GB/T 33051-2016 in English

1. Background and Significance of Standard Formulation

With the wide application of optical functional films in the fields of electronics, automobiles, and construction, the hardness and thickness of the film layer have become important indicators for measuring its performance. The formulation of GB/T33051-2016 fills the gap in the domestic determination method of surface hardened film thickness and provides a technical basis for quality control in related industries.

2. Technical Principle and Analysis

This standard adopts reflection interference spectroscopy, and calculates the optical path difference to obtain the film thickness by analyzing the reflection coherence spectrum generated by vertical incident light at the upper and lower interfaces of the coating. The core formula is as follows:

• Formula (1): I = I₁ +I₂ +2 I₁ I₂cos(2πδ)
• Formula (2): δ = 2ndλ

Wherein, n is the refractive index of the film, d is the film thickness, and λ is the wavelength of the incident light.

3. Implementation suggestions and precautions

Test device selection: Ensure that the light source wavelength range covers 380nm~780nm, and the spectrometer resolution is less than 3nm.

Sample preparation: The sample size is recommended to be 10cm×10cm, and the surface must be free of scratches and other defects. The back can be painted black to reduce secondary reflections.

Calibration requirements: Before each test, a standard wafer with known thickness and refractive index must be used for calibration.

4. Impact of Standard Implementation on the Industry

The implementation of GB/T33051-2016 will help improve the quality control level of optical thin film products and promote the technological upgrading of related industries. It is recommended that enterprises establish a complete film thickness detection system and regularly calibrate and maintain the test equipment.