Portable handheld artificial light detector
First Claim
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1. A light detector comprising:
- a photodetector operative to convert received light into an electrical signal;
an amplifier coupled to said photodetector, said amplifier operative to amplify an output signal of said photodetector;
a first filter coupled to receive an output signal of said amplifier, the first filter operative to output an AC signal indicative of only one type of artificial light;
a first indicator directly coupled to an output of said first filter, the first indicator having a first indication device;
a second filter coupled to receive an output signal of said amplifier, the second filter operative to output an AC signal indicative of a type of artificial light different than that of the first filter; and
a second indicator directly coupled to an output of said second filter, the second indicator having a second indication device;
wherein;
a first filter AC output signal of sufficient strength causes the first indicator to activate the first activation device unless a stronger second filter AC output signal is received simultaneously by the second indicator; and
a second filter AC output signal of sufficient strength causes the second indicator to activate the second activation device unless a stronger first filter AC output signal is received simultaneously by the first indicator.
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Abstract
A portable, handheld artificial light detector distinguishes artificial light from sunlight and identifies low-frequency artificial light from high-frequency artificial light. Artificial light includes light from a lamp powered by an AC source. Low frequency light includes, for example, light produced by a magnetic luminaire ballast, while high frequency light includes light produced by an electronic luminaire ballast.
20 Citations
16 Claims
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1. A light detector comprising:
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a photodetector operative to convert received light into an electrical signal; an amplifier coupled to said photodetector, said amplifier operative to amplify an output signal of said photodetector; a first filter coupled to receive an output signal of said amplifier, the first filter operative to output an AC signal indicative of only one type of artificial light; a first indicator directly coupled to an output of said first filter, the first indicator having a first indication device; a second filter coupled to receive an output signal of said amplifier, the second filter operative to output an AC signal indicative of a type of artificial light different than that of the first filter; and a second indicator directly coupled to an output of said second filter, the second indicator having a second indication device;
wherein;a first filter AC output signal of sufficient strength causes the first indicator to activate the first activation device unless a stronger second filter AC output signal is received simultaneously by the second indicator; and a second filter AC output signal of sufficient strength causes the second indicator to activate the second activation device unless a stronger first filter AC output signal is received simultaneously by the first indicator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification