Imaging color and brightness meter for double-path spectrum correction and light measurement method

Abstract

The invention discloses an imaging color and brightness meter with double-path spectrum correction and a light measurement method, which are used for meeting measurement requirements of different measurement environments and precision. The device comprises a shell, a control module, an internal spectrometer, an optical processing module, a rotary disc, a lens, a first optical fiber, a second optical fiber and a light splitting assembly, the wheel rotating disc and the light splitting assembly are both arranged on the shell, and the shell is provided with an interface. The interface is connected with the light splitting assembly through a first optical fiber, the internal spectrometer is connected with the light splitting assembly through a second optical fiber, and the interface is used for being connected with an external spectrometer; a shooting lens and a reflecting prism are arranged on the wheel rotating disc, and when the wheel rotating disc rotates until the shooting lens is coaxial with an incident light beam, the incident light beam reaches the light processing module through the shooting lens; when the wheel rotating disc rotates to the reflecting prism to be coaxial with the incident light beam, the incident light beam is reflected by the reflecting prism to form an emergent light beam coaxial with the light splitting assembly, and the light splitting assembly is used for introducing the emergent light beam into the first optical fiber and / or the second optical fiber.

Description

Technical Field

[0001] The present application relates to the technical field of color brightness measurement equipment, and in particular to an imaging colorimeter with dual-path spectral correction and a light measurement method. Background Art

[0002] Imaging colorimeter is an important optical measurement tool. It measures and quantifies the color and brightness characteristics of an object by capturing and analyzing the spectral information reflected or emitted by the object. It is widely used in scientific research, industrial quality control, environmental monitoring, consumer product testing and other fields.

[0003] Currently, imaging colorimeter on the market are mainly divided into two categories, namely, imaging colorimeter with external high-precision spectrometer and imaging colorimeter with built-in micro-spectrometer. Imaging colorimeter with external high-precision spectrometer can provide extremely high measurement accuracy by connecting high-precision spectral analysis equipment, but due to the large size and heavy weight of the equipment, it has obvious shortcomings in portability; imaging colorimeter with built-in micro-spectrometer achieves portability by miniaturizing the spectrometer and integrating it into the imaging colorimeter, but due to the limitations of size and power consumption, the measurement range of the micro-spectrometer is often small, and the measurement accuracy is poor under low brightness conditions.

[0004] In some situations where both high-precision measurement and portability are required, it is necessary to carry both an imaging colorimeter with an external high-precision spectrometer and an imaging colorimeter with a built-in micro-spectrometer to meet the measurement requirements of different measurement environments and measurement accuracies. This increases the user's carrying burden and the measurement cost and complexity.

[0005] Based on this, the present application proposes a dual-path spectrally corrected imaging colorimeter and a light measurement method to solve the above technical problems. Summary of the invention

[0006] In order to solve the above technical problems, the present application provides a dual-path spectrally corrected imaging colorimeter and light measurement method, which can meet the measurement requirements of different measurement environments and accuracies.

[0007] The first aspect of the present application provides a dual-path spectrally corrected imaging colorimeter, comprising:

[0008] A housing, a control module, an internal spectrometer, a light processing module, a rotating disk, a lens, a first optical fiber, a second optical fiber and a light splitting component;

[0009] The control module, the internal spectrometer and the light processing module are all arranged in the shell, and the control module is electrically connected to the internal spectrometer and the light processing module respectively; the lens is arranged on the shell, and the lens is used to transmit an incident light beam, and the incident light beam is transmitted along the lens into the shell, and an optical path connection is formed between the lens and the light processing module; the rotating disk and the spectroscopic component are both arranged on the shell, and the rotating disk is located between the lens and the light processing module, and an interface is arranged on the shell, and the measurement accuracy of the external spectrometer is higher than that of the internal spectrometer; the interface and the spectroscopic component are connected through the first optical fiber, and the internal spectrometer and the spectroscopic component are connected through the second optical fiber, and the interface is used to connect with the external spectrometer;

[0010] A shooting lens and a reflecting prism are provided on the rotating disk, and the rotating disk is controlled to rotate. When the rotating disk rotates to the point where the shooting lens is coaxial with the incident light beam, the incident light beam passes through the shooting lens and reaches the light processing module; when the rotating disk rotates to the point where the reflecting prism is coaxial with the incident light beam, the incident light beam is reflected by the reflecting prism to form an outgoing light beam coaxial with the spectroscopic component, and the spectroscopic component is used to introduce the outgoing light beam into the first optical fiber and / or the second optical fiber.

[0011] Optionally, the light splitting component is an optical fiber plug and a fixing seat, the fixing seat is fixed on the housing, the optical fiber plug is fixed on the fixing seat, and the optical fiber plug is coaxial with the outgoing light beam;

[0012] The first optical fiber and the second optical fiber are both arranged in the optical fiber plug, the first optical fiber is tangent to the second optical fiber, and the tangent point is aligned with the axis of the outgoing light beam.

[0013] Optionally, a core diameter of the first optical fiber is greater than a core diameter of the second optical fiber.

[0014] Optionally, both the first optical fiber and the second optical fiber are single-core optical fibers.

[0015] Optionally, the splitting component is a splitter, the first optical fiber is connected to the output end of the splitter, the second optical fiber is connected to the output end of the splitter, a third optical fiber extends outward from the input end of the splitter, the third optical fiber is coaxial with the outgoing light beam, and the splitter is used to guide the outgoing light beam into the first optical fiber and the second optical fiber at the same time.

[0016] Optionally, the splitter assembly includes a track and a position switching seat, the track is arranged on the shell, the position switching seat is arranged on the track, the first optical fiber and the second optical fiber are arranged side by side on the position switching seat, and the position switching seat is controlled to move along the track so that the first optical fiber or the second optical fiber is coaxial with the output light beam.

[0017] Optionally, the track is a straight track, and the straight track is perpendicular to the outgoing light beam.

[0018] Optionally, the beam splitter component is a beam splitter, which includes a reflection state and a refraction state. The beam splitter is controlled to switch between the reflection state and the refraction state. In the reflection state, the outgoing light beam reaches the second optical fiber after being reflected by the beam splitter, and in the refraction state, the outgoing light beam reaches the first optical fiber after being refracted by the beam splitter.

[0019] A second aspect of the present application provides a light measurement method, which is applied to the imaging colorimeter in the first aspect and any optional manner of the first aspect, and the light measurement method includes:

[0020] The control wheel turns, and when the shooting lens is coaxial with the incident light beam, the control light processing module shoots the incident light beam passing through the shooting lens to obtain an image;

[0021] Calculating first color brightness values ​​of all pixels in the image, wherein the first color brightness values ​​at least include a center point brightness value of a center pixel of the image;

[0022] Controlling the rotating disk to rotate so that the reflecting prism is coaxial with the incident light beam, and the incident light beam forms an outgoing light beam coaxial with the light splitting component after passing through the reflecting prism;

[0023] Comparing the brightness value of the center point with a preset brightness threshold, and determining a target spectrometer according to the comparison result;

[0024] Controlling the light splitting component to guide the outgoing light beam to the target spectrometer, and collecting the second color brightness value of the center point of the outgoing light beam through the target spectrometer;

[0025] The first color brightness value is calibrated based on the second color brightness value to obtain a target color brightness value, and the target color brightness value is derived.

[0026] Optionally, determining the target spectrometer according to the comparison result includes:

[0027] If the brightness value of the center point is greater than the preset brightness threshold, determining that the built-in internal spectrometer is the target spectrometer;

[0028] If the central point brightness value is less than the preset brightness threshold, it is determined that the external spectrometer connected to the interface is the target spectrometer, and the measurement accuracy of the external spectrometer is higher than the measurement accuracy of the internal spectrometer.

[0029] It can be seen from the above technical solutions that this application has the following effects:

[0030] The present application sets an interface on the shell, and the interface can be connected to an external spectrometer. The measurement accuracy of the external spectrometer is higher than that of the internal spectrometer built into the shell. The spectrometer component is set on the shell. When the incident light beam forms an outgoing light beam through the reflecting prism, the outgoing light beam is coaxial with the spectrometer component. The spectrometer component is connected to the interface through a first optical fiber, and the spectrometer component is connected to the internal spectrometer through a second optical fiber. The outgoing light beam can be introduced into the first optical fiber, or the outgoing light beam can be introduced into the second optical fiber through the spectrometer component. Therefore, the present application can select internal spectrometers or external spectrometers with different accuracies under different measurement environments and measurement accuracy requirements through the spectrometer component to meet the measurement requirements of different measurement environments and measurement accuracy; and when dealing with measurements with different measurement accuracies, it is no longer necessary to carry an imaging colorimeter with an external high-precision spectrometer and an imaging colorimeter with a built-in miniature spectrometer at the same time, which can reduce the carrying burden. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solution in the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A schematic diagram of a dual-path spectrally corrected imaging colorimeter for the present application;

[0033] Figure 2 Another schematic diagram of a dual-path spectrally corrected imaging colorimeter of the present application;

[0034] Figure 3 Another schematic diagram of a dual-path spectrally corrected imaging colorimeter of the present application;

[0035] Figure 4 A schematic diagram of a dual-path spectrally corrected imaging colorimeter for the present application;

[0036] Figure 5 A schematic diagram of an optical fiber plug in a dual-path spectrally corrected imaging colorimeter of the present application;

[0037] Figure 6Another schematic diagram of an optical fiber plug in a dual-path spectrally corrected imaging colorimeter of the present application;

[0038] Figure 7 A schematic diagram of a spectrometer in a dual-path spectrally corrected imaging colorimeter of the present application;

[0039] Figure 8 A schematic diagram of a position switch seat in a dual-path spectrally corrected imaging colorimeter of the present application;

[0040] Fig. 9 A schematic diagram of the refraction of a beam splitter in a dual-path spectrally corrected imaging colorimeter of the present application;

[0041] Fig.10 A schematic diagram of a beam splitter reflection in a dual-path spectrally corrected imaging colorimeter of the present application;

[0042] Fig.11 A schematic flow chart of a light measurement method for the present application;

[0043] Fig.12 Another schematic flow chart of a light measurement method for the present application;

[0044] Among them, there are a shell 01, a control module 02, an internal spectrometer 03, a light processing module 04, a rotating disk 05, a first optical fiber 06, a second optical fiber 07, a beam splitter 08, an interface 09, a shooting lens 10, a measuring plate 11, a reflecting prism 12, a driving motor 13, an optical fiber plug 14, a fixing seat 15, a beam splitter 16, a third optical fiber 17, a track 18, a position switching seat 19, and a lens 20. DETAILED DESCRIPTION

[0045] In the present invention, the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", and "longitudinal" are based on the directions or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation directions of the various components or components.

[0046] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0047] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] In addition, the structures, proportions, sizes, etc. drawn in the drawings in the present application are only used to match the contents disclosed in the specification for the technical personnel in this field to understand and read, and are not used to limit the restrictive conditions under which the present application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present application without affecting the effects and purposes that can be achieved by the present application.

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] The present application provides a dual-path spectrally corrected imaging colorimeter and light measurement method, which are used to meet the measurement requirements of different measurement environments and accuracies and reduce the burden of carrying. The specific implementation process of the present application is described as follows.

[0051] See also Figures 1 to 10 In a first aspect, the present application provides a dual-path spectrally corrected imaging colorimeter comprising:

[0052] Housing 01, control module 02, internal spectrometer 03, light processing module 04, rotating disk 05, lens 20, first optical fiber 06, second optical fiber 07 and light splitting component;

[0053] The control module 02, the internal spectrometer 03 and the light processing module 04 are all arranged in the housing 01, and the control module 02 is electrically connected to the internal spectrometer 03 and the light processing module 04 respectively; the lens 20 is arranged on the housing 01, and the lens 20 is used to transmit the incident light beam, and the incident light beam is transmitted along the lens into the housing 01, and an optical path connection is formed between the lens 20 and the light processing module 04; the rotating disk 05 and the light splitting component are both arranged on the housing 01, and the rotating disk 05 is located between the lens 20 and the light processing module 04, and the housing 01 is provided with an interface 09, and the measurement accuracy of the external spectrometer is higher than that of the internal spectrometer 03; the interface 09 is connected to the light splitting component through the first optical fiber 06, and the internal spectrometer 03 is connected to the light splitting component through the second optical fiber 07, and the interface 09 is used to connect with the external spectrometer;

[0054] The rotating disk 05 is provided with a shooting lens 10 and a reflecting prism 12. The rotating disk 05 is controlled to rotate. When the rotating disk 05 rotates to the point where the shooting lens 10 is coaxial with the incident light beam, the incident light beam passes through the shooting lens 10 and reaches the light processing module 04; when the rotating disk 05 rotates to the point where the reflecting prism 12 is coaxial with the incident light beam, the incident light beam is reflected by the reflecting prism 12 to form an outgoing light beam coaxial with the light splitting component. The light splitting component is used to introduce the outgoing light beam into the first optical fiber 06 and / or the second optical fiber 07.

[0055] A measuring plate 11 is provided on the rotating disk 05, and the measuring plate 11 is equal in size to the photographing lens 10. A reflecting prism 12 is fixed on the measuring plate 11, and the measuring plate 12 is parallel to the rotating disk 05. The reflecting prism 12 is within the area of ​​the measuring plate 11, and the mirror surface of the reflecting prism 12 forms an angle with the measuring plate 11, and the angle is an acute angle, so that when the incident light beam is irradiated on the mirror surface, the incident light beam can be reflected at other angles (the reflected light beam is the outgoing light beam).

[0056] A space is provided inside the shell 01, and an internal spectrometer 03, a light processing module 04 and a control module 02 are all arranged in the space and are respectively connected to the shell 01. A driving motor 13 is also provided in the space, and a rotating disk 05 is arranged in front of the shell 01 and is movably connected to the shell 01. The front here refers to the light input direction of the incident light beam. The driving motor 13 is connected to the rotating disk 05. The driving motor 13 can drive the rotating disk 05 to rotate. The driving motor 13 and the rotating disk 05 can be connected by a belt or a gear.

[0057] The control module 02 is electrically connected to the driving motor 13, the light processing module 04, the spectroscopic component and the internal spectrometer 03 respectively. The control module 02 is used to control the operation of the light processing module 04, the internal spectrometer 03, the spectroscopic component and the driving motor 13. The light processing module 04 is used to shoot the incident light beam when the shooting lens 10 is coaxial with the incident light beam. The light processing module 05 can obtain the image of the incident light beam and analyze and process the image to obtain the color brightness value in the image; the light processing module 04 is equipped with an image sensor and a data processing module, and the image of the incident light beam can be obtained through the image sensor.

[0058] The angle between the mirror surface of the reflecting prism 12 and the measuring plate 11 is 45 degrees. After the incident light beam reaches the mirror surface, it is reflected out. At this time, the incident light beam and the outgoing light beam are in a perpendicular state.

[0059] The lens 20 is aligned with the light processing module 04, and an optical path connection is formed between the lens 20 and the light processing module 04. The incident light beam is emitted from the object to be measured, and the lens 20 transmits it into the housing 01 (reaching the reflecting prism 12 on the rotating disk 05 or passing through the shooting lens 10 to reach the light processing module 04). The rotating disk 05 is located between the lens 20 and the light processing module 04. The shooting lens 10 and the reflecting prism 12 are provided on the rotating disk 05. The rotating disk 05 rotates in a controlled manner. When the rotating disk 05 rotates until the shooting lens 10 is coaxial with the incident light beam, the optical path between the lens 20, the shooting lens 10 and the light processing module 04 is connected, and the incident light beam can reach the light processing module 04 after passing through the shooting lens 10.

[0060] When the rotating disk 05 rotates to the point where the reflecting prism 12 is coaxial with the incident light beam, the axis of the incident light beam is aligned with the reflecting prism 12, and the incident light beam is irradiated on the mirror surface of the reflecting prism 12, and is reflected by the mirror surface to form an outgoing light beam, which is coaxial with the arrangement direction of the spectroscopic component.

[0061] In addition, two neutral density filters are arranged on the rotating disk 05 . The two neutral density filters have different light transmittances. The shape and size of each neutral density filter are the same as those of the shooting lens 10 .

[0062] The light splitting component is arranged on the housing 01, the light splitting component is coaxial with the outgoing light beam, the light splitting component is connected to the interface 09 through the first optical fiber 06, and the light splitting component is connected to the internal spectrometer 03 through the second optical fiber 07. The light splitting component has the function of introducing the outgoing light beam into the first optical fiber 06 or the second optical fiber 07, and can also introduce the outgoing light beam into the first optical fiber 06 and the second optical fiber 07 at the same time. The type of the interface 09 can be an SMA interface or an LC interface.

[0063] In actual use, the internal spectrometer 03 or the external spectrometer is selected for measurement according to the requirements of measurement accuracy or the measurement environment. If high-precision measurement is not required, the interface 09 on the shell 01 does not need to be connected to the external spectrometer, and only the built-in internal spectrometer 03 can be used for light measurement. When a more accurate external spectrometer is selected, the external spectrometer is connected to the interface 09 on the shell 01, and the outgoing light beam is introduced into the first optical fiber 06 through the spectrometer component, so that it reaches the external spectrometer for light measurement.

[0064] In this embodiment, an interface 09 is provided on the outer shell, and this interface 09 can be connected to an external spectrometer. The measurement accuracy of the external spectrometer is higher than that of the internal spectrometer 03 built into the outer shell. The spectrometer component is provided on the shell 01. When the incident light beam forms an outgoing light beam through the reflecting prism 12, the outgoing light beam is coaxial with the spectrometer component. The spectrometer component is connected to the interface 09 through the first optical fiber 06, and the spectrometer component is connected to the internal spectrometer 03 through the second optical fiber 07. The outgoing light beam can be introduced into the first optical fiber 06 or the outgoing light beam can be introduced into the second optical fiber 07 through the spectrometer component. Therefore, the present application can select an internal spectrometer 03 or an external spectrometer with different accuracies under different measurement environments and measurement accuracy requirements through the spectrometer component to meet the measurement requirements of different measurement environments and measurement accuracy; and when dealing with measurements with different measurement accuracies, it is no longer necessary to carry an imaging colorimeter with an external high-precision spectrometer and an imaging colorimeter with a built-in micro-spectrometer at the same time, which can reduce the carrying burden.

[0065] In addition, the built-in internal spectrometer can be used for spectral measurement, and the interface can also be used to connect an external spectrometer for spectral measurement, achieving the compatibility of high precision and portability.

[0066] Please continue reading Figure 5 and Figure 6 In an optional embodiment, the splitting component is a fiber optic plug 14 and a fixing seat 15, the fixing seat 15 is fixed on the housing 01, the fiber optic plug 14 is fixed on the fixing seat 15, and the fiber optic plug 14 is coaxial with the outgoing light beam; the fiber optic plug 14 is sleeved outside the first optical fiber 06 and the second optical fiber 07, the first optical fiber 06 and the second optical fiber 07 are both arranged inside the fiber optic plug 14, the first optical fiber 06 and the second optical fiber 07 are tangent to each other, and the tangent point is aligned with the axis of the outgoing light beam.

[0067] The first optical fiber 06 may be provided with a single-core optical fiber or a bundle of several single-core optical fibers. The configuration of the second optical fiber 07 is the same as that of the first optical fiber 06 .

[0068] In this embodiment, the fixing seat 15 is fixed on the shell 01, the optical fiber plug 14 is fixed on the fixing seat 15, and the arrangement direction of the optical fiber plug 14 is coaxial with the outgoing light beam, one end of the first optical fiber 06 and one end of the second optical fiber 07 are jointly arranged in the optical fiber plug 14, the end of the first optical fiber 06 is flush with the end of the second optical fiber 07, the cross-sections of the first optical fiber 06 and the second optical fiber 07 are both circular, the end of the first optical fiber 06 is tangent to the outer diameter of the end of the second optical fiber 07, and the tangent point is aligned with the axis of the outgoing light beam. At the tangent point, the outgoing light beam is evenly divided into two paths, entering the first optical fiber 06 and the second optical fiber 07 respectively, and the amount of information carried by the two optical signals during the transmission process is similar.

[0069] In this optional embodiment, the core diameter of the first optical fiber 06 is greater than the core diameter of the second optical fiber 07. In this embodiment, the core diameter of the first optical fiber 06 connected to the interface 09 is set to be larger, and when the interface 09 is connected to an external spectrometer with higher precision, a higher brightness optical signal can be provided to the external spectrometer, thereby reducing signal loss.

[0070] In this optional embodiment, the first optical fiber 06 and the second optical fiber 07 are both single-core optical fibers. By setting up single-core optical fibers, this embodiment can improve the anti-interference ability and effectively resist the interference of the external environment on the optical signal; it not only improves the transmission efficiency of the optical signal and the measurement accuracy, but also simplifies the optical path design.

[0071] Please continue reading Figure 7 In an optional embodiment, the splitting component is a splitter 16, the first optical fiber 06 is connected to the output end of the splitter 16, the second optical fiber 07 is connected to the output end of the splitter 16, and the input end of the splitter 16 extends outward to form a third optical fiber 17, the third optical fiber 17 is coaxial with the outgoing light beam, and the splitter 16 is used to guide the outgoing light beam into the first optical fiber 06 and the second optical fiber 07 at the same time.

[0072] In this embodiment, by setting the optical splitter 16, the outgoing light beam can be introduced into the first optical fiber 06 and the second optical fiber 07 at the same time. Specifically, the optical splitter 16 includes an input end and an output end, which is responsible for guiding the input outgoing light beam into the first optical fiber 06 and the second optical fiber 07 at the same time; a third optical fiber 17 is arranged on the input end of the optical splitter 16, and the arrangement direction of the third optical fiber 17 is coaxial with the outgoing light beam, that is, the outgoing light beam arrives at the third optical fiber 17. When the outgoing light beam enters the optical splitter 16 through the third optical fiber 17, the optical splitter 16 guides the outgoing light beam into the first optical fiber 06 and the second optical fiber 07 at the same time, thus ensuring that the information amount carried by the two optical signals during the transmission process is similar. By setting the optical splitter 16, the outgoing light beam can be guided into the first optical fiber 06 and the second optical fiber 07 at the same time and accurately, thereby improving the light splitting efficiency, reducing the loss and scattering of the optical signal, and ensuring the stability and accuracy of the optical signal.

[0073] Please continue reading Figure 8 In an optional embodiment, the splitter assembly includes a track 18 and a position switching seat 19, the track 18 is set on the housing 01, the position switching seat 19 is set on the track 18, the first optical fiber 06 and the second optical fiber 07 are set side by side on the position switching seat 19, and the position switching seat 19 is controlled to move along the track 18 so that the first optical fiber 06 or the second optical fiber 07 is coaxial with the output light beam.

[0074] The track 18 is installed on the housing 01 to provide a smooth and stable moving path for the position switching seat 19. The track 18 can be in the form of a linear guide or a curved guide, etc., depending on the application requirements.

[0075] In this embodiment, the first optical fiber 06 and the second optical fiber 07 are independent and fixed on the position switching seat 19 respectively. Through the cooperation between the position switching seat 19 and the track 18, the positions of the first optical fiber 06 and the second optical fiber 07 can be moved. Specifically, the position switching seat 19 can be controlled to move along the track 18, and the movement of the position switching seat 19 can be manually controlled.

[0076] In one feasible manner, the position switching seat 19 moves on the track 18 in an automatic manner, such as being driven by a stepper motor or a servo motor. The stepper motor or the servo motor is electrically connected to the control module 02 in the housing 01, and control instructions are sent to the stepper motor or the servo motor through the control module 02 to achieve control.

[0077] In this optional embodiment, the track 18 is a straight track, and the straight track is perpendicular to the outgoing light beam. In this embodiment, when the position switching seat 19 moves, the first optical fiber 06, the second optical fiber 07 and the outgoing light beam are always on the same plane, so that the end of the first optical fiber 06 and the end of the second optical fiber 07 can be switched along a direction perpendicular to the outgoing light beam.

[0078] Please continue reading Figures 9 and 10 In an optional embodiment, the light splitting component is a beam splitter 08, which includes a reflection state and a refraction state. The beam splitter 08 is controlled to switch between the reflection state and the refraction state. In the reflection state, the outgoing light beam is reflected by the beam splitter 08 and arrives at the second optical fiber 07. In the refraction state, the outgoing light beam is refracted by the beam splitter 08 and arrives at the first optical fiber 06.

[0079] By utilizing the special optical coating or structural design of the beam splitter 08, the beam splitter 08 can switch the outgoing light beam between a reflection state and a refraction state. In the reflection state, the beam splitter 08 reflects the outgoing light beam to the second optical fiber 07; in the refraction state, the beam splitter 08 allows the outgoing light beam to pass through and refract to the first optical fiber 06.

[0080] In order to switch between the reflective state and the refractive state, the optical properties of the beam splitter 08 can be changed by an electromagnetic driver or a piezoelectric element. For example, by changing the electric field or magnetic field inside the beam splitter 08, the refractive index or optical path length of the beam splitter 08 is changed, thereby switching between the reflective state and the refractive state. In addition, other methods can also be used to change the optical properties of the beam splitter 08, such as using thermal effects to change the temperature of the beam splitter 08, thereby changing the refractive index of the beam splitter 08; or using a mechanical device to move or rotate the lens to change the reflection path and refraction path of the light beam.

[0081] See also Fig.11 A second aspect of the present application provides a light measurement method, comprising:

[0082] 101. The control wheel turns to rotate, and when the shooting lens is coaxial with the incident light beam, the control light processing module acquires an image of the incident light beam passing through the shooting lens.

[0083] The light processing module is an optical color light processing module. A shooting lens and a measuring plate are arranged on the rotating disk. A reflecting prism is arranged on the measuring plate. By controlling the rotation of the rotating disk, the shooting lens or the reflecting prism can be selected to be coaxial with the incident light beam. The incident light beam is emitted from the object to be measured or formed by reflection from the object to be measured. The rotating disk is controlled to rotate. When it rotates to the point where the shooting lens and the incident light beam are coaxial, the incident light beam can pass through the shooting lens to reach the light processing module. At this time, the light processing module can obtain an image of the incident light beam. The light processing module has an image sensor and a data processing module. The image is obtained through the sensor, and the image is analyzed and processed by the data processing module, so as to obtain the color brightness value of the image.

[0084] 102. Calculate first color brightness values ​​of all pixels in the image, where the first color brightness values ​​at least include a center point brightness value of a center pixel of the image.

[0085] Each pixel in an image has a color brightness value, which is used to represent the brightness and color information of the pixel; for each pixel in the image, its color brightness value is calculated through image processing algorithms (such as histogram statistics, color space conversion, etc.). The calculation process also involves converting the image from the RGB color space to other color spaces (such as HSV, Lab, etc.), so that the brightness and color information can be extracted more conveniently.

[0086] The center point brightness value is the brightness value corresponding to the image at the center position of the image. First, the color brightness value (including brightness value and chromaticity value) of each pixel is calculated, and then the center point of the image is located, and the color brightness value corresponding to the center point is extracted, and the brightness value in the color brightness value of the point is extracted.

[0087] 103. The control wheel turns to rotate so that the reflecting prism is coaxial with the incident light beam, and the incident light beam forms an outgoing light beam coaxial with the light splitting component after passing through the reflecting prism.

[0088] After the image of the incident light beam is acquired by the light processing module in step 102, the rotating disk is continuously controlled to rotate so that the reflecting prism is coaxial with the incident light beam, and the incident light beam is reflected by the reflecting prism to form an outgoing light beam coaxial with the light splitting component.

[0089] The function of the reflecting prism is to change the propagation direction of the incident light beam. When the incident light beam hits the mirror surface of the reflecting prism, the light beam will be reflected to another direction (the direction coaxial with the beam splitter component) according to the law of reflection; the outgoing light beam retains the brightness and color information of the incident light beam.

[0090] The spectrometer component is connected to an interface via a first optical fiber, and the interface can be connected to an external spectrometer. The spectrometer component is also connected to a built-in internal spectrometer via a second optical fiber. After the outgoing light beam passes through the spectrometer component, it can be guided into the first optical fiber and the second optical fiber at the same time, or it can be guided into the first optical fiber or the second optical fiber as required. The measurement accuracy of the external spectrometer is higher than the measurement accuracy of the built-in first spectrometer, and the external spectrometer is superior to the internal spectrometer in sensitivity, resolution, stability, and measurement range.

[0091] 104. Compare the preset brightness threshold with the center point brightness value, and determine the target spectrometer according to the comparison result.

[0092] The preset brightness threshold is set according to the measurement range of the built-in internal spectrometer, and is used to accurately determine the brightness value of the center point during the comparison process, and to determine whether the built-in internal spectrometer can perform high-precision measurement of the outgoing light beam in the current environment. The unit of the brightness value is nit. For example, the brightness value of the center point measured by the light processing module is 0.21nit, while the measurement accuracy of the built-in internal spectrometer can only achieve one decimal place (0.1nit), and the measurement range of the internal spectrometer is 1.0-50nit. Therefore, if the outgoing light beam (formed by the reflection of the incident light beam) is measured by the internal spectrometer, the measurement accuracy will not meet the requirements, and there will be a large error.

[0093] In this embodiment, the target spectrometer is determined by comparing the results, and the target spectrometer is determined from the internal spectrometer and the external spectrometer. Based on the brightness value of the center point of the image acquired in step 102, the brightness value of the center point is compared with the preset brightness threshold. If the brightness value of the center point is higher than the brightness threshold, it means that the range of the internal spectrometer meets the measurement of the incident light beam, and a built-in internal spectrometer with lower accuracy can be selected for measurement; if the brightness value of the center point is lower than the brightness threshold, it means that the measurement range of the internal spectrometer cannot meet the measurement of the incident light beam. At this time, an external high-precision external spectrometer is required for light measurement. Since the brightness measurement range supported by the built-in internal spectrometer is relatively limited, when the light beam brightness is low, the accuracy of the spectral data measured by the internal spectrometer is low, and it is not suitable for chromaticity calibration of the light processing module. Therefore, an external spectrometer with higher accuracy and larger range needs to be selected for measurement to achieve high-precision chromaticity measurement.

[0094] When there is no need to connect an external spectrometer, the interface is in an empty state. When the brightness is low, the external spectrometer can be connected to the interface, and the outgoing light beam is guided to the external spectrometer through the first optical fiber for spectral measurement.

[0095] The setting of the brightness threshold is different according to the specifications of different colorimeter. For example, the range of the built-in spectrometer of some colorimeter is 0.1-50nit, and the brightness threshold can be set to 0.10. With 0.10 as the limit, if the central point brightness value measured by the light processing module is greater than or equal to 0.10, the built-in spectrometer can be used for spectrum measurement and calibration. If it is less than 0.10, an external high-precision spectrometer is required for spectrum measurement and calibration. For another example, if the range of the built-in spectrometer is 2-100nit, 2nit can be set as the brightness threshold.

[0096] 105. Control the light splitting component to guide the outgoing light beam to the target spectrometer, and collect the second color brightness value of the center point of the outgoing light beam through the target spectrometer.

[0097] The light splitting component can be a beam splitter, a beam splitter, etc. When a beam splitter is used, the optical properties of the beam splitter are controlled by electrical, magnetic, etc. methods, so that the beam splitter reflects or refracts the incident light beam into the second optical fiber, or refracts into the first optical fiber. When a beam splitter is used, the input end of the beam splitter is coaxial with the output light beam, and the output end of the beam splitter is connected to the first optical fiber and the second optical fiber at the same time, so that the incident light beam can be guided into the first optical fiber and the second optical fiber at the same time.

[0098] Based on the target spectrometer determined in step 104, if the target spectrometer is a built-in internal spectrometer, the incident light beam is guided into the second optical fiber through the spectrometer component, so that the internal spectrometer performs spectral measurement on the outgoing light beam; if the target spectrometer is an external high-precision external spectrometer, the external spectrometer is connected to the interface, and then the incident light beam is guided into the first optical fiber through the spectrometer component, so that the external spectrometer performs spectral measurement on the outgoing light beam.

[0099] After the target spectrometer performs spectral measurement on the outgoing light beam, a second color brightness value is obtained. The second color brightness value is the color brightness value of the center point of the outgoing light beam. Since the reflecting prism is coaxial with the incident light beam, the reflecting prism reflects the center point light beam of the incident light beam into the beam splitting component, and the second color brightness value is the color brightness value of the center point of the incident light beam.

[0100] 106. Calibrate the brightness value of the first color based on the brightness value of the second color to obtain a target color brightness value, and derive the target color brightness value.

[0101] In optical measurement systems, due to equipment differences (such as the sensitivity and resolution of the spectrometer), environmental interference (such as temperature, humidity, electromagnetic interference, etc.), etc., errors may occur in the measured color brightness values.

[0102] In step 105, the second color brightness value of the center point of the outgoing light beam has been obtained through the acquisition of the spectroscopic component and the target spectrometer; the center point color brightness value (i.e., the color brightness value corresponding to the center pixel of the image captured by the light processing module) is compared and calibrated with the second color brightness value, the center point color brightness value is calibrated by the second color brightness value, and then based on the calibrated center point color brightness value, the color brightness values ​​of all pixels on the image are calibrated, and after the calibration is completed, the target color brightness value is obtained, the target color brightness value is the color brightness value corresponding to each pixel on the image (after calibration), and finally the target color brightness value is exported. It should be noted that the measured first color brightness value and second color brightness value are exported together.

[0103] The export method includes saving to a storage device (such as a hard disk, a USB flash drive, etc.), transmitting to a remote server or a display device.

[0104] The exported target color brightness values ​​can be further processed and analyzed, such as drawing spectral curves, calculating spectral intensity distribution, and performing spectral matching.

[0105] In this embodiment, the first color brightness value obtained by the light processing module is calibrated by using the second color brightness value measured by the target spectrometer to eliminate the measurement error and obtain a more accurate target color brightness value. And according to the brightness value of the image taken by the light processing module, it is determined whether to use the built-in internal spectrometer or the external high-precision external spectrometer to meet the measurement of different measurement environments.

[0106] Based on the brightness value of the image taken by the light processing module, determine whether the spectral data of the built-in internal spectrometer is accurate and whether it can be used for the color calibration of the light processing module. If not, replace the spectral data source and obtain spectral data from an external high-precision spectrometer for color calibration of the light processing module to achieve high-precision measurement of chromaticity.

[0107] See also Fig.12 , the measurement process of the optical measurement method of this application is:

[0108] 201. The lens receives an incident light beam. In this step, the incident light beam is emitted from the object to be measured, passes through the lens, and the lens is aimed at the object to be measured.

[0109] 202. The shooting lens is coaxial with the incident light beam. In this step, the rotating disk needs to be controlled to rotate to the shooting position so that the shooting lens is coaxial with the incident light beam, and the incident light beam passes through the shooting lens and reaches the light processing module.

[0110] 203. The light processing module captures an image of the incident light beam. The light processing module captures an image of the incident light beam passing through the shooting lens to obtain an image, and performs analysis and processing on the image. One is to calculate the color brightness value corresponding to each pixel in the image (i.e., execute step 204), and the other is to extract the brightness value corresponding to the pixel at the center point of the image (i.e., execute step 205).

[0111] 204. Calculation of color brightness values ​​of all pixels; in this step, the color brightness values ​​of all pixels in the obtained image are calculated to obtain the color brightness values ​​preliminarily measured by the light processing module. After this step is completed, the color brightness values ​​are transmitted back to the control module, that is, step 211 is executed.

[0112] 205. Extracting the brightness of the central pixel of the image: In this step, the brightness value of the pixel corresponding to the central point of the image is extracted, which is called the central point brightness value.

[0113] 206. The reflecting prism is coaxial with the incident light beam. The above has completed the imaging of the light processing module, and then the incident light beam needs to be guided to the spectrometer for spectral measurement. Therefore, in this step, the rotary disk is continued to be controlled to rotate so that the rotary disk is in the measuring position. At this time, the incident light beam is coaxial with the reflecting prism, and the incident light beam is reflected by the reflecting prism. The reflected light beam is called the outgoing light beam.

[0114] 207. The light splitting component splits the light into two optical fibers; the outgoing light beam is coaxial with the arrangement direction of the light splitting component, so when the outgoing light beam reaches the light splitting component, the light splitting component splits the outgoing light beam into two and transmits them to two optical fibers (the first optical fiber and the second optical fiber) at the same time. The light splitting component can also transmit at different times and guide the outgoing light beam to the appropriate first optical fiber or second optical fiber according to needs.

[0115] 208, brightness value determination: In this step, based on a preset brightness threshold, the center point brightness value extracted in step 205 is compared with the preset brightness threshold. When the center point brightness value is greater than the brightness threshold, step 209 is executed. When the center point brightness value is less than the brightness threshold, step 210 is executed. The brightness threshold is related to the measurement accuracy and measurement range of the built-in internal spectrometer.

[0116] 209. Built-in internal spectrometer measurement; when the central point brightness value is greater than the brightness threshold, it means that the measurement range and accuracy of the built-in internal spectrometer can meet the calibration of the measurement value of the light processing module. At this time, the built-in internal spectrometer is used to measure the spectrum of the outgoing light beam, and the measurement result is used to correct the color brightness value of all pixels measured by the light processing module.

[0117] 210. External spectrometer measurement: When the central point brightness value is less than the brightness threshold, it means that the measurement range and accuracy of the built-in internal spectrometer cannot meet the calibration of the measurement value of the light processing module. At this time, a higher-precision external spectrometer is connected through the interface for spectral measurement and calibration.

[0118] 211. Data is transmitted back to the control module. In this step, the spectrum data (including the color brightness value of the outgoing light beam) measured by the spectrometer (internal spectrometer or external spectrometer) is transmitted to the control module.

[0119] 212. Calibrate the values ​​of the light processing module using the spectral data. The control module corrects the color brightness values ​​of all pixels collected by the light processing module based on the spectral data.

[0120] 213. Export all color and brightness data.

[0121] It should be noted that the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dual-path spectrally corrected imaging colorimeter, characterized in that: include: A housing, a control module, an internal spectrometer, a light processing module, a rotating disk, a lens, a first optical fiber, a second optical fiber and a light splitting component; The control module, the internal spectrometer and the light processing module are all arranged in the housing, and the control module is electrically connected to the internal spectrometer and the light processing module respectively; the lens is arranged on the housing, and the lens is used to transmit an incident light beam, and the incident light beam is transmitted along the lens into the housing, and an optical path connection is formed between the lens and the light processing module; the rotating disk and the light splitting component are both arranged on the housing, and the rotating disk is located between the lens and the light processing module, an interface is arranged on the housing, the interface and the light splitting component are connected through the first optical fiber, the internal spectrometer and the light splitting component are connected through the second optical fiber, and the interface is used to connect with an external spectrometer; The rotating disk is provided with a photographing lens and a reflecting prism, and the rotating disk is controlled to rotate. When the rotating disk rotates to the point where the photographing lens and the incident light beam are coaxial, the incident light beam passes through the photographing lens and reaches the light processing module; When the rotating disk rotates until the reflecting prism is coaxial with the incident light beam, the incident light beam is reflected by the reflecting prism to form an outgoing light beam coaxial with the beam splitting component, and the beam splitting component is used to introduce the outgoing light beam into the first optical fiber and / or the second optical fiber.

2. The imaging colorimeter according to claim 1, characterized in that: The light splitting component is an optical fiber plug and a fixing seat, the fixing seat is fixed on the housing, the optical fiber plug is fixed on the fixing seat, and the optical fiber plug is coaxial with the outgoing light beam; The first optical fiber and the second optical fiber are both arranged in the optical fiber plug, the first optical fiber is tangent to the second optical fiber, and the tangent point is aligned with the axis of the outgoing light beam.

3. The imaging colorimeter according to claim 2, characterized in that: The core diameter of the first optical fiber is greater than the core diameter of the second optical fiber.

4. The imaging colorimeter according to claim 2 or 3, characterized in that: The first optical fiber and the second optical fiber are both single-core optical fibers.

5. The imaging colorimeter according to claim 1, wherein: The splitting component is a splitter, the first optical fiber is connected to the output end of the splitter, the second optical fiber is connected to the output end of the splitter, a third optical fiber extends outward from the input end of the splitter, the third optical fiber is coaxial with the output light beam, and the splitter is used to guide the output light beam into the first optical fiber and the second optical fiber at the same time.

6. The imaging colorimeter according to claim 1, characterized in that: The spectroscopic component includes a track and a position switching seat, the track is arranged on the shell, the position switching seat is arranged on the track, the first optical fiber and the second optical fiber are arranged side by side on the position switching seat, and the position switching seat is controlled to move along the track so that the first optical fiber or the second optical fiber is coaxial with the output light beam.

7. The imaging colorimeter according to claim 6, characterized in that: The track is a straight track, and the straight track is perpendicular to the emergent light beam.

8. The imaging colorimeter according to claim 1, wherein: The light splitting component is a beam splitter, which includes a reflection state and a refraction state. The beam splitter is controlled to switch between the reflection state and the refraction state. In the reflection state, the outgoing light beam reaches the second optical fiber after being reflected by the beam splitter, and in the refraction state, the outgoing light beam reaches the first optical fiber after being refracted by the beam splitter.

9. A light measurement method, applied to the imaging colorimeter according to any one of claims 1 to 8, characterized in that: The light measurement method comprises: The control wheel turns to rotate, and when the shooting lens is coaxial with the incident light beam, the control light processing module acquires the image of the incident light beam passing through the shooting lens; Calculating first color brightness values ​​of all pixels in the image, wherein the first color brightness values ​​at least include a center point brightness value of a center pixel of the image; Controlling the rotating disk to rotate so that the reflecting prism is coaxial with the incident light beam, and the incident light beam forms an outgoing light beam coaxial with the light splitting component after passing through the reflecting prism; Comparing the brightness value of the center point with a preset brightness threshold, and determining a target spectrometer according to the comparison result; Controlling the light splitting component to guide the outgoing light beam to the target spectrometer, and collecting the second color brightness value of the center point of the outgoing light beam through the target spectrometer; The first color brightness value is calibrated based on the second color brightness value to obtain a target color brightness value, and the target color brightness value is derived.

10. The light measurement method according to claim 9, characterized in that: Determining the target spectrometer according to the comparison result includes: If the brightness value of the center point is greater than the preset brightness threshold, determining that the built-in internal spectrometer is the target spectrometer; If the central point brightness value is less than the preset brightness threshold, it is determined that the external spectrometer connected to the interface is the target spectrometer, and the measurement accuracy of the external spectrometer is higher than the measurement accuracy of the internal spectrometer.

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