metrological reliability and meets high-standard quality control requirements.

[0045] 3. Improved calibration efficiency and reliability: N-channel true synchronous acquisition reduces measurement time to 1 / N of traditional serial measurement, where N is the total number of channels obtained by fiber optic splitting. It also avoids repetitive positioning errors and instability caused by mechanical movement, making it particularly suitable for high-speed, high-consistency testing on production lines.

[0046] 4. It provides a complete and operational engineering calibration solution: it defines in detail the calibration light source, fixtures, process and algorithm, enabling this innovative architecture to be transformed from a laboratory concept into stable and reliable industrial testing equipment. Attached Figure Description

[0047] The above and other features of this disclosure will become more apparent from the detailed description of the embodiments shown in conjunction with the accompanying drawings. In the accompanying drawings, the same reference numerals denote the same or similar output voltages. Obviously, the drawings described below are merely some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort. In the drawings:

[0048] Figure 1 This is a schematic diagram of the overall device structure of a multi-channel calibration system in one embodiment of the present invention.

[0049] Figure 2 This is a schematic diagram of the spectrometer waveform, the standard light source waveform, and their compensation calibration results during the second-level calibration of this invention.

[0050] Figure 3 This is a flowchart illustrating the overall process of applying the automotive interior ambient lighting color calibration method based on multi-channel optical fiber synchronous acquisition in an 8-to-1 optical fiber configuration, as proposed in this invention. Detailed Implementation

[0051] The following will provide a clear and complete description of the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of the present invention. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The same reference numerals used throughout the accompanying drawings indicate the same or similar parts.

[0052] Reference Figure 3 Example 1: This invention proposes a method for color calibration of automotive interior ambient lighting based on multi-channel optical fiber synchronous acquisition, comprising the following:

[0053] Align each light-emitting unit of the target multi-channel ambient light with the corresponding probe of the one-to-many fiber optic cable of the measurement system, and have the probe synchronously acquire the raw signals of each channel corresponding to the light-emitting unit. ;

[0054] For the i-th channel, its true absolute spectral radiance Calculated using the following formula:

[0055] ;

[0056] based on Complete color calibration;

[0057] The measurement system is obtained through two-stage calibration.

[0058] The first stage is multi-channel spectral response consistency calibration, including:

[0059] A uniform standard light source is provided, whose light-emitting surface is uniform in space and angle. Multiple probes of the one-to-many fiber are aligned with the same region of the uniform standard light source under the same geometric conditions. The spectrometer is then activated to synchronously acquire the raw spectral signals of each channel. ;

[0060] Calculate the relative spectral response correction factor for each channel relative to the original reference spectrum signal. :

[0061]

[0062] in, As the reference spectrum original signal, Stored as the system's intrinsic correction matrix;

[0063] The second level involves system-level standard light source calibration, including:

[0064] A standard transmission light source is provided, and any fiber optic probe master that has completed the first-level calibration is aligned with the standard transmission light source according to the geometric conditions.

[0065] Acquire the spectral signal of the standard transmission light source. Obtain the pre-measured absolute spectral radiance value of the standard transfer light source under the specified geometric conditions. ,

[0066] The absolute spectral response function was calculated. as follows,

[0067]

[0068] in, When i takes master The value of .

[0069] In this preferred embodiment, a two-level calibration process is designed for the acquisition system consisting of a multi-fiber optic cable and a single multi-channel spectrometer—first, “multi-channel spectral response consistency calibration” is performed, and then “system-level standard light source calibration” is performed, so as to ensure that all channel measurement data have both high internal consistency and are traceable to the highest standard.

[0070] As a preferred embodiment of the present invention, specifically...

[0071] The optical fiber is a 1-to-8 splitter fiber, so the value range of i is [1, 8].

[0072] In this preferred embodiment, considering the specifications and ease of use of currently mature multi-channel spectrometer equipment, an 8-to-1 fiber optic splitter is used to construct the acquisition system (measurement system) for user convenience.

[0073] In a preferred embodiment of the present invention, specifically, the original reference spectral signal is the original spectral signal when i is 1. Or the average of the raw spectral signals of all channels.

[0074] In this preferred embodiment, the raw spectral signal of the first channel can be used for convenience. As a reference raw spectral signal, the average value of the raw spectral signals of all channels can also be used to improve the accuracy of the results. This can balance the noise problem caused by a single channel to some extent.

[0075] In a preferred embodiment of the present invention, the method further includes,

[0076] Using a verification light source with known spectral characteristics, measurements are performed under the same conditions through the measurement system to obtain measurement results. The measurement results are compared with the known corresponding results of the verification light source. If the differences between each channel and the absolute error are both less than the corresponding preset thresholds, the two-level calibration is determined to be passed; otherwise, the two-level calibration is determined to be failed.

[0077] In this preferred embodiment, calibration and verification are performed in the above manner. Another verification light source with known spectral characteristics is used, and measurements are taken with 8 probes. The results calculated according to the above formula are compared with the known values ​​of the verification light source. If the differences and absolute errors between each channel are less than the preset thresholds (e.g., chromaticity coordinate difference Δx, Δy < 0.001, brightness difference < 1%), then the calibration is deemed valid.

[0078] In a preferred embodiment of the present invention, the method further includes sampling preset environmental parameters of the fiber optic probe master at preset intervals, calculating the environmental score at the sampling time based on preset weights, and determining whether there is an abnormal environmental event based on the environmental score. If there is, two-level calibration is performed again.

[0079] In a preferred embodiment of the present invention, specifically, determining whether an abnormal environmental event exists based on the environmental score includes,

[0080] Multiple environmental score data groups are obtained by grouping the environmental scores of J consecutive sampling times with a fixed preset number J.

[0081] For two adjacent environmental score data groups, the data in the earlier environmental score data group is mapped to a two-dimensional plane with the sampling sequence number on the horizontal axis and the environmental score on the vertical axis. A two-dimensional curve fitting is performed to obtain a first curve. The first curve is shifted to the right by J units to obtain a second curve. Then, the minimum distance from the data in the later environmental score data group to the second curve is calculated in the two-dimensional plane. The number K of data exceeding the preset distance_threshold in the minimum distance is counted. If K / J is greater than the preset Proportion_threshold, it is determined that there is an environmental abnormal event; otherwise, it is determined that there is no environmental abnormal event.

[0082] In this preferred embodiment, considering that the results of two-level calibration may have some deviation when the environmental parameters differ significantly, the above-mentioned environmental monitoring algorithm is proposed. It compares the sampling data in adjacent large sampling periods to determine whether an environmental anomaly has occurred. Compared with the commonly used method of comparing the average value of a large sampling period with a fixed threshold, this environmental monitoring algorithm is more sensitive and can more accurately determine environmental anomalies, ensuring the accuracy of subsequent color calibration results. The types of environmental parameters are determined by pre-selection, and their preset weights can be determined by methods such as AHP. After determining the types of environmental parameters and their weights, the environmental score can be calculated in real time.

[0083] The following is a specific application example of the present invention.

[0084] Hardware configuration:

[0085] like Figure 1 As shown, the hardware configuration of this implementation system is as follows:

[0086] Host computer: Industrial control computer, running self-developed calibration software.

[0087] Spectrometer: Employs a single-channel miniature fiber optic spectrometer with a wavelength range of 380-780nm and USB communication.

[0088] Fiber optic assembly: A custom-designed 1-to-8 fiber bundle, with a common end consisting of a 600μm core SMA905 connector fiber connected to the spectrometer; the eight branch probes are fixed-focus probes of the same specification with SMA905 connectors, mounted on a multi-probe bracket that is adjustable in XYZ axes and pitch.

[0089] Calibrate the light source:

[0090] Uniform light source: Uses a Φ200mm integrating sphere with a built-in halogen tungsten lamp and a diffuser glass at the outlet.

[0091] Standard light source: A standard halogen tungsten lamp calibrated by the National Institute of Metrology of China is used, with a spectral irradiance of [missing information]. Known.

[0092] The device under test (DUT) is an RGB-LED automotive ambient light. It can receive commands from a host computer and independently and precisely control the lighting and PWM parameters via a LIN bus.

[0093] Calibration process implementation (see details) Figure 3 Phase 1 Process)

[0094] Level 1 Consistency Calibration:

[0095] Turn on the integrating sphere uniform light source and preheat for 30 minutes until stable.

[0096] Move the multi-probe bracket to the front of the integrating sphere outlet and make fine adjustments so that the end faces of the eight probes are coplanar and vertically aligned with the center area of ​​the outlet.

[0097] The host computer software controls the spectrometer to perform "multi-probe calibration." The software automatically switches between modes sequentially (either by controlling a mechanical light-shielding plate or simply manually connecting the common terminal to each probe, depending on the level of automation), allowing the spectrometer to collect light signals from each of the eight probes through the common terminal, averaging the results after 10 collections from each probe. .

[0098] The software uses probe 1 as a reference to calculate the relative correction coefficients for each channel. And store this coefficient matrix in the database.

[0099] Second-level absolute calibration:

[0100] Install standard halogen tungsten lamps on the light track, turn them on, and preheat them.

[0101] Use the probe to align strictly according to the distance and vertical conditions specified in the standard lamp certificate.

[0102] The host computer controls the spectrometer to collect signals from the standard lamps and obtain... .

[0103] Software reads standard lamps Data file, combined with the main probe According to the formula Calculate the core compensation curve of the system . Figure 2 The data visualization results from this step visually demonstrate the high degree of agreement between the compensated waveform and the standard waveform, proving the effectiveness of spectral-level compensation.

[0104] Measurement process implementation (see details) Figure 3 Phase Two Process)

[0105] The eight-channel ambient light to be tested was fixed on the test fixture.

[0106] Adjust the multi-probe bracket so that the eight probes (P1-P8) are precisely aligned with the eight lights.

[0107] Select the corresponding product model in the software, and the system will automatically load the target color parameters.

[0108] Perform "Automatic Calibration". The software executes the following steps sequentially:

[0109] a. Send a command to the lights: turn on channel 1 (L1) and turn off channels 2 to 8 (L2-L8).

[0110] b. Immediately trigger the spectrometer to acquire the signal. .

[0111] c. Continuing in this cycle, illuminate L2 through L8 sequentially and collect data to complete the measurement of all 8 channels. This "time-division illumination-acquisition" mechanism perfectly solves the limitation of a single-channel spectrometer in simultaneously acquiring multiple signals and fundamentally avoids mutual interference from stray light between channels, ensuring data purity.

[0112] For each channel The software automatically calls the database. and For the original signal Perform real-time calculations: .

[0113] Based on the calculation The software further calculates the precise color coordinates and luminous flux of each channel, compares them with the target values, calculates the optimal PWM parameters through a closed-loop algorithm, and finally writes them to the lamp MCU via the LIN bus.

[0114] This invention also proposes a color calibration system for automotive interior ambient lighting based on multi-channel optical fiber synchronous acquisition, comprising the following:

[0115] The multi-channel synchronous spectral acquisition unit includes a single multi-channel spectrometer and an 8-to-1 fiber optic probe connected to it.

[0116] The two-stage calibration unit includes a uniformity standard light source and a standard transfer light source;

[0117] The probe positioning fixture is used to precisely align eight fiber optic probes to the same area of ​​a uniformity standard light source during calibration.

[0118] The control module is used to execute the steps of the method described above during runtime, thereby completing the two-level calibration of the measurement system and the color calibration of the target multi-channel ambient light.

[0119] In a preferred embodiment of the present invention, the uniformity standard light source is an integrating sphere light source with a diffuser plate at its exit to ensure the uniformity of spectrum and irradiance within the probe measurement area.

[0120] In a preferred embodiment of the present invention, the probe positioning fixture uses a three-dimensional adjustable probe fixture to simultaneously fix eight fiber optic probes, ensuring that their distances and angles relative to the light-emitting surface of the uniform standard light source are exactly the same, thus eliminating differences introduced by geometric factors.

[0121] As a preferred embodiment of the present invention, specifically, the single spectrometer is a spectrometer with multiple independent imported or internal optical spectrometers and detector arrays, which can realize true hardware synchronous exposure and acquisition of spectral data of eight channels, completely eliminating the error caused by time asynchrony.

[0122] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of the solution in this embodiment, depending on actual needs.

[0123] Furthermore, the functional modules in the various embodiments of the present invention can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0124] If the integrated module is implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0125] Although the description of the invention has been quite detailed and particularly of several described embodiments, it is not intended to limit it to any of these details or embodiments or any particular embodiment, but should be considered as providing a broad possible interpretation of the claims by referring to the appended claims and taking into account the prior art, thereby effectively covering the intended scope of the invention. Furthermore, the invention has been described above with respect to embodiments foreseeable by the inventors in order to provide a useful description, and non-substantial modifications to the invention that have not yet been foreseen may still represent equivalent modifications.

[0126] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the above-described embodiments. Any embodiment that achieves the technical effects of the present invention using the same means should fall within the protection scope of the present invention. Within the protection scope of the present invention, various modifications and variations can be made to the technical solutions and / or implementation methods.

Claims

1. A method for color calibration of automotive interior ambient lighting based on multi-channel optical fiber synchronous acquisition, characterized in that, Including the following: Align each light-emitting unit of the target multi-channel ambient light with the corresponding probe of the one-to-many fiber optic cable of the measurement system, and have the probe synchronously acquire the raw signals of each channel corresponding to the light-emitting unit. ; For the i-th channel, its true absolute spectral radiance Calculated using the following formula: ； based on Complete color calibration; The measurement system is obtained through two-stage calibration. The first stage is multi-channel spectral response consistency calibration, including: A uniform standard light source is provided, whose light-emitting surface is uniform in space and angle. Multiple probes of the one-to-many fiber are aligned with the same region of the uniform standard light source under the same geometric conditions. The spectrometer is then activated to synchronously acquire the raw spectral signals of each channel. ; Calculate the relative spectral response correction factor for each channel relative to the original reference spectrum signal. : ； in, As the reference spectrum original signal, Stored as the system's intrinsic correction matrix; The second level involves system-level standard light source calibration, including: A standard transmission light source is provided, and any fiber optic probe master that has completed the first-level calibration is aligned with the standard transmission light source according to the geometric conditions. Acquire the spectral signal of the standard transmission light source. Obtain the pre-measured absolute spectral radiance value of the standard transfer light source under the specified geometric conditions. , The absolute spectral response function was calculated. as follows, ； in, When i takes master The value of .

2. The method for color calibration of automotive interior ambient lighting based on multi-channel optical fiber synchronous acquisition according to claim 1, characterized in that, Specifically, The optical fiber is a 1-to-8 splitter fiber, so the value range of i is [1, 8].

3. The method for color calibration of automotive interior ambient lighting based on multi-channel optical fiber synchronous acquisition according to claim 1, characterized in that, Specifically, the original reference spectrum signal is the original spectrum signal when i is 1. Or the average of the raw spectral signals of all channels.

4. The method for color calibration of automotive interior ambient lighting based on multi-channel optical fiber synchronous acquisition according to claim 1, characterized in that, The method also includes, Using a verification light source with known spectral characteristics, measurements are performed under the same conditions through the measurement system to obtain measurement results. The measurement results are compared with the known corresponding results of the verification light source. If the differences between each channel and the absolute error are both less than the corresponding preset thresholds, the two-level calibration is determined to be passed; otherwise, the two-level calibration is determined to be failed.

5. The method for color calibration of automotive interior ambient lighting based on multi-channel optical fiber synchronous acquisition according to claim 1, characterized in that, The method further includes sampling preset environmental parameters for the fiber optic probe master at preset intervals, calculating the environmental score at the sampling time based on preset weights, and determining whether there are any abnormal environmental events based on the environmental score. If so, two-level calibration is performed again.

6. The method for color calibration of automotive interior ambient lighting based on multi-channel optical fiber synchronous acquisition according to claim 5, characterized in that, Specifically, determining whether an abnormal environmental event exists based on the environmental score includes: Multiple environmental score data groups are obtained by grouping the environmental scores of J consecutive sampling times with a fixed preset number J. For two adjacent environmental score data groups, the data in the earlier environmental score data group is mapped to a two-dimensional plane with the sampling sequence number on the horizontal axis and the environmental score on the vertical axis. A two-dimensional curve fitting is performed to obtain a first curve. The first curve is shifted to the right by J units to obtain a second curve. Then, the minimum distance from the data in the later environmental score data group to the second curve is calculated in the two-dimensional plane. The number K of data exceeding the preset distance_threshold in the minimum distance is counted. If K / J is greater than the preset Proportion_threshold, it is determined that there is an environmental abnormal event; otherwise, it is determined that there is no environmental abnormal event.

7. A color calibration system for automotive interior ambient lighting based on multi-channel fiber optic synchronous acquisition, characterized in that, Including the following: The multi-channel synchronous spectral acquisition unit includes a single multi-channel spectrometer and an 8-to-1 fiber optic probe connected to it. The two-stage calibration unit includes a uniformity standard light source and a standard transfer light source; The probe positioning fixture is used to precisely align eight fiber optic probes to the same area of ​​a uniformity standard light source during calibration. The control module is used to perform the steps of the method as described in any one of claims 1-6 during runtime, thereby completing the two-level calibration of the measurement system and the color calibration of the target multi-channel ambient light.

8. The automotive interior ambient lighting color calibration system based on multi-channel optical fiber synchronous acquisition according to claim 7, characterized in that, Specifically, the uniformity standard light source adopts an integrating sphere light source, and a diffuser plate is configured at its exit to ensure the uniformity of spectrum and irradiance within the probe measurement area.

9. A color calibration system for automotive interior ambient lighting based on multi-channel optical fiber synchronous acquisition according to claim 7, characterized in that, Specifically, the probe positioning fixture uses a three-dimensional adjustable probe fixture to simultaneously fix eight fiber optic probes, ensuring that their distances and angles relative to the light-emitting surface of the uniform standard light source are exactly the same, eliminating differences introduced by geometric factors.

10. A color calibration system for automotive interior ambient lighting based on multi-channel optical fiber synchronous acquisition according to claim 7, characterized in that, Specifically, the single spectrometer is a spectrometer equipped with multiple independent imported or internal optical spectrometers and detector arrays, which can achieve true hardware synchronous exposure and acquisition of spectral data from eight channels, completely eliminating errors caused by time asynchrony.

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