Temperature measurement and control for photohermal processes

Details Temperature measurement and control for photohermal processes Temperature measurement and control for photohermal processes

1989-03-27

1990-09-25

Silverman, Stanley

Coating processes

Electrical product produced

Welding electrode

427 10, 4272481, 427269, 356 48, 356326, 356328, 356334, B05D 306

Patent

active

049592440

ABSTRACT:
The temperature of a surface undergoing a radiation assisted thermally driven process is sensed by observation of the thermal emission from that surface and used to control the process. In a preferred embodiment, the blue edge of the thermal emission spectral distribution is detected to determine the surface temperature of a workpiece during a process such as laser-assisted chemical vapor deposition, and used to control this temperature. The temperature measuring system has means for focusing workpiece thermal emission and defining the field of view, a spectrometer to separate shorter wavelength light from other spectral components of the thermal emission, and a photon-counting system to detect the shorter wavelength light and generate a surface temperature signal. Systems to determine surface temperature at a spot and along a line have an optical prism to disperse the thermal emission into component wavelengths, and a multichannel photon-counting detector comprised of an intensified photodetector array.

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