Working principle of spectrophotometer

Spectrophotometer is a color measuring instrument with excellent performance, wide use, and easy operation. This instrument is suitable for color detection and color difference control of complex products in industry, such as measuring the reflected and transmitted colors of objects, while also measuring the whiteness, chromaticity, and the most basic color difference between two objects. The spectrophotometer is designed to provide a 45 °/0 ° geometric viewing angle suitable for human eye observation. It displays the reflectance and transmittance of a single object in the visible light band of 300nm-700nm, and is connected to a computer through an interface to expand more functions.

Working principle of spectrophotometer:

Spectrophotometer is an instrument that measures the color of an object by spectral photometry based on optical colorimetry. It consists of a light source, an integrating sphere, a spectrometer, a detector, and a data processing system. The main purpose of the development and mass production of this instrument is to facilitate users to intuitively and reliably analyze color data, transfer color information, and replicate color images. Currently, both domestic and foreign color management instrument companies are working hard on spectrophotometer, striving to develop and produce more suitable and practical instruments.

Currently, in industrial production, spectroscopic colorimeters are mainly used in industries where color requirements are relatively strict and difficult to control, such as textiles, printing and dyeing, coatings, metallic paints, glass coatings, paint films, building materials, printing, and so on. Using spectroscopic colorimeters to quantitatively compare and analyze the color information of products can be readily understood. At the same time, connecting to a PC can clearly restore color information, providing the best guarantee for color transmission and reproduction.

（ λ） Multiply the CIE spectral triple excitation values and integrate these products over the entire visible spectrum range. ⏵ According to the standard colorimetric system specified by the International Commission on Illumination CIE, the calculation method of the third excitation value of color is the color stimulus function

This formula is the main basis for color detection by a spectrophotometer, and can perfectly convert the measured color brightness, brightness, and chroma information into different color information, ultimately achieving the measurement of whiteness, chroma, and color difference.

（ λ） It can be represented as equal to three different objects under test. ⏵ wherein

（ λ）= S（ λ）—— Relative spectral power distribution (self luminescent body) ⏴

（ λ）=β （ λ） S（ λ）—— The product of the reflectance factor and the relative spectral power distribution of a standard illuminant. 

（ λ） S（ λ）—— The product of the transmittance factor and the relative spectral power distribution of a standard illumination body（ λ）= 

At the beginning of the development of spectroscopic colorimeters, researchers generally consider configurations suitable for different industries, products, and measurement environments, including the selection of light sources (A, C, D65, D50, and so on), and a variety of color difference formulas to choose from. In addition, tolerance ranges can be set based on product qualification requirements, which can quickly detect product color differences, and is suitable for controlling color in large-scale industrial production.

Among the products developed so far, the digital spectrophotometer has the highest measurement accuracy, the most complete measurement functions, and the most complete analysis results. This instrument is designed and manufactured based on spectrophotometer analysis. We know that light is observed by the human eye in the form of electromagnetic waves. Different wavelengths of light present different colors to us on the spectrum, with red light having the longest wavelength and purple light having the shortest wavelength. The others are arranged in order of red, orange, yellow, green, indigo, and purple. Spectrocolorimeters analyze these lights using spectral rules.

Generally, a spectrophotometer has a composite sensor to measure the spectral reflectance of an object’s wavelength. A microprocessor is used to calculate the spectral reflectance data using the chromatic aberration calculation method equipped inside the spectrophotometer to calculate the third excitation value. With three excitation values, we can calculate the color information we need based on the different color space calculation formulas provided by CIE.

For a spectrophotometer, it not only has all the functions and features of a general color difference meter, but also has higher sensitivity. Because the spectral sensor measures light at various wavelength intervals, the color difference meter is generally between 0.01 and 0.02 for △ E * ab, which can be said to have very small error. The measurement speed is much faster than ordinary color difference meters, which can be both measured and the measurement time is around 0.3 seconds. This application in batch industrial production color detection can greatly improve the speed of color detection and improve production efficiency.

The RS-232C standard USB interface can be used to link a computer to process and analyze color information directly using the color management software in the computer. SANC’s color detection instruments are directly equipped with color management software, including spectrophotometer. Upon receiving the product, the software can be directly installed on the computer and linked to the spectrophotometer for debugging and use. At the same time, the software management system on the computer is also conducive to remote control and communication of colors.

Spectroscopic colorimeters can perfectly achieve color detection, analysis, transmission, communication, and reproduction, which are the most common functional requirements for using this instrument in industry today. So a spectrophotometer can help you solve all color problems. It’s a great way to get more with one stroke.

HSCD-860 Innovative 5-micron-thick nano-integrated optical device innovation is the soul. After nearly 10 years of painstaking research, the instrument uses nano-integrated optical devices as spectroscopic devices, and only 5 microns thick optical devices can achieve nano-level spectroscopic capabilities, once again leading the direction of industry innovation and surpassing the technology of foreign products. The blockade has greatly improved the technical performance of the product.

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