System for measuring radiance
AssigneeRoygbiv, LLC
InventorEdward Granger
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.
Claims37
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;
- a second polygonal aperture passing radiation from the source to the sensor, said two apertures oriented so that they are rotated relative to each other by an angle to reduce stray radiation that reaches the sensor;
- 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 a first and a second substantially equilateral triangular 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;
- said apparatus further comprising a filter filtering radiation from the source received at the sensor, said filter having a temporal frequency response that matches that of the human eye.
An apparatus for measuring radiance of a radiation source,
- a sensor;
- at least a first and a second substantially equilateral triangular 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 a first and a second substantially equilateral triangular 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;
- said apparatus further comprising at least one color filter filtering the radiation from the source to the sensor so that the apparatus measures the radiance of the source within at least one predetermined spectral pass band.
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.
An apparatus for measuring radiance of a radiation source, comprising:
- a sensor;
- at least a first and a second substantially equilateral triangular 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 the two apertures are oriented so that they are rotated by substantially 60 degrees relative to each other.
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 such that said integrator has a substantially constant resolution at different signal levels.
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 to provide a reading such that the reading has a substantially constant resolution at different signal levels.
Dependencies are inferred from the claim text.