Usage of Portable Spectrophotometer

The colorimeter and the Portable Spectrophotometer are widely used in the field of color management in industries such as plastic, printing, paint and ink, textile and clothing. According to the Lab and Lch principles of CIE color space, it measures and displays the color difference △ E and △ Lab values between the sample and the tested sample.

Classification: Color difference meters can be divided into:
1. A portable color difference meter, also known as a chroma meter, can directly read data and cannot be connected to a computer without software. Easy to use, inexpensive, but with low accuracy. Widely used in the general field of color management.

2. Portable colorimeter, also known as a portable spectrophotometer, can not only directly read data, but also connect to a computer with software. Small size, easy to carry, high accuracy, and moderate price.

3. Benchtop color difference meter, also known as a benchtop spectrophotometer, has a reading window and uses color measurement and matching software when connected to a computer. It has high-precision color measurement and matching functions, has a large volume, stable performance, and high price.

Main features:
① Automatically compare the color difference between the template and the inspected product, and output CIE_ Three sets of Lab data and four sets of color difference data after color comparison, including △ E, △ L, △ a, and △ b, provide a reference scheme for color matching.

② It has two measurement modes, sample and single, to meet the needs of measurement in different places, with simple operation and accurate measurement.
③ The instrument is portable. There are two power supply methods: battery and external power supply, which are convenient and practical.

④ Equipped with a USB expansion interface, it can be connected to the computer for display. Correlation analysis method: automatically compare the color difference between the sample plate and the tested object, and output three groups of data (L, a, b) and four groups of color difference data (△ E, △ L, △ a, △ b) after color comparison. The size of the total color difference Δ E Δ L+represents white, Δ L – represents black, Δ a+represents red, Δ a – represents green, Δ b+represents yellow, Δ b – represents blue

What is a portable Spectrophotometer?
Color difference refers to the difference in color observed by the human eye, which can be color difference, such as red, yellow, and green; It can also be a difference in brightness, such as deep blue or light blue. The traditional method of color difference resolution is the subjective evaluation of the observer.

However, due to the color discrimination differences among different observers, it is difficult to unify people’s understanding of color. In order to accurately evaluate product color, measurements can be made using a color difference meter.

Color difference meters can be divided into desktop, portable spectrophotometer, and small portable color difference meters. The scope of application and color measurement accuracy of different types of color difference meters vary.

Usually,  portable spectrophotometers have better measurement accuracy and are mainly used in laboratories and various scientific research institutions; Portable spectrophotometer can achieve the detection of uneven surface of the tested object, such as granular fabrics, fabrics, wood, stones, bricks, etc; The small portable color difference instrument is a fast detection instrument suitable for construction sites. Therefore, portable color difference meters are also widely used, suitable for measuring reflection colors and color differences in various fields.

Usage of portable Spectrophotometer:
The measurement principle of the portable Spectrophotometer is to measure the spectral tristimulus value of the reference sample and the sample, so that the color difference between the sample and the reference sample can be measured quantitatively.

The geometric structures commonly used in color difference meters are divided into two types: directional and integrating sphere. The directional geometric structures are divided into two types: 45 °/0 ° and 0 °/45 °. 45 °/0 ° refers to the light illuminating the sample in the 45 ° direction, and the detector receives reflected light in the vertical direction; And 0 °/45 ° refers to the reflection of light in the 45 ° direction when the sample is irradiated vertically.

These two types of instruments do not include specular reflection light at all, and their measured data is consistent with human eye observation. In addition, this type of instrument can only measure the color of opaque samples; The geometric structure of the integrating sphere is divided into two types: d/8 ° and 8 °/d. The instrument of the integrating sphere structure is that light illuminates the sample in the horizontal direction, and the detector receives reflected or transmitted light in the direction of 8 ° with the sample. This instrument can not only measure the color of opaque samples but also transparent samples.

When using a portable Spectrophotometer for measurement, it is necessary to choose a standard light source, standard chromaticity observer, color space, and observation aperture. Measure the chromaticity coordinate values of the reference sample CIELAB L *, a *, b * or HunterLab L, a, b under the selected instrument conditions, and then measure the chromaticity coordinate values of three different parts of the sample under the same conditions.

If we judge a color solely based on a set of L * a * b * values, it does not have much practical significance. However, when we compare two colors, we can determine the difference between them based on the difference in their parameters.

By comparing the parameter values of the product and standard color samples, we can easily determine the current color status of the product. We can calculate the color difference between two colors through two sets of L * a * b * values, and the color difference is calibrated using △ Eab *, △ L *, △ a *, and △ b *.

If the directional portable colorimeter is non circular lighting, the same measuring point of the reference sample and the sample shall be rotated 90 ° in four directions to measure the four chromaticity coordinate values, and the arithmetic mean value is the chromaticity coordinate value of the measuring point.

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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