PHOTOELECTRIC PEOPLE COUNTING DEVICE
First Claim
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1. A low-power people-counting system, comprising:
- at least a first uncollimated light source, wherein the first light source operates according to a duty cycle between about 0.1% and 10%; and
at least a first light detector adapted to continuously and selectively sense radiant output of the first light source.
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Abstract
Embodiments of the invention may include a low-power people-counting system and related methods. Such a system may include a pair of uncollimated light sources operating at a relatively low duty cycle. Light from the sources may be detected using devices adapted to discriminate between light based on the source from which it was omitted.
5 Citations
20 Claims
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1. A low-power people-counting system, comprising:
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at least a first uncollimated light source, wherein the first light source operates according to a duty cycle between about 0.1% and 10%; and at least a first light detector adapted to continuously and selectively sense radiant output of the first light source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A low-power people-counting system, comprising:
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a first uncollimated light source and a second uncollimated light source having a predetermined fixed spacing therebetween and disposed along a direction of travel of an arbitrary body, wherein the first and second light sources differ in one or more of frequency or polarization, and wherein the first and second light sources operate according to a duty cycle between about 0.1% and 10%; a first light detector adapted to continuously and selectively sense radiant output of the first light source; and a second light detector adapted to continuously and selectively sense radiant output of the second light source. - View Dependent Claims (16, 17, 18, 19)
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20. A low-power people-counting system, comprising:
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a first uncollimated light source and a second uncollimated light source having a predetermined fixed spacing therebetween and disposed along a direction of travel of an arbitrary body, wherein the first and second light sources differ in one or more of frequency or polarization, and wherein the first and second light sources operate according to a duty cycle between about 0.1% and 10%; a first light detector adapted to continuously and selectively sense radiant output of the first light source; a second light detector adapted to continuously and selectively sense radiant output of the second light source; a means of determining the direction of travel of an arbitrary body passing between the first and second light sources and the first and second light detectors based on the order in which a first light beam and a second light beam are broken; a radio frequency transmitter adapted to broadcast digital data packets encoding data from the first and second light detectors; and a radio frequency receiver adapted to receive the digital data packets transmitted by the transmitter and communicate the digital data packets to an external computer, wherein the radio frequency transmitter and the radio frequency receiver lack circuitry and/or programming for affirmatively avoiding data packet collisions.
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Specification