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US 5,248,880 AGranted
Detector system for detecting the occurrence of welding
AssigneeOSD Envizion Company
InventorJohn D. Fergason
Life of this patent
Estimating the term…
Abstract
A sensor circuit for detecting light hazards or bright light sources that will cause discomfort. The sensor and sensor electronics which provide a wide sensitivity range which is fully automatically adjustable, and which has the ability to detect point sources of light. The sensor further has the ability to distinguish low power stable light generated from a small welding arc from bright ambient light or even direct sunlight.
Claims44
A detector system for detecting the occurrence of welding, comprising:
- detector means for receiving a light input and producing an output representative thereof,
- threshold signal means for establishing a comparison output threshold;
- feedback means coupled with respect to said threshold signal means for tending to set and maintain within a predetermined range such output threshold of said threshold signal means as the intensity of said light input varies, said feedback means having a relatively slow time constant.
A detector system for detecting the occurrence of welding, comprising:
- detector means for receiving a light input and producing an output representative thereof,
- comparator means for producing a comparison output, said comparator means including a means for comparing such output of the detector means with respect to a threshold signal limit,
- threshold feedback means for monitoring the detector means and resetting the threshold signal limit based on the detector means output level.
A detector system for detecting the occurrence of welding, comprising:
- detector means for detecting incident light and for producing an output signal as a function of the intensity of said incident light, said incident light at times including high intensity light associated with the occurrence of welding;
- comparator means for comparing said output signal to a threshold signal and for providing a system signal indicating the occurrence of welding based on said comparison;
- and
- threshold signal developing means for developing said threshold signal, wherein the magnitude of said threshold signal is a function of the intensity of said incident light.
1 more element
A detector system, comprising:
- sensor circuit means comprising a photodetector for providing an output signal as a function of the intensity of incident light;
- sensitivity feedback means for automatically adjusting a response characteristic of said photodetector output signal as a function of the rate at which the intensity of said incident light changes with respect to time;
- and
- comparator means for comparing said output signal to a threshold signal to produce a control signal.
1 more element
A protection system, comprising:
- sensor circuit means comprising a photodetector for providing an output signal as a function of the intensity of incident light;
- sensitivity feedback means for automatically adjusting a response characteristic of said photodetector output signal to changes in the intensity of said incident light as a function of the rate at which the intensity of said incident light changes with respect to time;
- comparator means for comparing said output signal to a threshold signal to produce a control signal;
- and
- light shutter means for controlling the transmission of light therethrough as a function of said control signal.
2 more elements
A detector system, comprising:
- sensor means for providing an output signal as a function of intensity of incident light;
- and
- sensitivity means for adjusting a response characteristic of said sensor means output signal to changes in said intensity.
The detector system, comprising:
- detector means for producing an output signal as a function of intensity of incident light;
- comparator means for comparing said output signal to a threshold signal to produce a comparison output;
- and
- threshold signal developing means for developing said threshold signal, wherein said threshold signal developing means tends to adjust said threshold signal to a level about that of said output signal as a result of said output signal level falling below said threshold signal level, and tends to adjust said threshold signal to another level which is below that of said output signal as a result of said output signal level rising above said threshold signal level.
1 more element
Dependencies are inferred from the claim text.