How to measure special substances with spectrophotometer

The spectrophotometer has high accuracy and uses the setting of the pre positioning plate, which eliminates the need to use the standard blackboard and whiteboard in the calibration process of the traditional colorimeter and colorimeter. The built-in software is powerful, including all necessary color equations, standard light sources suitable for different tasks, and a large number of indicators for specific industries and applications

Design principle:
The spectrophotometer is designed according to the principle of spectrophotometer, and the common colorimeter is designed according to the principle of tristimulus value. Color separation and color measurement instrument has high accuracy and increasing versatility. For this reason, it reduces the influence of sample surface, and is particularly suitable for color quality monitoring and computer color matching) and SCE (a measurement method excluding specular reflection. The results of this type of measurement are similar to those of naked eye observation). Because it can measure the reflectivity at each wavelength, it is suitable for complex color analysis.

Measuring principle:
The spectrophotometer can measure the “reflectivity curve” of each color point (10nm or 20nm wavelength interval), and it can simulate a variety of light sources.

Light source:
In the color measuring instrument, the stability, light source orientation, life and the effectiveness of the obtained spectral curve should be considered first when selecting the light source. At present, LED lamp and xenon lamp are mostly used as light sources.

Xenon lamp is mainly used for ultraviolet light source measurement, which can emit short high intensity arc light, but it is difficult to produce repeated arc light of equal intensity. Moreover, the xenon lamp light source requires a relatively complex high-voltage oscillation excitation circuit, and the maintenance is also very complex. When replacing, in addition to replacing the bulb, the whole set of capacitors must be replaced, so the price is expensive.

On the current standard color measuring instruments, the use of LED lamps is technically and economically appropriate. In particular, portable instruments need to be lightweight, power saving, easy to maintain and operate.

How to measure special substances with spectrophotometer:
Translucent substance
When measuring translucent materials, the existence of transmitted light must be considered, and the measured results are likely to be interfered by the background color behind the hand. The thickness of the measured object can be thickened to prevent light penetration, and an opaque black chamber can be added behind it to prevent ambient light from entering the measuring system.

Of course, another more convenient method is to use the DSCD-910 transmission liquid spectrophotometer, which is a high-performance spectrophotometer specially designed to measure the liquid transmittance, absorbance, concentration, chromaticity and other parameters. The instrument adopts D/0 measurement structure, integrates full band light source, single grating light path splitting system, ETC real-time calibration and other technologies, so that the resolution of the instrument reaches 0.0001, the standard deviation of transmittance is within 0.08%, and the chromaticity value: Δ E*ab 0.015。

In addition to measuring the liquid permeability, the instrument also includes APHA/PtCo (APHA/PtCo) and Gardner (Gardner Index) chromaticity scales for resin, solvent, acid, perfume, varnish and other products; Saybolt chromaticity scale for measuring gasoline, white oil, kerosene, lubricating oil and paraffin oil. It eliminates the subjectivity of visual colorimetry and provides greater sensitivity and repeatability.

LISUN lauched Benchtop Spectrophotometer (Transmittance) DSCD-910 is good performance and specially designed for testing the transparent material’s transmittance, absorbance, chromaticity value and other parameters.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

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