CN111141387A - Color measuring instrument and color measuring method - Google Patents
Color measuring instrument and color measuring method Download PDFInfo
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- CN111141387A CN111141387A CN202010017776.XA CN202010017776A CN111141387A CN 111141387 A CN111141387 A CN 111141387A CN 202010017776 A CN202010017776 A CN 202010017776A CN 111141387 A CN111141387 A CN 111141387A
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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
- 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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- 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 a color measuring instrument and a color measuring method, wherein the color measuring instrument comprises an integrating sphere, a continuous spectrum light source, first color measuring equipment and a diffuse reflection membrane; the integrating sphere is provided with a sampling aperture for aligning a sample and a first detection aperture for the diffuse reflection light of the sample to pass through; the continuous spectrum light source is arranged right opposite to the inner space of the integrating sphere and used for projecting continuous spectrum light into the integrating sphere; the first color measuring device is arranged right opposite to the first detection aperture and used for receiving diffuse reflection light of the sample at the sampling aperture and measuring light intensity of the diffuse reflection light; the diffuse reflection diaphragm is attached to the inner wall of the integrating sphere, and a notch is formed in the position, corresponding to the sampling aperture and the first detection aperture, of the diffuse reflection diaphragm. The spraying step of the complex diffuse reflection coating can be avoided, the manufacturing process is simplified, the manufacturing cost is reduced, the diffuse reflection material cannot be left on the side walls of the sampling aperture and the first detection aperture, and the reproducibility of the color photometer is improved.
Description
Technical Field
The application relates to the technical field of color measurement, in particular to a color meter and a color measurement method.
Background
A color meter is an instrument that measures the color of an object by the reflected light 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. CIE (Commission Internationale de l' Eclairage, international Commission on illumination) specifies the geometry of ten reflectance measurements, where di: one of the geometrical conditions is the 8 ° (Diffusion: 8 °, Included, i.e. diffuse: 8 °, containing specular components). di: the 8-degree color measuring instrument comprises a segment-shaped integrating sphere, the bottom surface of the segment is a sampling aperture, a sample is aligned with the sampling aperture and receives uniform illumination from all directions of the inner surface of the integrating sphere, a measuring area is overfilled, a detector has uniform response to the sampling aperture area, and a receiving beam axis and a sample center normal form an angle of 8 degrees; and the radiation reflected by the sampling aperture should be uniform in all directions within 5 deg. of the receive beam axis. di: the result obtained by the measuring method of 8 degrees can effectively eliminate the influence of the surface structure of the sample, and is particularly important for the color measurement of samples such as textured paper, metal, textiles and the like.
Realizing di: an integrating sphere is required to be adopted under the geometric condition of 8 degrees, in the traditional scheme, the integrating sphere is manufactured by firstly manufacturing a spherical shell by using metal or plastic and then spraying a barium sulfate or magnesium oxide coating on the inner wall, so that the reproducibility of the measuring result of the color measuring instrument is poor easily caused by the manufacturing process problem of the integrating sphere, and the integral optical performance of the integrating sphere is influenced.
Disclosure of Invention
The application aims at providing a colorimeter, aims at solving traditional di: the reproducibility of the measurement result of the 8-degree color measuring instrument is poor.
The application is realized in such a way that a color meter comprises an integrating sphere, a continuous spectrum light source, a first color measuring device and a diffuse reflection membrane; the integrating sphere is provided with a sampling aperture for aligning a sample and a first detection aperture for allowing diffuse reflection light of the sample to pass through; the continuous spectrum light source is arranged right opposite to the inner space of the integrating sphere and used for projecting continuous spectrum light into the integrating sphere; the first color measuring device is arranged right opposite to the first detection aperture 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; the diffuse reflection membrane is attached to the inner wall of the integrating sphere, and a notch is formed in the position, corresponding to the sampling aperture and the first detection aperture, of the diffuse reflection membrane.
In an embodiment of the application, the integrating sphere is further provided with a light entrance aperture for limiting a light spot range which can be directly irradiated by the continuum light source in the integrating sphere, the continuum light source is arranged right opposite to the light entrance aperture, and the first detection aperture and the sampling aperture avoid the setting of the area which is directly irradiated by the continuum light source through the light entrance aperture on the inner wall of the integrating sphere.
In one embodiment of the present application, the colorimeter further includes a coupling lens for imaging the sample for measurement by the first color measurement device, the coupling lens being disposed between the first color measurement device and the first detection aperture.
In an embodiment of the present application, the colorimeter further includes a light equalizing glass, the light equalizing glass is disposed at a position where the coupling lens images the sample, and the first color measuring device is disposed right opposite to the light equalizing glass.
In one embodiment of the present application, the colorimeter further includes at least one imaging aperture disposed between the first color measurement device and the first detection aperture.
In an embodiment of the present application, the color meter further includes a first extinction pipe for filtering out stray light, the first extinction pipe connects the first color measurement device and the first detection aperture, and an inner wall of the first extinction pipe is provided with a stray light elimination structure.
In one embodiment of the present application, the parasitic light-eliminating structure includes a toothed stripe disposed around an inner wall of the first light-eliminating tube; the stray light eliminating structure comprises a dentate bulge arranged on the inner wall of the first extinction pipe.
In an embodiment of this application, the color meter is still including being used for measuring the second colour measuring equipment of diffuse reflection diaphragm's reflected light intensity, the aperture is surveyed to the second has still been seted up to the integrating sphere, second colour measuring equipment is just right the aperture setting is surveyed to the second, first survey aperture the sampling aperture with it dodges to go into the light aperture second colour measuring equipment sees through the aperture is surveyed to the second can directly observe the regional setting of integrating sphere inner wall.
Another object of the present application is a color measurement method suitable for use in a colorimeter as described above for measuring reflectance values of a sample, comprising:
acquiring calibration parameters: the 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 membrane obtained by the second color measuring device when the standard sample is measured;
obtaining light intensity: the color measuring instrument receives the reflected light intensity of the diffuse reflection membrane 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 color measuring instrument solves the light source attenuation rate of the continuous spectrum light source according to the reflected light intensity of the diffuse reflection membrane 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 color measuring instrument measures a standard white board, receives the reflected light intensity of the standard white board obtained by the first color measuring device and the reflected light intensity of the diffuse reflection membrane obtained by the second color measuring device when the standard white board is measured;
the color measuring instrument measures a standard blackboard, receives the reflected light intensity of the standard blackboard acquired by the first color measuring device, and receives the reflected light intensity of the diffuse reflection membrane acquired by the second color measuring device during measurement of the standard blackboard.
The implementation of a color meter of this application has following beneficial effect at least:
the inner side wall of the integrating sphere is covered by a diffuse reflection membrane, after light emitted by a continuous spectrum light source irradiates the diffuse reflection membrane, illumination of the inner space of the whole integrating sphere is realized through diffuse reflection, the surface of a sample is further illuminated, and the light intensity of the diffuse reflection light on the surface of the sample is detected by a first color measuring device, so that specific parameters of the surface color of the sample can be obtained; the diffuse reflection diaphragm is used for performing diffuse reflection on light rays emitted by the continuous spectrum light source and realizing illumination on the surface of a sample, so that the complicated spraying step of a diffuse reflection coating can be avoided in the production and manufacturing process, the manufacturing process of the integrating sphere is simplified, and the manufacturing cost of the color measuring instrument is reduced; and the shape of diffuse reflection diaphragm is corresponding to the shape of spherical segment integrating sphere, and the position that sampling aperture and first detection aperture correspond is provided with the breach, compare in the diffuse reflection layer of spraying formula, the scheme of adopting diffuse reflection diaphragm can not leave diffuse reflection material on the lateral wall in sampling aperture and first detection aperture, and then avoid light direct irradiation to first colour measurement equipment after the lateral wall reflection in first detection aperture, has also improved the homogeneity of shining to the light intensity angular distribution on measured sample surface, has finally improved the reproducibility of colorimeter.
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 a colorimeter according to one embodiment of the present application;
FIG. 2 is a schematic cross-sectional view of the colorimeter shown in FIG. 1;
FIG. 3 is a cross-sectional view of the colorimeter shown in FIG. 2 along direction A;
FIG. 4 is a schematic diagram of the principle of operation of the colorimeter shown in FIG. 1;
fig. 5 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-integrating sphere; 110-diffuse reflection membrane; 111-sampling aperture; 112 — a first detection aperture; 113-an entrance aperture; 114 — a second detection aperture; 12-a continuum light source; 131-a first color measurement device; 132-a second color measurement device; 14-a coupling lens; 15-light-homogenizing glass; 16-an imaging diaphragm; 161-a first diaphragm; 162-a second diaphragm; 170-stray light eliminating structure; 171-a first extinction tube; 172-second extinction tube; 21 sample (c); 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. 1, 2 and 4, the present embodiment provides a color meter, which includes an integrating sphere 11, a continuum light source 12, a first color measurement device 131 and a diffuse reflection film 110; the integrating sphere 11 is provided with a sampling aperture 111 for aligning the sample 2 and a first detection aperture 112 for allowing the diffuse reflection light of the sample 2 to pass through; the continuous spectrum light source 12 is arranged opposite to the inner space of the integrating sphere 11 and used for projecting continuous spectrum light into the integrating sphere 11; the first color measuring device 131 is disposed opposite to the first detecting aperture 112, 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 membrane 110 is attached to the inner wall of the integrating sphere 11, and notches are formed in positions of the diffuse reflection membrane 110 corresponding to the sampling aperture 111 and the first detection aperture 112.
Specifically, the colorimeter provided in this embodiment operates as follows:
referring to fig. 3, a sampling aperture 111 is aligned with a sample 2, a continuum light source 12 projects continuum light into an integrating sphere 11, and the continuum light illuminates the inner space of the integrating sphere 11 under the diffuse reflection action of a diffuse reflection membrane 110 attached to the inner wall of the integrating sphere 11, so as to illuminate the surface of the sample 2; while the light illuminates the surface of the sample 2, diffuse reflection occurs again on the surface of the sample 2, part of the diffuse reflection light passes through the first detection aperture 112 and is received by the first color measurement device 131 which is arranged right opposite to the first detection aperture 112, and the first color measurement device 131 obtains specific parameters of the surface color of the sample 2 through analysis according to the light intensity of the received diffuse reflection light.
The implementation of the color measuring instrument provided by the embodiment can at least achieve the following beneficial effects:
the inner side wall of the integrating sphere 11 is covered by the diffuse reflection film 110, and after the light emitted by the continuous spectrum light source 12 irradiates the diffuse reflection film 110, the light of the whole inner space of the integrating sphere 11 is realized through diffuse reflection, so that the surface of the sample 2 is illuminated, the light intensity of the diffuse reflection light on the surface of the sample 2 is detected by the first color measuring device 131, and specific parameters of the surface color of the sample 2 can be obtained; the diffuse reflection film 110 is used for performing diffuse reflection on the light emitted by the continuous spectrum light source 12 and realizing illumination on the surface of the sample 2, so that the complicated spraying step of a diffuse reflection coating can be avoided in the production and manufacturing process, the manufacturing process of the integrating sphere 11 is simplified, and the manufacturing cost of the color measuring instrument is reduced; moreover, the shape of the diffuse reflection membrane 110 corresponds to the shape of the segment-shaped integrating sphere 11, and a notch is formed at a position corresponding to the sampling aperture 111 and the first detection aperture 112, compared with a spray-coated diffuse reflection layer, the scheme of using the diffuse reflection membrane 110 does not leave a diffuse reflection material on the side walls of the sampling aperture 111 and the first detection aperture 112, so that light is prevented from being reflected by the side wall of the first detection aperture 112 and then directly irradiating the first color measurement device 131, the uniformity of the distribution of the light intensity and the angle of the light irradiated to the surface of the sample 2 to be measured is also improved, and finally, the reproducibility of the color measuring instrument and the accuracy of the measurement result are improved.
It should be noted that, in the related art of color photometers, reproducibility refers to consistency of measurement results of the first color measurement device 131 when the sample 2 is aligned with the sampling aperture 111 at all times while being aligned with the first color measurement device 131 in different postures during rotation around the center normal of the sampling aperture 111. A direct factor affecting reproducibility is that the reproducibility of the condensed spot of the signal light irradiated to the first color measurement device 131 is poor. Reproducibility is an important performance evaluation index of a color photometer, and when interference light signals exist due to the influence of a structure of the color photometer on signal light, or when the surface of a measured object is not uniform and the distribution of light intensity angles of light rays received by a sample 2 is not uniform, and the sample 2 rotates around the central normal of a sampling aperture 111, light intensity measurement results of first color measurement equipment 131 corresponding to different angles are different, so that the measurement results have large errors and poor reproducibility.
As a specific aspect of this embodiment, the diffuse reflection film 110 is prepared by a thermoforming process. In this embodiment, the diffusion reflection coating sprayed on the inner wall of the integrating sphere 11 in the traditional scheme is replaced by the thermoformed diffusion reflection film 110, the process is simplified, the manufacturing cost of the color photometer is reduced, and meanwhile, no diffusion reflection material is left on the side walls of the sampling aperture 111 and the first detection aperture 112, so that the light is prevented from directly irradiating the first color measurement device 131 after being reflected by the side wall of the first detection aperture 112, the uniformity of the light intensity angle distribution irradiating the surface of the sample 2 to be measured and the reproducibility of the converged light spots are also improved, and finally, the reproducibility of the color photometer and the accuracy of the measurement result are improved.
As a preferable scheme of this embodiment, the diffuse reflection film 110 is an Ultraviolet (UV) resistant film, that is, the diffuse reflection film 110 is provided with an ultraviolet-proof layer, so that ultraviolet rays in the continuous spectrum light source 12 can be prevented from irradiating the sample 2, and the sample 2 emits fluorescence under excitation of the ultraviolet rays, which affects accuracy of the detection result.
Referring to fig. 2 to 4, in an embodiment of the present application, the integrating sphere 11 further has a light entrance aperture 113 for defining a light spot range that the continuum light source 12 can directly irradiate in the integrating sphere 11, the continuum light source 12 is disposed opposite to the light entrance aperture 113, and the first detecting aperture 112 and the sampling aperture are disposed away from the region where the continuum light source 12 directly irradiates on the inner wall of the integrating sphere 11 through the light entrance aperture 113. The light entrance aperture 113 is arranged to limit the continuous spectrum light spot boundary directly projected by the continuous spectrum light source 12 on the inner wall of the integrating sphere 11, and prevent the continuous spectrum light from directly projecting on the sample 2, so as to reduce or even avoid the mirror reflection effect of the surface of the sample 2 and the fluorescence effect of the surface of the sample 2 under the irradiation of ultraviolet rays, and avoid the uneven angular distribution when light enters the surface of the sample 2, and finally improve the accuracy and reproducibility of the measurement result; the continuum light is also prevented from impinging directly on the side walls of the detection aperture and this portion of the light is prevented from interfering with the light signal received by the first color measurement device 131. It can be understood that, because the colorimeter in this embodiment adopts the scheme of disposing the diffuse reflection film 110 in the integrating sphere 11, compared with the conventional scheme of spraying the diffuse reflection coating on the inner wall of the integrating sphere 11, the colorimeter can also achieve the effect of not leaving the diffuse reflection material on the side wall of the light entrance aperture 113, and further can prevent light from influencing the colorimetry result of the first color measuring device 131 after being reflected by the side wall of the light entrance aperture 113.
Referring to fig. 2, as a specific solution of the present embodiment, the integrating sphere 11 includes an upper hemisphere and a lower hemisphere, and the sampling aperture 111 is disposed at the bottom of the lower hemisphere; the first detection aperture 112 is disposed at a position close to the top of the upper hemisphere, the optical axis of the first color measurement device is disposed along a connection line between the center point of the sampling aperture 111 and the center point of the first detection aperture 112, and the connection line and the center normal of the sampling aperture 111 form an angle of 8 °; the light entrance aperture 113 is disposed at the boundary of the upper hemisphere and the lower hemisphere, and preferably, the light entrance aperture 113 is disposed at the boundary of the upper hemisphere and the lower hemisphere where the central normal of the sampling aperture 111 is biased to one side of the first detection aperture 112. The design can simplify the structure of the color measuring instrument, optimize the production and manufacturing process and reduce the cost.
Referring to fig. 2-4, in one embodiment of the present application, the colorimeter further includes a coupling lens 14 for imaging the sample 2 for measurement by the first color measurement device 131, the coupling lens 14 being disposed between the first color measurement device 131 and the first detection aperture 112. The coupling lens 14 is used for coupling the diffusely reflected light emitted from the sample 2 and can filter the light projected to the first color measurement device 131 from other directions to some extent, so as to improve the signal-to-noise ratio of the optical signal of the sample 2.
Referring to fig. 2 and fig. 3, as a specific solution of this embodiment, the optical axis of the coupling lens 14 coincides with a connecting line between the central point of the sampling aperture 111 and the central point of the first detection aperture 112, and the sample 2 is imaged at the light equalizing glass 15 for the color measurement of the first color measurement device 131.
Referring to fig. 2 and 3, in an embodiment of the present application, the color meter further includes a light equalizing glass 15, the light equalizing glass 15 is disposed at a position where the coupling lens 14 images the sample 2, and the first color measurement device 131 is disposed opposite to the light equalizing glass 15, so that uniformity of color and light intensity of light spots imaged by the coupling lens 14 can be improved, stability of optical signals received by the first color measurement device 131 is further improved, and influence of different illuminance at different positions on measurement reproducibility of the color meter on the sample 2 is eliminated.
Referring to fig. 2 and 3, in an embodiment of the present application, the colorimeter further includes at least one imaging diaphragm 16, and the imaging diaphragm 16 is disposed between the first color measuring device 131 and the first detecting aperture 112, and is capable of further filtering stray light and preventing light outside the surface of the sample 2 from being received by the first color measuring device 131.
Referring to fig. 2 and fig. 3, as a specific scheme of the present embodiment, the imaging diaphragm 16 includes a first diaphragm 161 and a second diaphragm 162, the second diaphragm 162 is attached to a surface of the light-equalizing glass 15, which faces the coupling lens 14, and is used for defining the size of a light spot imaged on the light-equalizing glass 15, and the area of a detection region of the first color measurement device 131 is smaller than the area of the light spot on the light-equalizing glass 15, so that it can be ensured that the first color measurement device 131 only receives diffuse reflection light from the sample 2; the first diaphragm 161 is disposed between the light equalizing glass 15 and the coupling lens 14, and is used to eliminate stray light, prevent light rays at other positions than the sample 2 from interfering with the optical signal received by the first color measurement device 131, and improve measurement reproducibility of the color photometer.
In one embodiment of the present application, the first color measurement device 131, the light equalizing glass 15, the second diaphragm 162, the first diaphragm 161, and the coupling lens 14 are coaxially disposed, and are sequentially disposed from far to near along a connection line between the central points of the sampling aperture 111 and the first detection aperture 112; the coupling lens 14 images the sample at the sampling aperture 111 to the position of the light equalizing glass 15, the second diaphragm 162 is attached to the light equalizing glass 15, so as to limit the field range of the first color measurement device 131, and the size of the diaphragm aperture is smaller than the size of the image of the sampling aperture 111 presented by the coupling lens 14, so that the field range that can be observed by the first color measurement device 131 through the second diaphragm 162 falls in the sampling aperture 111. By setting the size of the aperture of the second diaphragm 162 to be smaller than the size of the image of the sampling aperture 111 presented by the coupling lens 14 on the light equalizing glass 15, the detection area of the first color measurement device 131 for the sample 2 can be made smaller than the sampling aperture 111, ensuring that the optical signal of the first color measurement device 131 is not interfered by the light reflected by the diffuse reflection membrane 110.
Referring to fig. 1 to 3, in an embodiment of the present application, the color meter further includes a first extinction tube 171 for filtering out stray light, the first extinction tube 171 is connected to the first color measurement device 131 and the first detection aperture 112, and a stray light eliminating structure 170 is disposed on an inner wall of the first extinction tube 171; the parasitic light eliminating structure 170 includes a toothed stripe disposed around the inner wall of the first light eliminating tube 171; the stray light eliminating structure 170 includes a tooth-shaped protrusion disposed on an inner wall of the first light eliminating tube 171. The first extinction tube 171 is arranged to filter out stray light outside the field of view of the first color measurement device 131, and reduce the influence of stray light signals on measurement results, thereby reducing measurement errors and improving repeatability of the measurement results.
As a preferable scheme of this embodiment, the color erasing paint is coated on the tooth-shaped stripe or the tooth-shaped protrusion, so that stray light can be further filtered, the influence of an optical signal outside the field of view of the first color measurement device 131 on the measurement result is reduced, and further, the measurement error is reduced and the measurement reproducibility is improved.
Referring to fig. 1 to 4, in an embodiment of the present application, the color meter further includes a second color measuring device 132 for measuring the light intensity of the reflected light of the diffuse reflection diaphragm 110, the integrating sphere 11 is further provided with a second detecting aperture 114, the second color measuring device 132 is disposed opposite to the second detecting aperture 114, and the first detecting aperture 112, the sampling aperture and the light entrance aperture 113 are disposed away from an area of the inner wall of the integrating sphere 11 that can be directly observed by the second color measuring device 132 through the second detecting aperture 114. The second color measurement device 132 is used for receiving and measuring the diffuse reflection light of the diffuse reflection film 110, further obtaining the intensity of the light inside the integrating sphere 11 and monitoring the change of the light in real time, and correcting the measurement result of the first color measurement device 131, thereby eliminating the influence of the change of the light intensity emitted by the continuous spectrum light source 12 on the measurement result of the first color measurement device 131 and the influence of the color of the sample 2 on the measurement result of the first color measurement device 131, and the colorimeter does not need to be debugged and calibrated repeatedly in the using process.
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 color meter, and no separate light path needs to be disposed for the second color measurement device 132, so as to simplify the structure of the 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 light intensity variation 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 disposed around the second color measurement device 132 and the entrance aperture 113 is disposed around the second detection aperture 114; or, the continuum light sources 12 are uniformly arranged around the second color measurement device 132, and the light entrance aperture 113 is uniformly arranged around the second detection aperture 114, 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. 2 and fig. 4, as a specific solution of the present embodiment, the color meter further includes a second light-eliminating tube 172 for filtering stray light, the second light-eliminating tube 172 is connected to the second detection aperture 114 and the second color measurement device 132, and a stray light-eliminating structure 170 is disposed on an inner wall of the second light-eliminating tube 172; the parasitic light eliminating structure 170 includes a toothed stripe disposed around the inner wall of the first light eliminating tube 171; the stray light eliminating structure 170 includes a tooth-shaped protrusion disposed on an inner wall of the first light eliminating tube 171. The second light-eliminating tube 172 is arranged to filter out stray light outside the field of view of the second color measurement device 132, so as to reduce the influence of stray light signals on measurement results, thereby reducing measurement errors and improving measurement reproducibility.
Referring to fig. 1 and 2, in an embodiment of the present disclosure, the colorimeter 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 colorimeter, 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 closes the continuous spectrum light source 12 after collection is completed, so as 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 colorimeter, so as to calibrate the colorimeter at any time, so as to avoid errors caused by aging of optical devices, rapid changes of ambient temperature, so as to further improve accuracy, the base is on a main case, namely, the base is connected to a mobile phone, i.e, the wireless connection module may be connected to the bluetooth E19, and may be connected to the wireless connection module △, and may be connected to the bluetooth E module 3, and may be connected to the bluetooth E, and may be connected to the bluetooth module △, and may be connected to measure various kinds of the bluetooth E.
Another object of the present application is a color measurement method suitable for use in a colorimeter as described above for measuring reflectance values of a sample 2 comprising:
acquiring calibration parameters: the 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 film 110 obtained by the second color measuring device 132 when the standard sample is measured;
obtaining light intensity: the colorimeter receives the reflected light intensity of the diffuse reflection film 110 obtained by the second color measurement device 132 and the reflected light intensity of the sample 2 obtained by the first color measurement device 131;
solving for sample 2 reflectivity: the colorimeter solves the light source attenuation rate of the continuum light source 12 according to the reflected light intensity of the diffuse reflection film 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 integrating sphere 11 is complex after the sample 2 is placed, and the spectrum of the light emitted by the continuous spectrum light source 12 changes with time as the conditions such as temperature change, 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. Therefore, the second color measurement device 132 is introduced, and the measurement result of the first color measurement device 131 is corrected by monitoring the intensity change of the continuous spectrum light in the integrating sphere 11 in each frequency band in real time; and the calibration parameters are obtained by measuring the standard sample, and the measurement values obtained by the first color measurement device 131 are compensated, so that the error of the measurement result of the colorimeter on 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 color meter 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 film 110 obtained by the second color measuring device 132 when measuring the standard white board;
the 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 film 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 obtained by the first color measuring device 131, the reflected light intensity of the diffuse reflection diaphragm 110 obtained by the second color measuring device 132 when measuring the standard white board, the reflected light intensity of the standard blackboard obtained by the first color measuring device 131, and the reflected light intensity of the diffuse reflection diaphragm 110 obtained by the second color measuring device 132 when measuring the standard blackboard.
As a specific aspect of this embodiment, the color meter corrects the light source attenuation rate. When the continuous spectrum light irradiates the sampling aperture 111 through the diffuse reflection membrane 110, part of the light irradiates the diffuse reflection membrane 110 after being diffused by the sample 2, and irradiates the second color measurement device 132 after being diffused by the diffuse reflection membrane 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 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. 5, in the present embodiment, the color measurement method includes:
s1: acquiring calibration parameters: the color meter measures the standard white board and receives the reflected light intensity I of the standard white board acquired by the first color measurement device 13111And the reflected light intensity I of the diffuse reflection film 110 acquired 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 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 diaphragm 110 acquired by the second color measurement device 132 when measuring a standard blackboard22Reflectance of standard blackboard is R2；
S2: obtaining light intensity: the 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., the uncorrected color detection result of the sample 2), and the intensity I of the reflected light of the diffuse reflection film 110 obtained by the second color measurement device 132 at the time of measuring the sample 22；
S3: solving for sample 2 reflectivity: the colorimeter solves the light source attenuation rate of the continuum light source 12 according to the reflected light intensity of the diffuse reflection film 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 color measuring instrument corrects the light source attenuation rate A, and specifically comprises the following steps:
where h is the coefficient of influence, R0For the uncorrected color detection result of sample 2, specifically:
the final reflectance values for sample 2 were:
since the optical environment inside the integrating sphere 11 is complicated after the sample 2 is placed, the result of color measurement by the first color measurement device 131 is affected. 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 continuous spectrum light irradiates the sampling aperture 111 through the diffuse reflection membrane 110, a part of the continuous spectrum light irradiates the diffuse reflection membrane 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 membrane 110, so that a detection result of the first color measurement device 131 has a certain error. 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 colorimeter on the measurement result of 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 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. A colorimeter, comprising:
the integrating sphere is provided with a sampling aperture for aligning a sample and a first detection aperture for allowing diffuse reflection light of the sample to pass through;
the continuous spectrum light source is arranged right opposite to the inner space of the integrating sphere and used for projecting continuous spectrum light into the integrating sphere;
the first color measuring device is arranged right opposite to the first detection aperture 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 the diffuse reflection membrane is attached to the inner wall of the integrating sphere, and a notch is arranged at the position corresponding to the sampling aperture and the first detection aperture.
2. The colorimeter according to claim 1, wherein the integrating sphere is further provided with a light entrance aperture for defining a light spot range which can be directly irradiated by the continuum light source in the integrating sphere, the continuum light source is arranged opposite to the light entrance aperture, and the first detection aperture and the sampling aperture are arranged to avoid a region which is directly irradiated by the continuum light source on the inner wall of the integrating sphere through the light entrance aperture.
3. The colorimeter of claim 1 further comprising a coupling lens for imaging the sample for measurement by the first color measurement device, the coupling lens being disposed between the first color measurement device and the first detection aperture.
4. The colorimeter of claim 3 further comprising a light equalizing glass disposed at a location where the coupling lens images the sample, and the first color measurement device is disposed directly opposite the light equalizing glass.
5. The colorimeter of claim 1 further comprising at least one imaging aperture disposed between the first color measurement device and the first detection aperture.
6. The colorimeter of claim 1 further comprising a first extinction tube for filtering stray light, the first extinction tube connecting the first color measuring device and the first detection aperture, and an inner wall of the first extinction tube being provided with stray light eliminating structures.
7. The colorimeter according to claim 6, wherein the stray light reducing structures comprise toothed striations disposed around an inner wall of the first light reducing tube; the stray light eliminating structure comprises a dentate bulge arranged on the inner wall of the first extinction pipe.
8. The colorimeter according to any one of claims 1 to 7 further comprising a second color measuring device for measuring the intensity of reflected light from the diffuse reflective membrane, the integrating sphere further defining a second detection aperture, the second color measuring device being disposed opposite the second detection aperture, the first detection aperture, the sampling aperture and the light entrance aperture being disposed away from a region of the inner wall of the integrating sphere through which the second color measuring device can directly observe.
9. A color measuring method for measuring a reflectance value of a sample, which is applied to the colorimeter according to claim 8, comprising:
acquiring calibration parameters: the 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 membrane obtained by the second color measuring device when the standard sample is measured;
obtaining light intensity: the color measuring instrument receives the reflected light intensity of the diffuse reflection membrane 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 color measuring instrument solves the light source attenuation rate of the continuous spectrum light source according to the reflected light intensity of the diffuse reflection membrane 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 color measuring instrument measures a standard white board, receives the reflected light intensity of the standard white board obtained by the first color measuring device and the reflected light intensity of the diffuse reflection membrane obtained by the second color measuring device when the standard white board is measured;
the color measuring instrument measures a standard blackboard, receives the reflected light intensity of the standard blackboard acquired by the first color measuring device, and receives the reflected light intensity of the diffuse reflection membrane acquired by the second color measuring device during measurement of the standard blackboard.
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| CN202010017776.XA CN111141387A (en) | 2020-01-08 | 2020-01-08 | Color measuring instrument and color measuring method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220196477A1 (en) * | 2020-06-19 | 2022-06-23 | China Jiliang University | Colorimeter and reflectivity measuring method based on multichannel spectrum |
| CN115307736A (en) * | 2022-07-18 | 2022-11-08 | 苏州普立视科技有限公司 | Light splitting colorimeter light collecting system |
| CN116068316A (en) * | 2023-02-03 | 2023-05-05 | 济南大学 | Application of chromatic aberration technology in detecting state of energy storage device |
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2020
- 2020-01-08 CN CN202010017776.XA patent/CN111141387A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220196477A1 (en) * | 2020-06-19 | 2022-06-23 | China Jiliang University | Colorimeter and reflectivity measuring method based on multichannel spectrum |
| US12098957B2 (en) * | 2020-06-19 | 2024-09-24 | Caipu Technology (Zhejiang) Co., Ltd. | Colorimeter and reflectivity measuring method based on multichannel spectrum |
| CN115307736A (en) * | 2022-07-18 | 2022-11-08 | 苏州普立视科技有限公司 | Light splitting colorimeter light collecting system |
| CN115307736B (en) * | 2022-07-18 | 2023-09-29 | 苏州普立视科技有限公司 | Light collecting system of spectrocolorimeter |
| CN116068316A (en) * | 2023-02-03 | 2023-05-05 | 济南大学 | Application of chromatic aberration technology in detecting state of energy storage device |
| CN116068316B (en) * | 2023-02-03 | 2023-09-29 | 济南大学 | Application of chromatic aberration technology in detecting state of energy storage device |
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