In many industrial sectors, the color of a liquid is an important quality indicator. Whether it's food, cosmetics or chemicals, the stability and consistency of color is directly related to the quality of the product and the consumer experience. Therefore, it is particularly important to measure the color difference of liquids. This article will explain how to use a colorimeter to measure the color difference of liquids, and what to pay attention to during use.
First, the working principle of the colorimeter.
A colorimeter is an instrument that evaluates chromatic aberration by measuring the reflected light of an object's color. It uses an integrating sphere to collect the reflected light from the surface of an object and decompose it into three color channels: red, green, and blue. The instrument then compares these color values to the standard color to calculate the difference and thus the difference.
Second, the use of colorimeter.
1.Calibrate the instrument.
Before using a colorimeter, it must be calibrated. The purpose of calibration is to ensure the accuracy of the instrument so that the measurement results are more reliable. Calibration operation according to the instrument manual.
2.Prepare the samples.
In order to obtain accurate measurement results, it is necessary to ensure that the sample is representative. For liquid samples, measurements can be made using clear glass or plastic containers. Pour the liquid into the container, making sure the liquid level is flat and free of air bubbles.
3.Measure color aberration.
Place the sample cuvette on the transmission port of the instrument to ensure that the instrument is in full contact with the liquid level. Press the measurement button and the instrument will automatically take the measurement and display the color difference value. The chromatic difference value is usually expressed in the form of Lab or LCH, where L is the brightness, A is the red-green degree, and B is the yellow-blue degree.
4.Record data.
After the measurement is completed, the color difference value is recorded. If multiple measurements are required to obtain an average, repeat the above steps. All data are recorded in ** for subsequent analysis and comparison.
5.Clean the instrument.
Always clean the surface and interior of the instrument after use. Use a soft, damp cloth to wipe the surface of the instrument, then dry with a dry cloth. Perform internal cleaning and maintenance in accordance with the requirements of the instrument manual.
3. Precautions.
The accuracy of the instrument is critical. It is important to calibrate and maintain the instrument regularly to ensure its accuracy.
When measuring, make sure that the liquid level is flat and free of bubbles. Air bubbles can affect the reflection of light, resulting in inaccurate measurements.
When measuring under different light sources, it is necessary to ensure the stability and consistency of the light source. Otherwise, changes in the light source will affect the measurement results.