CN111141388A - Ring belt color meter and color measuring method - Google Patents
Ring belt color meter and color measuring method Download PDFInfo
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- CN111141388A CN111141388A CN202010022208.9A CN202010022208A CN111141388A CN 111141388 A CN111141388 A CN 111141388A CN 202010022208 A CN202010022208 A CN 202010022208A CN 111141388 A CN111141388 A CN 111141388A
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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Abstract
The application is suitable for the technical field of color measurement, and provides an annular belt color meter and a color measurement method, wherein the annular belt color meter comprises a shading shell, a continuous spectrum light source, a first color measurement device and a diffuse reflection surface, and the bottom of the shading shell is provided with a sampling aperture; the continuous spectrum light source is arranged on the inner side of the shading shell, avoids the position capable of directly irradiating the sampling aperture, and projects continuous spectrum light to the inner part of the shading shell; the first color measuring device is arranged right opposite to the detection aperture, receives diffuse reflection light of the sample at the sampling aperture and measures light intensity of the diffuse reflection light; the diffuse reflection surface directly irradiated by the continuous spectrum light source is attached to the inner wall of the shading shell. The light emitted by the continuous spectrum light source irradiates the sampling aperture through diffuse reflection of the diffuse reflection surface, so that the controllability of the structure and the size of the color measuring instrument is improved; the size of the annular color measuring instrument can be made very small because the light path is folded; the light irradiating the sample is more uniform, and the reproducibility of the instrument is improved.
Description
Technical Field
The application relates to the technical field of color measurement, in particular to an annular belt color meter and a color measurement method.
Background
The annular colorimeter is an instrument for measuring the color of an object by the reflected color of the object. For non-luminous opaque objects, the color depends on the degree of absorption and reflection of the object itself for each band of colored light. In the actual measurement process, factors influencing the color measurement result of the object depend on the light emission spectrum of the light source, the performance parameters of the color sensor, the relative position relationship between the sample and the light source and the color sensor, namely the geometric conditions of the colorimeter for reflection measurement, besides the object itself.
The CIE (Commission Internationale de l' Eclairage) specifies ten reflection measurement geometries, of which the 45 ° annulus/vertical geometry is one. The lighting and observation conditions under the condition are very suitable for the situation that human eyes actually observe the printed matter, so that the method is very suitable for measuring the color in the printing industry.
The 45 degree zone/vertical zone colorimeter requires irradiation of an annular light source obliquely above a sample, the sample is illuminated by one or more beams of light, the axis of the illuminating beam and the normal of the surface of the sample form an angle of 45 degrees +/-5 degrees, the included angle between the observation direction and the normal of the surface of the sample is not more than 10 degrees, and the included angle between any beam of the illuminating beam and the axis thereof is not more than 5 degrees. By adopting the 45-degree annular zone/vertical-condition annular zone colorimeter, the influence of specular reflection light on the surface of the sample on detection equipment can be effectively excluded, and meanwhile, the influence of the texture and direction selective reflection of the sample can be reduced to the minimum.
The 45 degree zone/vertical color measurement condition depends on an annular light source, in the traditional scheme, in order to realize the 45 degree zone/vertical condition, an illuminating element of the zone color measurement instrument needs to uniformly irradiate a sample at an incident angle of 40-50 degrees, so parameters such as the size, the relative position and the posture of the sample are always fixed, namely, the parameters need to be matched with the size of the illuminating element, the size of the whole zone color measurement instrument is uncontrollable, and the lightweight and miniaturization of the 45 degree zone/vertical zone color measurement instrument are not facilitated.
Disclosure of Invention
The application aims to provide an annulus colorimeter, and aims to solve the technical problems that the size of a traditional 45-degree annulus/vertical colorimeter is uncontrollable, and the size is large and the cost is high.
The application is realized in such a way that the annular band colorimeter comprises a shading shell, a continuous spectrum light source, first color measuring equipment and a diffuse reflection surface; the bottom of the shading shell is provided with a sampling aperture for taking color from a sample; the continuous spectrum light source is arranged on the inner side of the shading shell, is arranged at a position where the continuous spectrum light source can be directly irradiated to the sampling aperture and is used for projecting continuous spectrum light into the shading shell; the first color measuring device is arranged right opposite to the sample and used for receiving the diffuse reflection light of the sample at the sampling aperture and measuring the color of the diffuse reflection light; the diffuse reflection surface is attached to the inner wall of the shading shell and is directly irradiated by the continuous spectrum light source and used for diffusely reflecting the continuous spectrum light to the sampling aperture.
In an embodiment of this application, the clitellum color meter still includes the diaphragm sleeve, the diaphragm sleeve set up in the shading shell is inboard, with the top of shading shell is connected, the telescopic bottom of diaphragm is aimed at sampling aperture, first colour measuring equipment set up in the diaphragm sleeve is inboard, the diaphragm sleeve forms and is used for supplying the diffuse reflection light of sample passes and shines first colour measuring equipment's detection aperture, just the continuum light source dodges and to be able direct irradiation survey the aperture with sampling aperture's position sets up.
In an embodiment of this application, the continuum light source encircles the setting of diaphragm sleeve, just the continuum light source set up in shading shell top, the diffuse reflection face encircles the inside wall setting of shading shell.
In an embodiment of the present application, the diffuse reflection surface is further attached to a top surface of an inner side of the light shielding shell, and the aperture sleeve and the diffuse reflection surface define an incident angle of diffuse reflection light illuminating the sampling aperture to be 40 ° to 50 °.
In one embodiment of the present application, the surface of the diaphragm sleeve is black, and a portion of the inner side of the light shielding case where the diffuse reflection surface is not disposed is black.
In an embodiment of the present application, the diffuse reflection surface is composed of a diffuse reflection membrane attached to an inner side of the light shielding shell, and a groove for accommodating the diffuse reflection membrane is disposed on an inner side surface of the light shielding shell.
In an embodiment of the present application, the annulus colorimeter further includes a second color measuring device for measuring the intensity of the reflected light of the diffuse reflection surface, the second color measuring device being disposed inside the opaque housing, and the second color measuring device avoiding being capable of directly observing the sampling aperture and the position of the continuum light source.
In one embodiment of the present application, the continuum light source and the second color measurement device are juxtaposed on top of an inside of the blackout housing.
Another object of the present application is a color measurement method suitable for use in an annular zone colorimeter as described above for measuring reflectance values of a sample, comprising:
acquiring calibration parameters: the annular color measuring instrument measures a standard sample and records the reflected light intensity of the standard sample obtained by the first color measuring device and the reflected light intensity of the diffuse reflection surface obtained by the second color measuring device when the standard sample is measured;
obtaining light intensity: the annular color measuring instrument receives the reflected light intensity of the diffuse reflection surface acquired by the second color measuring device and the reflected light intensity of the sample acquired by the first color measuring device;
solving the reflectivity of the sample: and the annular color photometer solves the light source attenuation rate of the continuous spectrum light source according to the reflected light intensity of the diffuse reflection surface and the reflected light intensity of the sample, and corrects the reflected light intensity of the sample according to the light source attenuation rate.
In an embodiment of the present application, in the step of obtaining the calibration parameter, the standard sample includes a standard white board and a standard black board, and the step of obtaining the calibration parameter specifically includes:
the annular color measuring instrument measures a standard white board, receives the reflected light intensity of the standard white board obtained by the first color measuring equipment and the reflected light intensity of the diffuse reflection surface obtained by the second color measuring equipment when the standard white board is measured;
the annulus colorimeter measures a standard blackboard, receives the reflected light intensity of the standard blackboard acquired by the first color measuring device and the reflected light intensity of the diffuse reflection surface acquired by the second color measuring device during measurement of the standard blackboard.
The implementation of the utility model provides a color meter is taken to ring has following beneficial effect at least:
part of the inner side wall of the shading shell is provided with a diffuse reflection surface, light rays emitted by the continuous spectrum light source irradiate the diffuse reflection surface, the illumination of the inner space of the whole shading shell is realized through diffuse reflection, the surface of the sample is further illuminated, the surface color of the sample is detected by first color measurement equipment, and specific parameters of the surface color of the sample can be obtained; the continuous spectrum light source is arranged in a position where the continuous spectrum light source can directly irradiate the sampling aperture, uniform illumination on the sample is realized by irradiating the diffuse reflection surface, and the incident angle of the continuous spectrum light source when irradiating the sample can be controlled by setting the specific shape and position of the diffuse reflection surface. Thus, the annular color measuring instrument realizes the annular light uniform illumination of 40-50-degree incident angles of the sample through the diffuse reflection surface, does not need to specially arrange the size of the continuous spectrum light source and the relative position and the relative posture of the continuous spectrum light source and the sample, can realize the 45-degree annular/vertical color measuring condition specified by CIE, and further improves the controllability of the structure and the size of the annular color measuring instrument; moreover, light rays emitted by the continuous spectrum light source are irradiated to the sampling aperture after being subjected to diffuse reflection of the diffuse reflection surface, and the sample is subjected to uniform illumination of the annular band with the incident angle of 40-50 degrees; in addition, light rays emitted by the continuous spectrum light source irradiate the sampling aperture after being subjected to diffuse reflection by the diffuse reflection surface, and the diffuse reflection surface has a light equalizing effect, so that light spots irradiated on a sample are more uniform, and the accuracy of a measuring result of an instrument is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of the construction of an annular zone colorimeter according to one embodiment of the present application;
FIG. 2 is a schematic cross-sectional view of a portion of the color measuring instrument shown in FIG. 1 for color measurement;
FIG. 3 is an exploded schematic view of the portion of the zonal colorimeter shown in FIG. 1 for color measurement;
FIG. 4 is a schematic view of the top of the light shielding case of the annular colorimeter shown in FIG. 1;
FIG. 5 is a schematic view of the color measurement principle of the annular zone color meter shown in FIG. 2;
fig. 6 is a schematic flow chart of a color measurement method according to an embodiment of the present application.
Reference numerals referred to in the above figures are detailed below:
11-a light-shielding shell; 110-a diffusive reflective surface; 1101-a snap-fit structure; 111-sampling aperture; 112-a detection aperture; 113-a groove; 12-a continuum light source; 131-a first color measurement device; 132-a second color measurement device; 14-a diaphragm sleeve; 2-sample; 3-a wireless connection module; 4-a power supply module; and 5, a control module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
In order to explain the technical solutions of the present application, the following detailed descriptions are made with reference to specific drawings and examples.
Referring to fig. 2 to 4, the present application is embodied in a color measuring apparatus including a light shielding case 11, a continuum light source 12, a first color measuring device 131, and a diffuse reflecting surface 110; the bottom of the shading shell 11 is provided with a sampling aperture 111 for taking color from the sample 2; the continuum light source 12 is arranged inside the shading shell 11, and the continuum light source 12 is arranged at a position which can be directly irradiated to the sampling aperture 111 in an avoiding manner and is used for projecting continuum light into the shading shell 11; the first color measuring device 131 is disposed facing the sample 2, and is configured to receive the diffusely reflected light of the sample 2 at the sampling aperture 111 and measure the light intensity of the diffusely reflected light; the diffuse reflection surface 110 is attached to the inner wall of the light shielding shell 11, and the diffuse reflection surface 110 is directly irradiated by the continuum light source 12 and is used for diffusely reflecting the continuum light to the sampling aperture 111.
Specifically, the annular color meter provided in this embodiment operates as follows:
referring to fig. 5, the sampling aperture 111 is aligned with the sample 2, the continuum light source 12 transmits continuum light into the light shielding shell 11, and the continuum light illuminates the entire internal space of the light shielding shell 11 under the diffuse reflection action of the diffuse reflection surface 110 attached to the inner wall of the light shielding shell 11, so as to illuminate the surface of the sample 2; while the light illuminates the surface of the sample 2 at an incident angle of 45 °, diffuse reflection occurs again at the surface of the sample 2, part of the diffuse reflection light is received by the first color measuring device 131, and the first color measuring device 131 can obtain specific parameters of the color of the surface of the sample 2 through analysis according to the received diffuse reflection light.
The implementation of the annular belt color measuring instrument provided by the embodiment can at least achieve the following beneficial effects:
part of the inner side wall of the shading shell 11 is provided with a diffuse reflection surface 110, light rays emitted by the continuous spectrum light source 12 irradiate the diffuse reflection surface 110, illumination of the whole inner space of the shading shell 11 is realized through diffuse reflection, the surface of the sample 2 is further illuminated, the surface color of the sample 2 is detected by the first color measuring equipment 131, and specific parameters of the surface color of the sample 2 can be obtained; the continuum light source 12 is arranged so as to avoid the position where the sample aperture 111 can be directly irradiated, but the diffuse reflection surface 110 is irradiated to realize uniform illumination on the sample 2, and further, the specific shape and position of the diffuse reflection surface 110 are arranged to control the incident angle when the sample 2 is irradiated by the light emitted from the continuum light source 12. Thus, the annular color measuring instrument realizes the annular light uniform illumination of the 40-50-degree incident angle of the sample 2 through the diffuse reflection surface, the 45-degree annular/vertical color measuring condition specified by CIE can be realized without specially arranging the size of the continuous spectrum light source 12 and the relative position and the relative posture of the continuous spectrum light source 12 and the sample 2, and the controllability of the structure and the size of the annular color measuring instrument is further improved; moreover, the light emitted by the continuum light source 12 is diffused by the diffuse reflection surface 110 and then irradiates the sampling aperture 111, and the sample is uniformly illuminated in a zone with an incident angle of 40-50 degrees. The light emitted by the continuum light source 12 is diffused by the diffuse reflection surface 110 and then irradiates the sampling aperture 111, and the diffuse reflection surface 110 has a light-equalizing function, so that light spots irradiating the sample 20 are more uniform, and the accuracy of the measurement result of the instrument is improved.
Referring to fig. 2 to 4, in an embodiment of the present application, the annular colorimeter further includes an aperture sleeve 14, the aperture sleeve 14 is disposed inside the light shielding shell 11 and connected to the top of the light shielding shell 11, the bottom of the aperture sleeve 14 is aligned with the sampling aperture 111, the first color measuring device 131 is disposed inside the aperture sleeve 14, and the aperture sleeve 14 forms a detection aperture 112 through which the diffuse reflection light of the sample 2 passes and irradiates the first color measuring device 131.
The diaphragm sleeve 14 is arranged to shield the light of the continuous spectrum light source 12 directly irradiating the sampling aperture 111, so as to prevent the continuous spectrum light from directly projecting on the sample 2, thereby reducing or even avoiding the mirror reflection effect on the surface of the sample 2 and the fluorescence effect on the surface of the sample 2 under the irradiation of ultraviolet rays, avoiding the uneven irradiation brightness on the surface of the sample 2, and finally improving the accuracy of the measurement result; the aperture sleeve 14 may also be used to limit the range of the incident angle of the light when the diffuse reflection surface 110 illuminates the sampling aperture 111, so as to facilitate the control of the incident angle of the continuous spectrum light; the diaphragm sleeve 14 also functions to control the field of view of the first color measuring device 131, prevent the first color measuring device 131 from detecting light at a position outside the sampling aperture 111, and ensure the accuracy of the measurement result of the first color measuring device 131.
Referring to fig. 2 to 4, in an embodiment of the present application, the continuum light source 12 is disposed around the diaphragm sleeve 14, the continuum light source 12 is disposed at the top of the light shielding shell 11, and the diffuse reflection surface 110 is disposed around the inner sidewall of the light shielding shell 11. The diaphragm sleeve 14 and the diffuse reflection surface 110 jointly act on the control of the incident light angle, so that a light path is conveniently designed to illuminate the sampling aperture 111 by 40-50 degrees; both the continuum light source 12 and the diffuse reflecting surface 110 are positioned around the sampling aperture 111 to improve the uniformity of illumination of the sampling aperture 111.
Referring to fig. 2 and 3, in an embodiment of the present application, the diffuse reflection surface 110 is further attached to the top surface of the inner side of the light shielding shell 11, and the aperture sleeve 14 and the diffuse reflection surface 110 define an incident angle of the diffuse reflection light illuminating the sampling aperture 111 to be 40 ° to 50 °.
As a specific aspect of this embodiment, the diffuse reflection surface 110 is disposed at a position where no other component is disposed at the top of the light shielding shell 11, light emitted from the continuum light source 12 can be irradiated to the sampling aperture 111 through multiple diffuse reflections, and the partial diffuse reflection surface 110 is also shielded by the aperture sleeve 14 and does not directly irradiate the sampling aperture 111, so that the light intensity and the uniformity of light rays for illuminating the sampling aperture 111 can be improved without destroying the 45 ° zone/vertical measurement condition.
In an embodiment of the present application, the surface of the diaphragm sleeve 14 is black, and the portion of the inner side of the light shielding shell 11 where the diffuse reflection surface 110 is not disposed is black, so that the incident angle when the continuum light irradiates the sampling aperture 111 can be controlled within a range of 40 ° to 50 °, the 45 ° ring/vertical measurement condition is satisfied, the light from the outside of the sample 2 can be eliminated, and the interference of the color of the inner side of the light shielding shell 11 on the measurement result of the first color measurement device 131 can be prevented.
Referring to fig. 2 and 3, in an embodiment of the present application, the diffuse reflection surface 110 is composed of a diffuse reflection film attached to the inner side of the light shielding shell 11, so that the extinction process of the inner wall of the light shielding shell 11 can be simplified, and the production and manufacture of the diffuse reflection surface 110 and the annular colorimeter can be simplified; the inner side of the shading shell 11 is provided with a groove 113 for accommodating the diffuse reflection membrane, so that the assembly of the annular belt color meter is further simplified.
In the embodiment, the diffuse reflection membrane adhered to the inner side of the shading shell 11 is adopted, so that the manufacturing process of the diffuse reflection surface 110 and the manufacturing process of the annular color measuring instrument can be simplified, only the whole shading shell 11 needs to be subjected to extinction treatment, and then the diffuse reflection membrane is arranged on the groove 113 in the inner side wall of the shading shell 11; and the diffuse reflection material is not left at the position needing extinction processing on the inner side wall of the shading shell 11, so that the light can be prevented from being reflected by other positions of the inner wall of the shading shell 11 and then directly irradiating the first color measuring equipment 131, the incident angle of the diffuse reflection light of the continuous spectrum light source 12 when irradiating the sample 2 is strictly controlled, the cost is reduced, the boundary of the diffuse reflection surface 110 is sharper, the uniformity of the light intensity angle distribution irradiating the surface of the sample 2 to be measured is also improved, and the accuracy of the measurement result of the annular color measuring instrument is finally improved.
As a specific solution of this embodiment, the diffuse reflection film is prepared by die cutting process, and is provided with the fastening structure 1101, so as to be capable of being fastened end to end into a ring shape, thereby further simplifying the manufacturing process and the assembly of the annular belt colorimeter.
As a preferable scheme of this embodiment, the diffuse reflection film is an Ultraviolet (UV) resistant film, that is, the diffuse reflection film is provided with an ultraviolet-proof layer, so that ultraviolet band light in the continuum light source 12 can be prevented from irradiating the sample 2, and the sample 2 emits fluorescence under excitation of ultraviolet rays, which affects accuracy of a detection result.
Referring to fig. 2, as a preferred embodiment of the present embodiment, after the diffuse reflection film is installed in place, the included angle between the conical curved surface where the diffuse reflection film is located and the central normal line of the sampling aperture 111 is 5 °, so that the light intensity when the light emitted by the continuous spectrum light source 12 is reflected to the sampling aperture 111 through the diffuse reflection film can be improved, the received signal intensity of the first color measurement device 131 is improved, the first color measurement device 131 can obtain the best responsivity, which is beneficial to the processing of the reflected light signal of the sample 2 by the annular color meter, and the stability of the measurement result of the annular color meter is improved.
Referring to fig. 2 to 4, in an embodiment of the present application, the annular colorimeter further includes a second color measuring device 132 for measuring the intensity of the reflected light of the diffuse reflection surface 110, the second color measuring device 132 is disposed so as to avoid the position where the sampling aperture 111 and the continuum light source 12 can be directly observed, and the second color measuring device 132 is disposed inside the light shielding shell 11.
The second color measuring device 132 is configured to receive and measure the diffuse reflection light of the diffuse reflection surface 110, further obtain the intensity of the light inside the light shielding shell 11 over the entire frequency band and monitor the change in real time, and correct the measurement result of the first color measuring device 131, thereby eliminating the influence of the change in the light intensity emitted by the continuum light source 12 on the measurement result of the first color measuring device 131 and the influence of the color of the sample 2 on the measurement result of the first color measuring device 131.
Referring to fig. 2 to 4, in an embodiment of the present application, the continuum light source 12 and the second color measurement device 132 are juxtaposed on the top of the inner side of the light-shielding shell 11, so that the light-shielding sleeve 14 shields the light directly irradiated to the second color measurement device 132 by the sampling aperture 111, thereby improving the accuracy of the result of the second color measurement device 132 measuring the color of the diffuse reflection surface 110.
As a specific aspect of the present embodiment, the first color measuring device 131 and/or the second color measuring device 132 employs photodetectors, and is capable of measuring the light intensity values of three colors among the reflected light intensities of the sample 2, respectively, and obtaining the color of the sample 2 by calculation.
Referring to fig. 2 to 4, as a specific solution of this embodiment, the second color measurement device 132 and the continuum light source 12 are disposed on the same PCB, which is convenient for optimizing the circuit layout of the annular color meter, and no separate light path needs to be provided for the second color measurement device, so as to simplify the structure of the annular color meter and reduce the cost thereof; meanwhile, since the fields of view of the second color measurement device 132 and the light source need to be avoided from the detection aperture 112 and the sampling aperture, the spectral change of the continuum light source 12 can be conveniently monitored by the second color measurement device 132, and the continuum light source 12 can be prevented from directly irradiating the second color measurement device 132. Preferably, the continuum light source 12 is composed of a plurality of light source elements surrounding the aperture sleeve, and the second color measurement device 132 is disposed at a position between two adjacent light source elements, so that the accuracy of the measurement result of the second color measurement device 132 can be further improved, and the correction effect of the measurement result of the second color measurement device 132 on the measurement result of the first color measurement device 131 can be further ensured.
Referring to fig. 1, in an embodiment of the present application, the annular color meter further includes a standard sample, a wireless connection module 3, a power module 4 and a control module 5, the power module 4 is configured to supply power to the entire annular color meter, preferably, includes a lithium battery and a charging interface, the control module 5 directly drives the continuous spectrum light source 12 to emit light, the first color measurement device 131 and the second color measurement device 132 are connected to the control module 5, during measurement, the control module 5 first lights the continuous spectrum light source 12, then simultaneously collects a light intensity value of the first color measurement device 131 and a light intensity value of the second color measurement device 132, and after collection, turns off the continuous spectrum light source 12 to save power, the control module 5 calculates a reflectance value of the sample 2 according to measured data and calibration data stored in the control module 5, and finally converts the reflectance value into a chromaticity value to be displayed, the standard sample is fixed on a base of the apparatus, which is convenient to calibrate the annular color meter at any time, thereby avoiding errors caused by aging of optical devices, rapid changes of ambient temperature, further improving accuracy, the base is on a main case, namely, the sample is connected to a bluetooth color meter, the blue tooth color meter can be connected to a bluetooth E19, the blue tooth measuring module △, the blue tooth measuring module 3 is connected to the blue tooth measuring module 3619, and connected to the blue tooth measuring module 3.
Another object of the present application is a color measurement method suitable for use in an annular colorimeter as described above for measuring reflectance values of a sample 2, comprising:
acquiring calibration parameters: the annular colorimeter measures the standard sample, and records the intensity of reflected light of the standard sample obtained by the first color measuring device 131 when the standard sample is measured, and the intensity of reflected light of the diffuse reflection surface 110 obtained by the second color measuring device 132 when the standard sample is measured;
obtaining light intensity: the annular colorimeter receives the intensity of the reflected light of the diffuse reflection surface 110 acquired by the second color measuring device 132 and the intensity of the reflected light of the sample 2 acquired by the first color measuring device 131;
solving for sample 2 reflectivity: the annular colorimeter solves the light source attenuation rate of the continuum light source 12 according to the reflected light intensity of the diffuse reflection surface 110 and the reflected light intensity of the sample 2, and corrects the reflected light intensity of the sample 2 according to the light source attenuation rate.
The color measurement method provided by the embodiment in real time can at least achieve the following beneficial technical effects:
since the optical environment inside the light shielding case 11 behind the sample 2 is prevented from being complicated, and the spectrum of the light emitted by the continuous spectrum light source 12 changes with time along with changes in conditions such as temperature, the measured value of the reflectivity of the sample 2 by the first color measuring device 131 has a certain error from the actual reflectivity value of the sample 2. Therefore, the second color measurement device 132 is introduced to correct the measurement result of the first color measurement device 131 by monitoring the intensity change of the continuous spectrum light in each frequency band inside the light shielding shell 11 in real time; and the calibration parameters are obtained by measuring the standard sample, and the measurement value obtained by the first color measurement device 131 is compensated, so that the error of the measurement result of the annular colorimeter for the sample 2 can be greatly reduced through twice approximation calculation.
As a preferable solution of this embodiment, the control module 5 is provided with a memory structure for storing the calibration parameters obtained in the step of obtaining the calibration parameters.
In an embodiment of the present application, in the step of obtaining the calibration parameter, the standard sample includes a standard white board and a standard black board, and obtaining the calibration parameter specifically includes:
the annular colorimeter measures the standard white board, and receives the reflected light intensity of the standard white board obtained by the first color measuring device 131 and the reflected light intensity of the diffuse reflection surface 110 obtained by the second color measuring device 132 when the standard white board is measured;
the annular colorimeter measures the standard blackboard, and receives the reflected light intensity of the standard blackboard acquired by the first color measuring device 131 and the reflected light intensity of the diffuse reflection surface 110 acquired by the second color measuring device 132 when measuring the standard blackboard.
As a preferable aspect of the present embodiment, the control module 5 is provided with a memory structure for storing the reflected light intensity of the standard white board acquired by the first color measuring device 131, the reflected light intensity of the diffuse reflection surface 110 acquired by the second color measuring device 132 when measuring the standard white board, the reflected light intensity of the standard blackboard acquired by the first color measuring device 131, and the reflected light intensity of the diffuse reflection surface 110 acquired by the second color measuring device 132 when measuring the standard blackboard.
As a specific aspect of this embodiment, the annular colorimeter corrects the light source attenuation rate. When the continuum light irradiates the sampling aperture 111 through the diffuse reflection surface 110, a part of the light irradiates the diffuse reflection surface 110 after being diffused by the sample 2, and irradiates the second color measurement device 132 after being diffused by the diffuse reflection surface 110, so that the detected light intensity of the second color measurement device 132 changes along with the change of the reflectivity of the sample 2 to be measured, and the correction of the light source attenuation rate helps to further improve the accuracy and reproducibility of the color measurement result of the sample 2 by the first color measurement device 131.
The following describes the color measurement method and its technical effects provided by this embodiment with a specific embodiment:
referring to fig. 6, in the present embodiment, the color measurement method includes:
s1: acquiring calibration parameters: the annular color meter measures the standard white board and receives the reflected light intensity I of the standard white board obtained by the first color measuring device 13111And the reflected light intensity I of the diffuse reflection surface 110 obtained by the second color measurement device 132 at the time of measuring the standard white board21The reflectivity of the standard white board is R1；
The annular color meter measures the standard blackboard and receives the reflected light intensity I of the standard blackboard acquired by the first color measuring device 13112And the reflected light intensity I of the diffuse reflection surface 110 acquired by the second color measurement device 132 when measuring a standard blackboard22Reflectance of standard blackboard is R2；
S2: obtaining light intensity: the annular colorimeter measures the sample 2, receives the reflected light intensity I of the sample 2 acquired by the first color measuring device 1311Obtaining a preliminary color measurement result R of sample 20(i.e., uncorrected sample 2 color detection results), and the reflected light intensity I of the diffuse reflection surface 110 obtained by the second color measurement device 132 while measuring the sample 22；
S3: solving for sample 2 reflectivity: the annular colorimeter solves the light source attenuation rate of the continuum light source 12 according to the reflected light intensity of the diffuse reflection surface 110 and the reflected light intensity of the sample 2, and corrects the reflected light intensity of the sample 2 according to the light source attenuation rate.
Specifically, solving for sample 2 reflectance includes:
the ring-belt color meter corrects the light source attenuation rate A, and specifically comprises the following steps:
where h is the coefficient of influence, R0As a result of color measurement of the uncorrected sample 2Specifically, the method comprises the following steps:
the final reflectance values for sample 2 were:
the optical environment inside the light shielding shell 11 is complex and affects the color measurement result of the first color measurement device. For example, as the conditions such as temperature change, the spectrum of the light emitted by the continuous spectrum light source 12 also changes with time, and the measured value of the reflectivity of the sample 2 by the first color measurement device 131 has a certain error from the actual reflectivity value of the sample 2; meanwhile, when the continuum light irradiates the sampling aperture 111 through the diffuse reflection surface 110, a part of the continuum light irradiates the diffuse reflection surface 110 after being diffusely reflected by the sample 2, and irradiates the first color measurement device 131 after being diffusely reflected by the diffuse reflection surface 110, which causes a certain error in a detection result of the first color measurement device 131. Therefore, the second color measurement device 132 is introduced to correct the variation error of the continuum light emitted by the continuum light source 12, and simultaneously, the error of the first color measurement device 131 itself caused by the diffuse reflection light of the sample 2 is corrected, and the two are combined to correct and compensate the measurement result of the first color measurement device 131, so that the error of the measurement result of the annular color measuring instrument for the sample 2 can be greatly reduced through twice approximation calculation.
It should be understood that the present embodiment provides the most complete color measurement method, and in the actual use process, after the step of obtaining the calibration parameters is performed on the annular colorimeter, the measurement may be performed multiple times, that is, in the actual use process, after the step of obtaining the calibration parameters, the steps of obtaining the light intensity and solving the reflectivity of the sample 2 may be performed multiple times, without performing a calibration before each color measurement of the sample 2.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. An annular belt colorimeter, comprising:
the device comprises a shading shell, a sampling hole and a color sampling device, wherein the bottom of the shading shell is provided with a sampling hole diameter for taking color from a sample;
the continuum light source is arranged on the inner side of the shading shell, can be arranged at a position where the continuum light source can be directly irradiated to the sampling aperture and is used for projecting continuum light into the shading shell;
the first color measuring device is arranged right opposite to the sample and used for receiving the diffuse reflection light of the sample at the sampling aperture and measuring the light intensity of the diffuse reflection light; and
and the diffuse reflection surface is attached to the inner wall of the shading shell, is directly irradiated by the continuous spectrum light source and is used for diffusely reflecting the continuous spectrum light to the sampling aperture.
2. The annular zone colorimeter according to claim 1 further comprising an aperture sleeve disposed inside the light shielding shell in connection with a top of the light shielding shell, a bottom of the aperture sleeve being aligned with the sampling aperture, the first color measuring device being disposed inside the aperture sleeve, the aperture sleeve forming a detection aperture for the diffusely reflected light of the sample to pass through and illuminate the first color measuring device, and the continuum light source avoiding a position setting capable of directly illuminating the detection aperture and the sampling aperture.
3. The annular belt colorimeter of claim 2 wherein the continuum light source is disposed around the diaphragm sleeve and the continuum light source is disposed on top of the opaque housing, the diffuse reflective surface being disposed around an inner sidewall of the opaque housing.
4. The annular belt colorimeter according to claim 3 wherein the diffuse reflective surface is further attached to a top surface of an inner side of the light shield housing, the aperture sleeve and the diffuse reflective surface defining an incident angle of diffuse reflected light impinging on the sampling aperture of from 40 ° to 50 °.
5. The annular belt colorimeter according to claim 2, wherein a surface of the diaphragm sleeve is black, and a portion of an inner side of the light shielding case where the diffuse reflection surface is not provided is black.
6. The annular colorimeter according to claim 2, wherein the diffuse reflection surface is composed of a diffuse reflection membrane attached to an inner side of the light shielding shell, and a groove for accommodating the diffuse reflection membrane is formed in an inner side surface of the light shielding shell.
7. The zonal colorimeter of any of claims 1-6 further comprising a second color measuring device for measuring the intensity of reflected light from the diffuse reflective surface, the second color measuring device being disposed inside the light-shielding housing, and the second color measuring device being disposed out of position to enable direct viewing of the sampling aperture and the continuum light source.
8. The annular belt colorimeter of claim 7 wherein the continuum light source and the second color measuring device are juxtaposed on top of an inside of the light shield.
9. A color measuring method for measuring a reflectance value of a sample, which is applied to the ring zone colorimeter according to claim 8, comprising:
acquiring calibration parameters: the annular color measuring instrument measures a standard sample and records the reflected light intensity of the standard sample obtained by the first color measuring device and the reflected light intensity of the diffuse reflection surface obtained by the second color measuring device when the standard sample is measured;
obtaining light intensity: the annular color measuring instrument receives the reflected light intensity of the diffuse reflection surface acquired by the second color measuring device and the reflected light intensity of the sample acquired by the first color measuring device;
solving the reflectivity of the sample: and the annular color photometer solves the light source attenuation rate of the continuous spectrum light source according to the reflected light intensity of the diffuse reflection surface and the reflected light intensity of the sample, and corrects the reflected light intensity of the sample according to the light source attenuation rate.
10. The color measurement method according to claim 9, wherein in the step of acquiring calibration parameters, the standard sample includes a standard white board and a standard black board, and the acquiring calibration parameters specifically includes:
the annular color measuring instrument measures a standard white board, receives the reflected light intensity of the standard white board obtained by the first color measuring equipment and the reflected light intensity of the diffuse reflection surface obtained by the second color measuring equipment when the standard white board is measured;
the annulus colorimeter measures a standard blackboard, receives the reflected light intensity of the standard blackboard acquired by the first color measuring device and the reflected light intensity of the diffuse reflection surface acquired by the second color measuring device during measurement of the standard blackboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010022208.9A CN111141388A (en) | 2020-01-09 | 2020-01-09 | Ring belt color meter and color measuring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010022208.9A CN111141388A (en) | 2020-01-09 | 2020-01-09 | Ring belt color meter and color measuring method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796523A (en) * | 2021-01-07 | 2021-05-14 | 中国建筑第五工程局有限公司 | Tool for color matching and color taking of building materials on construction site and color matching method |
| CN114427911A (en) * | 2021-10-21 | 2022-05-03 | 陈雨昕 | Color recognition device and method thereof |
| CN112796523B (en) * | 2021-01-07 | 2024-06-07 | 中国建筑第五工程局有限公司 | Tool and method for color matching and taking of construction site building materials |
-
2020
- 2020-01-09 CN CN202010022208.9A patent/CN111141388A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796523A (en) * | 2021-01-07 | 2021-05-14 | 中国建筑第五工程局有限公司 | Tool for color matching and color taking of building materials on construction site and color matching method |
| CN112796523B (en) * | 2021-01-07 | 2024-06-07 | 中国建筑第五工程局有限公司 | Tool and method for color matching and taking of construction site building materials |
| CN114427911A (en) * | 2021-10-21 | 2022-05-03 | 陈雨昕 | Color recognition device and method thereof |
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