Insulating glass thickness gauge has three main principles: simple tool measurement, optical measurement and light refraction. Each measurement principle has its own characteristics.

Due to the different types and shapes of glass in life, we measure the thickness of different types of glass differently. Common products are flat glass, curved glass, single-layer glass, multi-layer insulating glass, laminated glass, etc. So how to measure the thickness of these glasses, what is the principle of insulating glass thickness gauge? Let's take a look.

1. Simple tool measurement

Common methods for measuring glass thickness in daily life include vernier calipers, micrometers, zero-scale extension rulers, etc. The advantage of this measurement method is that the measurement data is accurate and intuitive. The disadvantage is that this measurement method must contact both sides of the glass to achieve data measurement. The thickness of installed glass, glass curtain wall, insulating glass, laminated glass, etc. cannot be accurately measured.

2. Principle of optical glass thickness measurement

This measurement method is mainly based on the principle of optical triangulation. In short, it is an optical measurement method based on the collinear equation, which uses the triangular relationship between the object, the light source and the camera to directly solve the geometry. This measurement method usually employs an optical path. The main defects are as follows:

2.1) Different types of glass will cause uneven thickness or uneven surface due to processing and other reasons, which will cause a large deviation in the direction of the emitted light, thus affecting the measurement accuracy.

2.2) The interior of the installed insulating glass will change due to changes in light, temperature, air pressure, etc., which will lead to changes in the entire thickness. Different angles will appear at different positions of the glass, which will lead to errors in the thickness of the hollow.

3. Light refraction

This measurement principle is based on the principle of optical triangulation thickness measurement, combined with adaptive calibration method, sub-pixel detection technology, dual optical path and other methods to comprehensively measure the glass thickness. The technology has high measurement accuracy and stable test results. This test method is also the most widely used method for high-precision glass thickness gauges.

The measurement principle is simple, two light sources located in a photodiode linear array sensor each emit a beam of light. After refraction and reflection, a reflected light spot is formed on the receiving surface of the sensor. The spot position has a certain corresponding relationship with the glass to be tested. After calibration, the thickness of each layer can be calculated. Measurement errors can be reduced by calculating the values ​​of the two optical paths.