Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1991-12-24
1993-04-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
21912162, G01J 132
Patent
active
052045170
ABSTRACT:
A method for removing material from a structure, comprising the steps of: (1) generating a light beam; (2) irradiating the surface material of a structure with the light beam having an intensity sufficient to ablate the surface material and to cause the surface material to generate spectral emission signals having intensities; (3) scanning the structure with the light beam at a scan speed; (4) monitoring the spectral emissions to detect a selected one of the spectral emission signals having a selected wavelength and generating an electronic output signal representative of the intensity of a selected one of the spectral emission signals in response to detecting the selected one of the spectral emission signals; (5) determining an updated scan speed functionally related to the electronic output signal; and (6) directing the scan speed to be equal to the updated scan speed. A second embodiment determines the updated scan speed based on the intensity of spectral emission signals detected during predetermined intervals while the structure is illuminated by the light source. A third embodiment determines an updated scan speed based on the intensity of spectral emission signals resulting from a laser pulse irradiating the structure when the output of the light beam is approximately at a minimum.
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Cates Michael C.
Hamm Richard R.
Hoogerwerf John D.
Le Que T.
Maxwell Laboratories Inc.
Nelms David C.
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