Non contact roughness measuring instrument is a high-precision instrument that measures roughness by not directly contacting the surface of the measured object. It is widely used in precision manufacturing, materials science, electronics industry and other fields. It uses high-tech sensing technologies such as laser, optics, ultrasound, etc. to measure the microstructure of the workpiece surface. Compared to traditional contact measurement methods, it has many obvious technical advantages and can meet the demand for high-precision, fast, and non-destructive measurement in modern industry.

1、 Working principle

　　Non contact roughness measuring instrumentThe working principle of is based on the changes in surface contour and reflection characteristics, and the roughness data of the surface is obtained by collecting the reflected light information of the object surface. Its common working principles include laser scanning, white light interference, confocal microscopy imaging, and other methods.

1. Laser scanning method: Laser scanning is currently the most common method for non-contact roughness measurement. The laser beam is emitted onto the surface of the workpiece and reflected back after irradiation. By analyzing the intensity, scattering angle, and time difference of reflected light, the height difference at different positions on the surface can be calculated, thereby obtaining the numerical value of surface roughness. This method can quickly and accurately obtain small surface changes and is suitable for workpieces of different materials.

2. White light interferometry: White light interferometry technology utilizes the principle of white light interferometry with different wavelengths to perform high-precision three-dimensional measurements on the surface of an object. White light interferometers can capture small surface changes with high accuracy, typically reaching the nanometer level. This technology is particularly suitable for high-precision measurement tasks such as optical lenses, microelectronic components, etc.

3. Confocal microscopy imaging method: Confocal microscopy technology uses a precise optical system to perform three-dimensional scanning on the surface of the sample. The instrument adjusts the focal length to ensure clear focus on the surface of each pixel. By using confocal microscopy imaging, surface height information can be obtained and surface roughness characteristics can be calculated.

2、 Technical advantages

The non-contact roughness measuring instrument has a series of significant technical advantages, which have made it widely promoted and used in practical applications.

1. High precision and high resolution: It uses advanced optical, laser, and interferometric technologies to achieve precision at the micrometer or even nanometer level. Compared to traditional contact measurement methods, it has smaller measurement errors and higher resolution, especially suitable for high-precision scientific research and manufacturing fields.

2. Fast measurement and high efficiency: Non contact measurement technology greatly improves the measurement speed of roughness. Especially in large-scale production, fast and continuous online detection can be achieved, saving a lot of manual measurement time and improving production efficiency.

3. Non destructive measurement: Unlike contact measurement methods, it does not physically contact the surface of the object being measured, thus avoiding damage or deformation to the sample surface. This characteristic makes it particularly important for measuring soft materials, small parts, or high-value items, ensuring the accuracy and repeatability of measurement results.

4. Strong adaptability: able to measure workpieces of different shapes, sizes, and materials. Whether it is a flat, curved or complex shaped surface, efficient measurement can be carried out. Especially in measurement tasks that require high surface microstructure, non-contact instruments can provide better adaptability.

The non-contact roughness measuring instrument has become an important tool in modern precision manufacturing and quality inspection due to its high precision, non-destructive, and fast technical advantages. With the continuous advancement of technology, the application scope of these instruments will be further expanded, helping various industries achieve higher standards of production and quality control.