Test translucent material with spectrophotometer

The spectrophotometer is designed according to the principle of spectral type, while the ordinary colorimeter is designed according to the principle of tristimulus type. The colorimeter has high accuracy and increasing versatility. For this reason, it reduces the influence of sample surface, especially suitable for color quality monitoring and computer color matching) and SCE (a measurement method to eliminate specular reflection. The results obtained by this type of measurement are similar to those observed by the naked eye). Because it can measure the reflectivity at each wavelength, it is suitable for complex color analysis.

The existence of transmitted light must be considered when the spectrophotometer is measuring translucent materials. 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 cavity can be added to prevent ambient light from entering the measuring system.

Of course, there is another more convenient way to use DSCD-910 transmission liquid spectrophotometer, which is a high-performance spectrophotometer specially designed to measure liquid transmittance, absorbance, concentration, chroma and other parameters. The instrument adopts the D/0 measurement structure, integrates the full-band light source, single-grating optical 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 color 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.

Glass and liquid color

Gardner chromaticity is widely used in the fields of petroleum, printing and chemistry, such as the determination of transparent liquids such as resin, varnish, paint, dry hot oil, fatty acid, lecithin, sunflower seed oil and flaxseed oil.

Gardner Color Scale is a dimension to measure the depth of yellow. Gardner Color Scale is divided into 18 grades according to the chromaticity of standard filter from 1 (light) to 18 (deep). The larger the number, the darker the color. The internationally accepted chromaticity is an even grade of 2-16.

Defects of standard solution colorimetry：
1、 The preparation process of Gardner standard solution is complex
First, pipette the potassium chloroplatinate solution into eight 25mL volumetric flasks according to the amount shown in the table in Figure 2, and dilute it to the scale with dilute hydrochloric acid solution. The prepared solution is Gardner color code 1~8.
Use a pipette to transfer cobalt chloride solution and ferric chloride solution into 10 100mL volumetric flasks according to the amount shown in Table I (continued) of Figure 3, and dilute them to the scale with dilute hydrochloric acid solution. The prepared solution is Gardner color code 9-18.

2、 Storage difficulties
Gardner color code prepared in accordance with the Standard for the Determination of Color of Transparent Liquids (Gardner Color) shall be stored in a dark place and sealed. Check with the reference solution at least once every half a year. If the color is found to be different from that of the corresponding potassium dichromate sulfate reference solution, it should be prepared again.
With the passage of storage time and the influence of external environment such as temperature and light, the chromaticity value of standard solution may change, which will affect the accuracy of colorimetry.

3、 Limitations of human eye color measurement
Color is a visual effect produced by light stimulation of the human eye. The human eye’s perception of color is not quantifiable, and will be affected by light source, observation angle, object size, background, object shape and other factors. Therefore, human eye color measurement is limited. Accurate measurement with spectrophotometer. DSCD-910 desktop spectrophotometer stores 18 Gardner standard solution parameters in the instrument, which can easily complete the colorimetric task and solve the limitations of human eye color measurement.

Installation and use of color quality management software for spectrophotometer：
1、 Precautions for installation of color quality management software Color QC of spectrophotometer:
①. Load the CD of Color QC software into the computer
②. Open “My Computer”, find Color QC in the driver, and click to install; After installation, the interface shown below will be displayed;
③. Please refer to the steps in the manual for specific installation details.
Select USB communication through the UP and DOWN keys, and confirm with the ENTER key

2、 Connect communication port
①. First, prepare the spectrophotometer, data cable and computer
②. Connect the spectrophotometer and computer with USB cable;
③. Open the spectrophotometer, click “Cancel” to enter the interface, listen to “UP” and “DOWN”, select “USB communication” and click “enter” to connect;
④. The display of USB connected (as shown in the figure) indicates that the connection is successful.

3、 First use of color quality management software Color QC
①. Check that “USB communication” is connected successfully;
②. Perform black and white calibration;
③. Set the tolerance Δ E is different. Generally, if the requirement is within 1, then the sample with the result within 1 is qualified; The higher requirements are generally set within 0.5, which can be set according to different requirements
④. Collect standard samples and samples. As shown in the figure, you can name and save the name of the standard sample and sample independently;
⑤. The measured sample data can be saved for future use. Click the data to be saved and then click “++Library” to save it;
⑥. The established database is as follows

4、 What should I do if the “USB communication” of the spectrophotometer is “unable to connect”?
①. When the spectrophotometer and the computer are connected abnormally, the phenomenon of “unable to connect” appears. At this time, you should check whether the USB cable is well connected with the spectrophotometer and the computer. You can plug and unplug the USB cable again to check whether the contact is good, and exit the “USB communication” interface of the spectrophotometer and re-enter the “USB communication” interface.
②. Under the condition that the USB cable is well connected with the spectrophotometer and the computer, restart the spectrophotometer, enter the main menu of the spectrophotometer, select “USB communication”, press the “enter” key on the spectrophotometer, and let the spectrophotometer enter the communication state.
③. Close the Color QC software and reopen the Color QC software.
④. Replace the USB cable or replace a USB oral test on the PC.
The above are the operation methods and problems that may occur during the use of color QC, the spectrophotometer software. I hope to solve some problems for you!

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

The instrument adopts the geometry of D/0, integration of the full band LED composite light source, double beam optical system, ETC every-test calibration technology, which makes the instrument reaches a resolution of 0.0001, deviation of the transmittance within 0.08% and chromatic value △E*ab 0.015.

DSCD-910_Benchtop Spectrophotometer (Transmittance)

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