Surface Stress Meter

The surface stress meter is a highly specialized measuring instrument adopting photoelastic technology for tempered glass. The primary function of the surface stress meter is to measure the surface stress of tempered glass. This is crucial for ensuring the safety and durability of the glass, as tempered glass is designed to have high surface compressive stress to prevent shattering. Additionally, the device can measure the depth of the stress layer. This is important for understanding the overall stress profile of the glass and ensuring stress meter meets safety standards.

Types of Surface Stress Meter

Surface Stress Meter for Chemically Tempered Glass

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Features of Surface Stress Meter

Automatic determination of qualified or unqualified (OK/NG) products based on operator's pre-setting.

Offer master piece to achieve self-calibration at any time.

Automated stress measurement to ensure high accuracy and stability.

Integrated automatic dripping device and automatic suction device controlled by specific software to save installation space.

Optional glass thickness gauge can be integrated to improve measurement efficiency.

Products

FAQs of Surface Stress Meter

How does a surface stress meter work?

It adopts optical waveguide effect of the ion exchange layer on the glass surface to measure. The divergent light emitted from the light source passes through the slit and is converged by the high refractive index cylindrical prism and becomes parallel light. By adjusting the position of the light source, a beam of parallel light is incident on the interface between the glass and the prism at a critical angle. Due to the stress existing on the glass surface, the light is decomposed into two vector lights whose vibration planes are perpendicular to each other. The two beams of light propagate at different speeds in the ion exchange layer of the glass, so they are refracted to the prism at different total reflection angles. The light emitted from the prism is reflected by the mirror, enters the interference filter, is focused by the telescope system, and then passes through the analysis mirror and is imaged on the reticle to form a light and dark step image. The height of the steps and the number of step lines can be accurately measured through analysis software to calculate the surface stress intensity and the depth of the stress layer.

What materials can be measured with a surface stress meter?

It has been widely used in the quality control for phone glass panel, LCD panel and other chemically tempered glass products.

How to calibrate a surface stress meter?

Users are suggested to use a reference plate with known properties, including refractive index, photoelastic constant, surface stress value, stress layer depth, and glass thickness.