Two-dimensional resolution pyrometer for real-time monitoring of temperature image in laser materials processing

The main characteristics of the developed two-dimensional resolution pyrometer are the following: temperature range 1000–4700°C; sampling time (17 μs for each channel) suitable for temperature image monitoring both for continuous wave and pulsed (millisecond range) laser action; spatial resolution 250 μm (10×10 points for measured area 2.5×2.5 mm) compatible with the typical size of the laser focus spot. The developed instrument has been tested under conditions of free-running Nd:YAG pulsed laser action on Ti, Al, Cu, and stainless steel (pulse duration 1–20 ms, pulse energy 10–40 J).