1. The color sensor, also known as the color sensor, is a machine that compares the color of the object with the reference color that has been taught earlier to detect the color.
The standard color measurement method is to use a spectrophotometric colorimeter to measure the tristimulus value of the sample to obtain the color of the sample.
There are a wide variety of colors in nature, and among all colors, except for bird feathers and the like that produce color due to interference, the selective absorption of light by objects is the main reason for the production of color. Color detection and the identification of color changes play an important role in industrial applications, for example, in the industrial field to monitor production processes and product quality; In electronic reproduction, it can be used to achieve true reproduction of colors regardless of ambient temperature, humidity, paper and toners; In medicine, color is often an indicator of disease and can be used to study pathologies; In commodity packaging, automatic control can be realized through the detection of the color of two adjacent labels of a wrapper, and the number of various colors can be automatically counted in the automatic color count.
2. Classification of color sensors
1. RGB color sensor
Measurement mode: one is to analyze the proportion of red, green and blue light, and the second is to use the reflected light intensity of red, green and blue primary colors to test the detection purpose.
Application: Plant pigments; water quality analysis; Skin cholesterol.
2. Chromatic aberration color sensor
To detect the color difference between the measured object and the standard color, it is not necessary to know the specific color of the measured object exactly, but only need to identify and judge the color difference of the two objects to distinguish the change from one color to another.
Applications: sorting, quality monitoring and other industries; Reading and controlling colors such as pulp, paint, and colored steel plates; Color management of household appliances and car shells.
Third, the difficulty of color detection
The color information of objects is very extensive, and the determination of color requires the stimulation values of the three elements of hue, brightness and saturation or the three primary colors (red, green, and blue). The parameters that affect the accuracy of color detection mainly include: irradiated light, object reflection, light source orientation, observation orientation and sensor performance, etc., and any change in any parameter will lead to a change in the observed color.
1. The influence of light source;
2. The influence of the orientation of the light source and the orientation of observation;
3. The influence of the reflection condition of the surface of the measured object.
Fourth, the future development direction of sensors
In modern industrial production, sensor applications are becoming more and more complex, so the demand for more precise and reliable color sensors is also increasing. Its future development direction is: 1. Reduce the manufacturing cost of existing sensors and facilitate large-scale industrial use; 2. With the continuous emergence of new technologies and new materials, develop color sensors based on new principles, high sensitivity and fast response; 3. Combined with other sensors, the information measured by a variety of sensors is fused together by modern information fusion technology to form a comprehensive color sensor.
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