System for measuring radiance
OwnerEdward Grangerinventor
Life of this patent
Estimating the term…
Abstract
Two or more triangular apertures are employed to pass radiation from a source to a detector to reduce the amount of stray radiation received by the detector. Preferably, the two apertures are equilateral triangles oriented at 60° rotated relative to each other and have dimensions proportional to their distances from the sensor. A Bessel filter is employed to reduce the effect of flicker and other rapid changes in intensity in the radiance from the source. The output of the sensor is integrated and sampled at sampling time intervals that are powers of two of time, and a reading is provided when the output of the integrator exceeds the same threshold under all radiation source intensity conditions so that the meter has a substantially constant resolution at different signal levels.
Claims34
An apparatus for measuring radiance of a radiation source, comprising:
- a sensor;
- at least a first polygonal aperture for passing radiation from the source to the sensor, said sensor responsive to the radiation through the aperture to provide an output;
- and
- a circuit providing a reading in response to the output.
An apparatus for measuring radiance of a radiation source, comprising:
- a sensor;
- at least one aperture for passing radiation from the source to the sensor, said sensor responsive to the radiation through the aperture to provide an output;
- and
- a circuit providing a reading in response to the output, wherein said circuit includes an integrator and a sampling device that samples an output of the integrator at time intervals that are exponential functions of time to provide the reading.
An apparatus for measuring radiance of a radiation source, comprising:
- a sensor;
- at least one aperture for passing radiation from the source to the sensor, said sensor responsive to the radiation through the aperture to provide an output;
- a filter filtering radiation from the source received at the sensor, said filter having a frequency response that matches that of the human eye;
- and
- a circuit providing a reading in response to the output.
A method for measuring radiance of a radiation source, comprising:
- passing radiation from a source to a sensor through an aperture, said sensor responsive to the radiation through the aperture to provide an output;
- and
- integrating the output of the sensor;
- and
- sampling the integrated output of the sensor at time intervals that are exponential functions of time to provide a reading.
A method for measuring radiance of a radiation source, comprising:
- passing radiation from the source to the sensor, said sensor responsive to the radiation through the aperture to provide an output;
- filtering radiation from the source received at the sensor by a filter having a frequency response that matches that of the human eye;
- and
- providing a reading in response to the output.
Dependencies are inferred from the claim text.