CN108195469B - Portable color measuring instrument - Google Patents
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- CN108195469B CN108195469B CN201810116882.6A CN201810116882A CN108195469B CN 108195469 B CN108195469 B CN 108195469B CN 201810116882 A CN201810116882 A CN 201810116882A CN 108195469 B CN108195469 B CN 108195469B
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- 238000000265 homogenisation Methods 0.000 description 10
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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
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- General Physics & Mathematics (AREA)
- Spectrometry And Color Measurement (AREA)
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Abstract
The invention discloses a portable color measuring instrument, and belongs to color measuring equipment in the field of optical measurement. The portable color measuring instrument is cuboid in appearance, the top of the portable color measuring instrument is provided with a handle, a measuring button and a touch screen display, and the bottom of the portable color measuring instrument is provided with a measuring window and a measuring bottom cover. The portable color measuring instrument consists of a light source, an integrating sphere, a condenser, a monochromator, an array CCD sensor, an analog-to-digital converter, a microprocessor, a memory, a power supply and the like. After the measurement light is collected and homogenized by an integrating sphere, the light is split and measured by a high-resolution monochromator and an array CCD sensor, and color parameters are calculated by a microprocessor according to standards such as ISO. The excellent design ensures that the portable color measuring instrument has the advantages of high measuring precision, good repeatability, high measuring efficiency, convenient carrying and simple operation, and can be widely applied to the color measurement of raw materials and products on the production line site in the fields of cloth, paper, dye, paint, beverage, plastics and the like.
Description
Technical Field
The invention belongs to color measuring equipment in the field of optical measuring instruments, and particularly relates to a portable color measuring instrument.
Background
The articles that people can see have certain colors, so the colors are an important sensory experience for human beings. In daily life, people can qualitatively describe the color of an object observed by simple red, orange, yellow, green, blue, indigo, and purple. In some specific production fields, however, quantitative description of the color of the measured material is required by specific parameters.
The ordinary spectrophotometer has powerful functions in the aspect of optical measurement, and can measure parameters such as the transmittance, the reflectivity, the absorptivity and the solution concentration of materials. It is of course also possible to measure the color of different materials accurately and to quantitatively describe the color of the measured material in a specific color space by specific parameters. However, the common spectrophotometer is troublesome to use on the production line site, and is mainly characterized in that: the general spectrophotometer is large in size, inconvenient to carry, high in requirements on use environment and required to be planned with a special space for placement and operation; secondly, the operation method of the ordinary spectrophotometer is complex, and the operation can be carried out only by a person who is trained professionally; thirdly, the common spectrophotometer generally adopts a wavelength scanning measurement mode, the measurement time of a single sample is long, and the measurement efficiency is low.
For some specific production fields, such as production fields of cloth, paper, dye, paint, beverage, plastics and the like, the color of raw materials and products at different positions of a production line needs to be measured and recorded timely and quickly on site, so that the used color measuring instrument is required to have the advantages of high measuring efficiency, convenience in carrying, simplicity in operation and the like.
Disclosure of Invention
Aiming at the timely and rapid measurement requirements of the colors of raw materials and products on production line sites in the fields of cloth, paper, dye, coating, beverage, plastics and the like, the invention provides a portable color measurement instrument which has the advantages of high measurement precision, good repeatability, high measurement efficiency, small size, portability, convenient carrying and simple operation.
The portable color measuring instrument is cuboid in appearance, the length of the cuboid is 18-25 cm, and the width and height of the cuboid are consistent to 8-12 cm. The top of the portable color measuring instrument is provided with a handle which is convenient to carry and operate, and one end of the handle is provided with a measuring button for controlling the measurement of the portable color measuring instrument. The top of the portable color measuring instrument is provided with a touch screen display used for selecting and displaying measured data. The bottom of the portable color measuring instrument is provided with a circular measuring window, the aperture of the circular measuring window is 0.5-1.0 cm, and an optical trap or a standard white board or a measured sample is arranged at the measuring window and is close to the measuring window during measurement. The side surface of the portable color measuring instrument is provided with a USB interface for charging an instrument power supply and transmitting data, and is provided with a power switch for starting or closing the instrument. And small dents are designed around the bottom surface of the portable color measuring instrument.
The portable color measuring instrument is provided with a measuring bottom cover, the measuring bottom cover is in a cuboid water tank shape, the length and width of the whole measuring bottom cover are consistent with those of the portable color measuring instrument, and the height of the measuring bottom cover is 1-2 cm. The thickness of the side wall of the measuring bottom cover is 0.1-0.2 cm, the side wall is matched with the small concave marks on the periphery of the bottom surface of the portable color measuring instrument, and the bottom of the portable color measuring instrument is just covered during measurement, so that the influence of ambient light on a measurement result is eliminated. A circular lofting groove is formed in the position, matched with a measuring window of the portable color measuring instrument, in the measuring bottom cover and used for placing an optical trap or a standard white board or a measured sample. The portable color measuring instrument is provided with a sample vessel, and the size of the sample vessel is matched with the size of the sample groove in the measuring bottom cover. The sample vessel can be used for placing a solid sample, a liquid sample, a powder sample and a particle sample, and the integrating sphere is used for collecting the reflected light of the sample (including the reflected light in all directions reflected by the sample), so that the portable color measuring instrument can be used for measuring the color of the material samples in various forms such as solid, liquid, powder and particles, and has a very wide application field.
The portable color measuring instrument comprises an optical measuring unit, a microprocessor, a memory, a touch screen display, a USB interface, a power supply, a cable, a shell and the like.
The optical measurement unit consists of a light source, an integrating sphere, a condenser, a monochromator, an array CCD sensor and an analog-to-digital converter. The light source is a flash light source, the effective wavelength range of the spectrum is 360-800 nm, and the flash intensity and the flash time of the light source are controlled by the chip, so that the luminous flux of each flash is very high, the consistency of the luminous flux of each flash is ensured, and the signal-to-noise ratio of the instrument can be effectively improved. The radius size of the integrating sphere is 2.5-5 cm, a white diffuse reflection coating with high reflectivity is coated inside the integrating sphere, the integrating sphere can play a good homogenization role on measuring light, and all reflected light reflected by a sample (no matter whether the sample is specular reflection or diffuse reflection) is collected. The collecting lens mainly performs a converging function on the measuring light so as to better enter the monochromator. The monochromator adopts a fixed wavelength structure and has the function of light splitting, namely, measuring light entering the entrance slit is split into monochromatic light and is emitted from the corresponding exit slit. The array CCD sensor is tightly attached to the exit slits of the monochromator and used for measuring the light intensity of the corresponding wavelength of each exit slit. The analog-to-digital converter is used for converting analog signals measured by the array CCD sensor into digital signals and then transmitting the digital signals to the microprocessor for data processing.
The microprocessor is used for processing and calculating the original data acquired by the optical measurement unit, calculating the color parameters of the measured sample, and communicating with the components such as the memory, the touch screen display, the USB interface and the like.
The touch screen display is used for displaying current measurement data and can select to view historical measurement data.
The memory is used for storing measurement data and internal algorithms.
The power supply is a rechargeable lithium ion battery and is used for supplying power to components such as an optical measurement unit, a microprocessor and the like.
The working principle of the portable color measuring instrument is as follows: when in measurement, a measurement button is touched, light emitted by a light source is subjected to multiple diffuse reflection homogenization in an integrating sphere, meanwhile, reflected light of a measured sample is collected and homogenized by the integrating sphere, the measurement light is emitted from a light-transmitting window at the side part of the integrating sphere to a condenser, the condensed light enters a monochromator from an incident slit, and the measurement light is decomposed into monochromatic light by optical elements such as a grating in the monochromator and is emitted from a corresponding emergent slit; and then the light intensity of the corresponding wavelength is measured by the array CCD sensor, and an analog signal measured by the array CCD sensor is converted into a digital signal by the analog-to-digital converter and is transmitted to the microprocessor for data processing. And the microprocessor calculates the reflectivity spectrum of the tested sample by combining the data of the zero calibration and the standard white board calibration. And further calculating the color parameters of the detected sample in different color spaces according to the reflectivity spectrum of the detected sample. The color parameters obtained by measurement are displayed by the touch screen display, and are stored by the memory for later calling. The internal algorithm of the portable color measuring instrument refers to the calculation methods of ISO, ASTM, GB/T and other standards, and the method for converting the original measurement data into the color parameters is accurate and reliable.
The measurement flow of the portable color measuring instrument is as follows.
(1) And carrying out zero calibration.
And placing the light trap in the lofting groove of the measurement bottom cover, placing the portable color measurement instrument on the measurement bottom cover, matching the side wall of the measurement bottom cover with the small grooves around the bottom of the portable color measurement instrument, and just covering the bottom of the portable color measurement instrument, wherein the light trap is opposite to and close to the measurement window of the portable color measurement instrument. And when the measuring button is touched, light beams generated by the light source enter the integrating sphere, are subjected to multiple diffuse reflection homogenization in the integrating sphere, meanwhile, light irradiated on the light trap is absorbed by the light trap, the measuring light is emitted to the collecting mirror from a light-transmitting window at the side part of the integrating sphere, is converged to the monochromator incidence slit by the collecting mirror, is decomposed into monochromatic light with different wavelengths by the monochromator, is emitted from the corresponding exit slit, and then is measured by the array CCD sensor to obtain the light intensity with the corresponding wavelength. The analog signal measured by the array CCD sensor is converted into a digital signal by the analog-to-digital converter and transmitted to the microprocessor, and the digital signal is calculated and processed by the microprocessor and then is used as calibration data of a zero point to be stored in the memory for standby.
(2) And (5) calibrating the standard white board.
And placing the standard white board in the lofting groove of the measurement bottom cover, placing the portable color measurement instrument on the measurement bottom cover, matching the side wall of the measurement bottom cover with the small concave marks on the periphery of the bottom of the portable color measurement instrument, just covering the bottom of the portable color measurement instrument, and enabling the standard white board to be opposite to and close to the measurement window of the portable color measurement instrument. The measuring button is touched, light beams generated by the light source enter the integrating sphere, are subjected to multiple diffuse reflection homogenization in the integrating sphere, reflected light of the standard white board is collected and homogenized by the integrating sphere, the measuring light is emitted to the collecting mirror from a light-transmitting window at the side part of the integrating sphere, is converged to the monochromator incidence slit by the collecting mirror, is decomposed into monochromatic light with different wavelengths by the monochromator, is emitted from the corresponding exit slit, and is measured by the array CCD sensor to obtain light intensity with the corresponding wavelengths. The analog signal measured by the array CCD sensor is converted into a digital signal by the analog-to-digital converter and transmitted to the microprocessor, and the digital signal is calculated and processed by the microprocessor and then is stored in the memory as the calibration data of the standard white board for standby.
(3) Sample measurements were taken and color parameters were derived.
The measured sample is placed in the sample vessel, the sample vessel filled with the sample is placed in the lofting groove of the measurement bottom cover, the portable color measurement instrument is placed on the measurement bottom cover, the side wall of the measurement bottom cover is matched with the small grooves on the periphery of the bottom of the portable color measurement instrument, the bottom of the portable color measurement instrument is just covered, and the measured sample is opposite to and close to the measurement window of the portable color measurement instrument. The measuring button is touched, light beams generated by the light source enter the integrating sphere, are subjected to multiple diffuse reflection homogenization in the integrating sphere, reflected light of a measured sample is collected and homogenized by the integrating sphere, the measuring light is emitted to the collecting mirror from a light-transmitting window at the side part of the integrating sphere, is converged to the monochromator incidence slit by the collecting mirror, is decomposed into monochromatic light with different wavelengths by the monochromator, is emitted from the corresponding exit slit, and is measured by the array CCD sensor to obtain light intensity with the corresponding wavelength. And the analog signal measured by the array CCD sensor is converted into a digital signal by the analog-to-digital converter and transmitted to the microprocessor, and the microprocessor calculates the reflectivity spectrum of the measured sample by combining the data of zero calibration and standard white board calibration. And further calculating the color parameters of the detected sample in different color spaces according to the reflectivity spectrum of the detected sample. The color parameters obtained by measurement are displayed by the touch screen display, and are stored by the memory for later calling.
The portable color measuring instrument can adopt different color spaces to represent color parameters of a measured sample, and can select and switch among the different color spaces, wherein the adopted color spaces comprise CIE1931 XYZ color space, CIELAB color space and CIELUV color space.
The portable color measuring instrument can select a measuring sample as a reference sample in the process of measuring the sample, and can measure and calculate the chromaticity difference between the measured sample and the reference sample when measuring other samples.
Before the portable color measuring instrument is started to measure a sample, zero calibration and standard white board calibration are required. After each zero point calibration and standard white board calibration, the zero point calibration and standard white board calibration must be performed again after a certain number of sample measurements. To ensure the accuracy of the sample measurement, the number of times the sample measurement can be performed between the two zero point calibrations and the standard white board calibration cannot exceed 100 times.
Compared with the prior art, the portable color measuring instrument mainly has the following advantages and gain effects.
(1) The light source used in the optical measurement unit of the portable color measurement instrument is a flash light source, and the flash intensity and the flash time of the light source are controlled by the chip, so that the high luminous flux of each flash is ensured, the good consistency of the luminous flux of each flash is ensured, and the signal-to-noise ratio of the instrument is effectively improved; the integrating sphere can well collect homogenized measuring beams, and the high-resolution monochromator and the array CCD sensor have high measuring precision; the portable color measuring instrument has the advantages of high measuring precision, good repeatability and good stability due to excellent design and equipment.
(2) The portable color measuring instrument adopts the monochromator with a fixed wavelength structure and the array CCD sensor, realizes simultaneous measurement of multiple wavelengths, has short measurement time of a single sample and high measurement efficiency, and is very suitable for field test work of a production line.
(3) The internal algorithm of the portable color measuring instrument refers to the calculation methods of ISO, ASTM, GB/T and other standards, and the method for converting the original measurement data into the color parameters is accurate and reliable.
(4) The portable color measuring instrument has complete functions, can measure and calculate the color parameters of the sample in different color spaces, and automatically stores the measured data; a reference sample can be set, and the instrument can automatically calculate the chromaticity difference between the measured sample and the reference sample during measurement; the operation interface is friendly, the measurement parameters of the measured sample can be displayed in different color spaces through the touch screen display, and the historical measurement data can be called and viewed; the USB interface is equipped, and barrier-free communication with the outside can be realized.
(5) The portable color measuring instrument has the advantages of small volume, light weight and convenient carrying, and is very suitable for quickly measuring and recording the color parameters of raw materials and products on the production line site.
(6) The portable color measuring instrument is simple to operate and convenient to measure, and color measurement of production line samples can be carried out only by carrying out simple training instructions on operators.
(7) The portable color measuring instrument can measure material samples in various forms, including solid samples, liquid samples, powder samples and particle samples, and can be widely applied to color measurement of raw materials and products on production lines in the fields of cloth, paper, dye, coating, beverage, plastics and the like.
Drawings
FIG. 1 is a schematic top view of a portable color measurement instrument.
FIG. 2 is a schematic bottom view of the portable color measurement instrument.
FIG. 3 is a schematic side view of a portable color measuring instrument.
Fig. 4 is a schematic view of the internal structure of the portable color measuring instrument.
FIG. 5 is a schematic diagram of the working principle of the portable color measuring instrument.
The labels in the figure are: 101-handle, 102-measuring button, 103-touch screen display, 104-portable color measuring instrument bottom small dent, 201-measuring bottom cover, 202-measured sample, 203-measuring bottom cover side wall, 301-light source, 302-integrating sphere, 303-light through window, 304-measuring window, 305-condenser, 306-monochromator, 307-array CCD sensor, 308-analog-digital converter, 309-microprocessor, 310-power supply, 311-memory, 312-USB interface.
Detailed Description
In order to more clearly describe the contents of the present invention, the following detailed description will be given in conjunction with the accompanying drawings and examples. It should be understood that the following examples are intended to further illustrate the present invention and are not intended to limit the scope of the present invention.
In the present embodiment, the appearance of the portable color measuring instrument is a rectangular parallelepiped, as shown in fig. 1, 2, and 3. The portable color measuring instrument has a length of 20cm and a width and height dimension of 10 cm. A handle 101 is provided on the top of the portable color measuring instrument for carrying and operating, and a measuring button 102 is provided at one end of the handle for controlling the measurement of the portable color measuring instrument. On top of the portable color measuring device there is a touch screen display 103 for selecting and displaying measurement data. The bottom of the portable color measuring device has a circular measuring window 304 with an aperture of 0.5 cm. A USB interface 312 is provided on the side of the portable color measurement instrument for charging the instrument power supply and data transmission, and a power switch is provided for turning the instrument on or off. There are small recesses 104 around the bottom surface of the portable color measurement instrument.
The portable color measuring instrument of the present embodiment is equipped with a measuring bottom cover 201 as shown in fig. 3, 4. The measuring bottom cover is in a cuboid water tank shape, the length and width of the whole measuring bottom cover are respectively 20cm and 10cm consistent with the length and width of the portable color measuring instrument, and the height of the measuring bottom cover is 2 cm. The side wall 203 of the bottom cover is 0.2cm thick and matched with the small dent 104 around the bottom surface of the portable color measuring instrument, and the bottom of the portable color measuring instrument is just covered during measurement, so that the influence of ambient light on the measurement result is eliminated. A circular lofting groove is formed in the position, matched with a measuring window of the portable color measuring instrument, in the measuring bottom cover and used for placing an optical trap or a standard white board or a measured sample 202. The portable color measuring instrument is provided with a sample vessel, and the size of the sample vessel is matched with the size of the sample groove in the measuring bottom cover. The sample vessel can be used for placing a solid sample, a liquid sample, a powder sample and a particle sample, and the integrating sphere is used for collecting the reflected light of the sample (including the reflected light in all directions reflected by the sample), so that the portable color measuring instrument can be used for measuring the color of the material samples in various forms such as solid, liquid, powder and particles, and has a very wide application field.
The portable color measuring instrument of the present embodiment is composed of an optical measuring unit, a microprocessor 309, a memory 311, a touch screen display 103, a USB interface 312, a power supply 310, a cable, a housing, and the like, as shown in fig. 4.
The optical measurement unit of this embodiment is composed of a light source 301, an integrating sphere 302, a condenser 305, a monochromator 306, an array CCD sensor 307, and an analog-to-digital converter 308. The light source 301 is a flash light source, the effective wavelength range of the spectrum is 360-800 nm, the flash intensity and the flash time of the light source are controlled by the chip, so that the luminous flux of each flash is very high, the consistency of the luminous flux of each flash is ensured, and the signal-to-noise ratio of the instrument can be effectively improved. The integrating sphere 302 has a radius of 4cm and is internally coated with a high-reflectivity white diffuse-reflective coating, which provides good homogenization of the measurement light and collects all the reflected light from the sample (whether the sample is specular or diffuse). The condenser 305 primarily focuses the measurement light for better access to the monochromator. The monochromator 306 is a fixed wavelength structure and has a function of light splitting, i.e., the measurement light entering through the entrance slit is split into monochromatic light and emitted through the corresponding exit slit. The array CCD sensor 307 is closely attached to the exit slit of the monochromator 306 for measuring the light intensity of the wavelength corresponding to each exit slit. The analog-to-digital converter 308 is used for converting the analog signal measured by the array CCD sensor 307 into a digital signal and then transmitting the digital signal to the microprocessor 309 for data processing.
The microprocessor 309 of the present embodiment is used for processing and calculating raw data acquired by the optical measurement unit, calculating color parameters of the measured sample, and communicating with the memory 311, the touch screen display 103, the USB interface 312, and the like.
The touch screen display 103 of the present embodiment is used to display current measurement data and may select to view historical measurement data.
The memory 311 of the present embodiment is used for storing measurement data and internal algorithms.
The power supply 310 of this embodiment is a rechargeable lithium ion battery for powering components such as the optical measurement unit, microprocessor, etc.
The working principle of the portable color measuring instrument in the embodiment is shown in fig. 5: when in measurement, a measurement button is touched, light emitted by a light source 301 is subjected to multiple diffuse reflection homogenization in an integrating sphere 302, meanwhile, reflected light of a measured sample 202 is collected and homogenized by the integrating sphere, the measurement light is emitted from a light-transmitting window 303 at the side part of the integrating sphere to a condenser 305, the condenser 305 enters a monochromator 306 from an incident slit after being converged, and the measurement light is decomposed into monochromatic light by optical elements such as a grating in the monochromator 306 and is emitted from a corresponding emergent slit; the light intensity of the corresponding wavelength is measured by the array CCD sensor 307, and the analog signal measured by the array CCD sensor 307 is converted into a digital signal by the analog-to-digital converter 308, and transmitted to the microprocessor 309 for data processing. The microprocessor 309 calculates the reflectance spectrum of the sample to be measured by combining the data of the zero calibration and the standard white board calibration, and further calculates the color parameters of the sample to be measured in different color spaces according to the reflectance spectrum of the sample to be measured. The measured color parameters are displayed by the touch screen display 103 while being stored by the memory 311 for later recall. The internal algorithm of the portable color measuring instrument refers to the calculation methods of ISO, ASTM, GB/T and other standards, and the method for converting the original measurement data into the color parameters is accurate and reliable.
The measurement flow of the portable color measuring instrument of the present embodiment is as follows, with reference to fig. 4 and 5.
(1) And carrying out zero calibration.
The light trap is placed in the lofting groove of the measurement bottom cover 201, the portable color measurement instrument is placed on the measurement bottom cover 201, the side wall 203 of the measurement bottom cover 201 is matched with the small groove 104 around the bottom of the portable color measurement instrument and just covers the bottom of the portable color measurement instrument, and then the light trap is opposite to and closely attached to the measurement window 304 of the portable color measurement instrument. The measuring button 102 is touched, light beams generated by the light source 301 enter the integrating sphere 302, are subjected to multiple diffuse reflection homogenization in the integrating sphere 302, meanwhile, light irradiated on the light trap is absorbed by the light trap, the measuring light is emitted to the collecting mirror 305 through the light-transmitting window 303 at the side part of the integrating sphere 302, is converged to the entrance slit of the monochromator 306 through the collecting mirror 305, is decomposed into monochromatic light with different wavelengths through the monochromator 306, is emitted through the corresponding exit slit, and then is measured by the array CCD sensor 307 to obtain light intensity with the corresponding wavelength. The analog signal measured by the array CCD sensor 307 is converted into a digital signal by the analog-to-digital converter 308 and transmitted to the microprocessor 309, and the calibration data calculated and processed by the microprocessor 309 as a zero point is stored in the memory 311 for later use.
(2) And (5) calibrating the standard white board.
The standard white board is placed in the lofting groove of the measurement bottom cover 201, the portable color measurement instrument is placed on the measurement bottom cover 201, the side wall 203 of the measurement bottom cover 201 is matched with the small groove 104 around the bottom of the portable color measurement instrument and just covers the bottom of the portable color measurement instrument, and then the standard white board is opposite to and close to the measurement window 304 of the portable color measurement instrument. The measuring button 102 is touched, light beams generated by the light source enter the integrating sphere 302, are subjected to multiple diffuse reflection homogenization in the integrating sphere 302, meanwhile, reflected light of the standard white board is collected and homogenized by the integrating sphere, the measuring light is emitted to the collecting mirror 305 through the light-transmitting window 303 at the side part of the integrating sphere 302, is converged to the incident slit of the monochromator 306 by the collecting mirror 305, is decomposed into monochromatic light with different wavelengths by the monochromator 306, is emitted out through the corresponding emergent slit, and then is measured by the array CCD sensor 307 to obtain light intensity with the corresponding wavelength. The analog signal measured by the array CCD sensor 307 is converted into a digital signal by the analog-to-digital converter 308 and transmitted to the microprocessor 309, and the digital signal is calculated and processed by the microprocessor 309 and stored in the memory 311 as calibration data of the standard whiteboard for later use.
(3) Sample measurements were taken and color parameters were derived.
The sample to be measured is placed in the sample vessel, the sample vessel filled with the sample is placed in the lofting groove of the measurement bottom cover 201, the portable color measurement instrument is placed on the measurement bottom cover 201, the side wall 203 of the measurement bottom cover 201 is matched with the small concave marks 104 on the periphery of the bottom of the portable color measurement instrument, the bottom of the portable color measurement instrument is just covered, and the sample to be measured is opposite to and close to the measurement window 304 of the portable color measurement instrument. The measuring button 102 is touched, light beams generated by the light source enter the integrating sphere 302, are subjected to multiple diffuse reflection homogenization in the integrating sphere 302, reflected light of the measured sample 202 is collected and homogenized by the integrating sphere, the measuring light is emitted to the collecting mirror 305 through the light-transmitting window 303 at the side part of the integrating sphere 302, is converged to the incident slit of the monochromator 306 through the collecting mirror 305, is decomposed into monochromatic light with different wavelengths through the monochromator 306, is emitted through the corresponding emergent slit, and is measured by the array CCD sensor 307 to obtain light intensity with the corresponding wavelength. The analog signal measured by the array CCD sensor 307 is converted into a digital signal by the analog-to-digital converter 308 and transmitted to the microprocessor 309, and the microprocessor 309 calculates the reflectance spectrum of the sample 202 to be measured in accordance with the data of the zero calibration and the standard white board calibration. And further calculating the color parameters of the tested sample in CIE1931 XYZ color space, CIELAB color space and CIELUV color space according to the reflectivity spectrum of the tested sample. The measured color parameters are displayed by the touch screen display 103 while being stored by the memory 311 for later recall.
In this embodiment, the portable color measuring instrument needs to perform zero calibration and calibration of a standard white board before the portable color measuring instrument is turned on to perform sample measurement. After each zero point calibration and standard white board calibration, the zero point calibration and standard white board calibration must be performed again after a certain number of sample measurements. To ensure the accuracy of the sample measurement, the number of times the sample measurement can be performed between the two zero point calibrations and the standard white board calibration cannot exceed 100 times.
The portable color measuring instrument in the embodiment has the advantages of high measuring precision, good repeatability, high measuring efficiency, small size, light weight, convenience in carrying, simplicity in operation and the like.
Claims (6)
1. A portable color measuring instrument characterized by:
the portable color measuring instrument adopts a flash light source, the effective wavelength range of the flash light source is 360-800 nm, and the flash intensity and the flash time of the light source are controlled by a chip, so that the high luminous flux of each flash is ensured, the good consistency of the luminous flux of each flash is ensured, and the signal-to-noise ratio of the instrument is effectively improved; a condenser lens is designed in the measuring light path and is used for converging the measuring light so that the measuring light can better enter an incident slit of the monochromator with the fixed wavelength structure; the structural design of a monochromator with a fixed wavelength structure and an array CCD sensor tightly attached to an emergent slit of the monochromator is adopted; the monochromator with the fixed wavelength structure is used for decomposing the measuring light entering the entrance slit into monochromatic light at the same time and emitting the monochromatic light from the corresponding exit slit; the array CCD sensor is tightly attached to the exit slits of the monochromator and used for measuring the light intensity of the corresponding wavelength of each exit slit; the monochromator with the fixed wavelength structure and the array CCD sensor tightly attached to the emergent slit are structurally designed to realize simultaneous multi-wavelength measurement, the measurement time of a single sample is short, the measurement efficiency is high, and the method is very suitable for field test work of a production line;
the portable color measuring instrument is provided with a measuring bottom cover, the measuring bottom cover is used for placing the portable color measuring instrument when carrying out zero point calibration or standard white board calibration or sample measurement, and the bottom of the portable color measuring instrument is just covered when carrying out zero point calibration or standard white board calibration or sample measurement so as to eliminate the influence of ambient light on the measuring result; a circular lofting groove is formed in the position, matched with a measuring window of the portable color measuring instrument, in the measuring bottom cover and used for placing an optical trap or a standard white board or a sample vessel; the sample vessel can be used for placing a solid sample, a liquid sample, a powder sample or a particle sample; an integrating sphere with the radius of 2.5-5 cm is adopted to collect all light reflected by the sample, so that the portable color measuring instrument can measure the color of the material sample in a solid state, a liquid state, a powder state or a particle state;
the excellent structure design enables the portable color measuring instrument to be widely applied to color measurement of raw materials and products on production line sites in the fields of cloth, paper, dye, paint, beverage or plastics.
2. A portable colour measuring instrument according to claim 1, characterised in that: the portable color measuring instrument is cuboid in appearance, the length of the cuboid is 18-25 cm, and the width and height of the cuboid are consistent to 8-12 cm; a handle, a measuring button and a touch screen display are designed at the top of the portable color measuring instrument; a circular measuring window is designed at the bottom of the portable color measuring instrument, and the aperture of the measuring window is 0.5-1.0 cm; the portable color measuring instrument has the characteristics of small volume and convenience in carrying.
3. A portable colour measuring instrument according to claim 1, characterised in that: the working principle and the process of the portable color measuring instrument are as follows:
firstly, respectively carrying out zero calibration and standard white board calibration, thereby respectively obtaining light intensity data of each corresponding wavelength in the wavelength range of 360-800 nm of an optical trap and light intensity data of each corresponding wavelength in the wavelength range of 360-800 nm of the standard white board;
secondly, carrying out flash measurement on the measured sample to obtain light intensity data of each corresponding wavelength in the wavelength range of 360-800 nm of the measured sample;
thirdly, the microprocessor calculates the reflectivity spectrum of the tested sample within the wavelength range of 360-800 nm by combining the light intensity data of each corresponding wavelength of the zero calibration and the standard white board calibration;
and fourthly, calculating color parameters of the tested sample in different color spaces by adopting a calculation method of ISO, ASTM or GB/T standard on the basis of the reflectivity spectrum of the tested sample.
4. A portable colour measuring instrument according to any one of claims 1 and 3, characterised in that: the portable color measuring instrument can adopt different color spaces to represent color parameters of a measured sample, and can select and switch among the different color spaces, wherein the adopted color spaces comprise CIE1931 XYZ color space, CIELAB color space and CIELUV color space.
5. A portable colour measuring instrument according to any one of claims 1 and 3, characterised in that: the portable color measuring instrument can select a measuring sample as a reference sample in the process of measuring the sample, and can measure and calculate the chromaticity difference between the measured sample and the reference sample when measuring other samples.
6. A portable colour measuring instrument according to any one of claims 1 and 3, characterised in that: before the portable color measuring instrument is started to measure a sample each time, zero calibration and calibration of a standard white board are required to be carried out; after the zero calibration and the standard white board calibration are carried out each time, after a certain number of sample measurements are carried out, the zero calibration and the standard white board calibration must be carried out again; to ensure the accuracy of the sample measurement, the number of times the sample measurement can be performed between the two zero point calibrations and the standard white board calibration cannot exceed 100 times.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810116882.6A CN108195469B (en) | 2018-02-06 | 2018-02-06 | Portable color measuring instrument |
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| CN201810116882.6A CN108195469B (en) | 2018-02-06 | 2018-02-06 | Portable color measuring instrument |
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| CN108195469A CN108195469A (en) | 2018-06-22 |
| CN108195469B true CN108195469B (en) | 2021-03-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020124451A1 (en) * | 2018-12-19 | 2020-06-25 | 深圳先进技术研究院 | Thin-film coating chroma analysis device and application thereof, and thin-film coating classification method |
| CN111721415A (en) * | 2019-03-20 | 2020-09-29 | 深圳市三恩时科技有限公司 | Color measuring instrument and method for realizing automatic compensation and accurate color measurement based on environmental change |
| CN110672553B (en) * | 2019-10-21 | 2021-11-30 | 四川长虹电器股份有限公司 | Spectrum output compensation method for spectrometer |
| CN111707368B (en) * | 2020-06-19 | 2023-10-17 | 中国计量大学 | Color difference meter based on multichannel spectrum and reflectivity measuring method |
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