A dynamic measurement system and measurement method for material reflectance changing with temperature

Abstract

The invention discloses a dynamic measuring system for material reflectivity changing with temperature and a measuring method. The dynamic measuring system comprises measuring samples, light splitters, reflected light intensity change testing systems and temperature data testing systems. The measuring samples are respectively connected with the corresponding reflected light intensity change testing systems or the temperature data testing systems, and photoelectric conversion triggers are arranged among the reflected light intensity change testing systems and the temperature data testing systems and respectively connected with data acquisition recording devices and the temperature data testing systems. The system has the advantages that in a laser irradiation process, corresponding relations of spatial positions of metal materials, ceramics and high-molecular polymer materials are more accurate, curves of the material reflectivity changing with the temperature can be acquired, laser irradiation heat effects of the materials are analyzed and evaluated, laser parameters are optimized in the process of laser cutting, laser cleaning and the like, laser energy use efficiency is improved, machining cost is reduced and the like.

Description

technical field [0001] The invention belongs to a measurement system in the field of optics, and in particular relates to a dynamic measurement system and a measurement method for material reflectance changing with temperature. Background technique [0002] The interaction between the laser and the material starts from the reflection and absorption of the incident laser energy by the material. The initial reflection characteristics of the material to the laser are related to the laser working system (continuous, pulse, repetition frequency, etc.), laser wavelength, and material type and surface. Conditions, radiation environment and other factors. During laser processing, surface cleaning, etc., materials that absorb laser energy through various coupling mechanisms will produce thermal, mechanical, and chemical responses. These physical, chemical, and other responses of materials lead to changes in their surface properties, which will in turn affect The reflective propertie...

AI Technical Summary

Problems solved by technology

[0004] In the dynamic measurement of material reflectance changing with temperature under laser irradiation by using an integrating sphere reflectometer, the reflectivity of the material surface irradiated by laser is usually measured, and the material surface not irradiated by laser is welded with thermocouples, etc. The temperature measurement method is used to realize the dynamic measurement of the reflectivity of the material changing with the temperature. The curve or data of the material reflectivity changing with the temperature obtained by this measurement method is not the actual spatial position corresponding relationship. Due to the temperature of the material laser irradiation surface Always higher than the non-laser-irradiated surface, so that the temperature variation in the reflectivity versus temperature curve appears to be delayed

In addition, this measurement method requires the material to be in a thin sheet state, and the temperature of the thermocouple measurement point on the surface not irradiated by laser is used to replace the temperature of the reflectance measurement point on the surface irradiated by laser light. However, with the continuous development and progress of material science and technology , it is extremely difficult or impossible to process or process brittle ceramics, polymer materials, etc. in a thin sheet state through traditional mechanical processing, and such materials have the actual situation that thermocouples cannot be welded

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