Ultraviolet radiation sensor

Claim 2

A UV radiation sensor for measurement of incident UV radiation comprising: a first layer of UV absorptive material arranged to be exposed directly to said incident radiation comprising a plurality of phosphor particles which, in response to the incident UV, emit visible or near visible radiation; followed by filter means for absorbing substantially all UV radiation not absorbed by said phosphor and transmitting said visible or near visible radiation; and means for providing an electrical signal in response to said visible or near visible radiation; whereby solarization of said filter means is avoided.

Claim 3

A UV radiation sensor for measuring the UV component of incident radiation comprising: a first layer comprising a phosphor material chosen to absorb UV and emit visible or near visible radiation in response to absorbed UV; followed by a second layer comprising a filter for absorbing any UV and visible incident radiation passing through said first layer and for freely passing said visible or near visible radiation emitted by said phosphor; followed by means for providing an electrical signal in response to said emitted visible or near visible radiation.

Claim 4

A UV radiation sensor for measuring the UV component of incident radiation comprising: a first layer comprising a phosphor material chosen to absorb UV and emit visible or near visible radiation in response to absorbed UV; followed by a second layer comprising a filter for absorbing any UV and visible incident radiation passing through said first layer and for freely passing said visible or near visible radiation emitted by said phosphor; followed by means for providing an electrical signal in response to said emitted visible or near visible radiation.

Claim 5

An Ultraviolet radiation sensor for measuring the UV component of incident radiation comprising a first layer of UV transmissive material having a plurality of phosphor particles imbedded therein which, in response to the incident UV, emit visible or near visible radiation, said layer passing any visible component of said incident radiation; followed by a second layer comprising a filter for absorbing any UV radiation passing through said first layer and for freely passing said visible or near visible radiation; followed by a third layer comprising a filter or combination of filters for selectively passing said emitted visible or near visible radiation; and for absorbing said visible component of said incident radiation; followed by means for providing an electrical signal in response to said emitted visible or near visible radiation.

Claim 6

An Ultraviolet radiation sensor for measuring the UV component of incident radiation comprising a first layer of UV transmissive material having a plurality of phosphor particles imbedded therein which, in response to the incident UV, emit visible or near visible radiation, said layer passing any visible component of said incident radiation; followed by a second layer comprising a filter for absorbing any UV radiation passing through said first layer and for freely passing said visible or near visible radiation; followed by a third layer comprising a filter or combination of filters for selectively passing said emitted visible or near visible radiation; and for absorbing said visible component of said incident radiation; followed by means for providing an electrical signal in response to said emitted visible or near visible radiation.

Claim 7

A sensor according to claim 3 wherein said second layer and said third layer are combined as a single element.

Claim 8

A sensor as claimed in any of claims 1, 2, 3 or 4 wherein said first layer comprises a fluorinated hydrocarbon sheet having phosphor particles embedded therein.

Claim 9

A sensor for selectively monitoring the 253.7 nanometer emission line radiation from a low pressure mercury vapor source in a low ambient light environment, comprising: a first layer of UV transmissive material having imbedded therein a plurality of phosphor particles whose excitation frequency includes 253.7 nanometers and whose emission frequency is in the visible region above about 550 nanometers; followed by a second layer comprising a filter which absorbs any UV radiation having passed through said first layer having a wavelength below about 400 nanometers and which freely passes visible radiation of a wavelength above about 575 nanometers; followed by a third layer comprising a filter or combination of filters for filtering radiations of wavelengths less than about 575 nanometers; followed by means for providing an electrical signal in response to said visible radiation.

Claim 10

A sensor for selectively monitoring the 253.7 nanometer emission line radiation from a low pressure mercury vapor source in a low ambient light environment, comprising: a first layer of UV transmissive material having imbedded therein a plurality of phosphor particles whose excitation frequency includes 253.7 nanometers and whose emission frequency is in the visible region above about 550 nanometers; followed by a second layer comprising a filter which absorbs any UV radiation having passed through said first layer having a wavelength below about 400 nanometers and which freely passes visible radiation of a wavelength above about 575 nanometers; followed by a third layer comprising a filter or combination of filters for filtering radiations of wavelengths less than about 575 nanometers; followed by means for providing an electrical signal in response to said visible radiation.

Claim 11

A sensor according to claim 6 wherein said second layer and said third layer are combined as a single element.

Claim 12

A sensor according to claim 6 wherein said means for providing an electrical signal is a cadmium sulfide photocell producing substantially zero output to response to infrared incident light.

Claim 13

A sensor for measuring bactericidal efficiency of ultraviolet light comprising: a first layer of UV transmissive material having imbedded therein a plurality of phosphor particles adapted to emit visible radiation in proportion to incident ultraviolet radiation; followed by a second layer comprising a filter for absorbing ultraviolet radiation; followed by a third layer comprising means for absorbing a pre-selected fraction of visible radiation; followed by means for providing an electrical signal proportional to the remainder of said visible radiation.

Claim 14

A sensor for measuring bactericidal efficiency of ultraviolet light comprising: a first layer of UV transmissive material having imbedded therein a plurality of phosphor particles adapted to emit visible radiation in proportion to incident ultraviolet radiation; followed by a second layer comprising a filter for absorbing ultraviolet radiation; followed by a third layer comprising means for absorbing a pre-selected fraction of visible radiation; followed by means for providing an electrical signal proportional to the remainder of said visible radiation.

Claim 15

A sensor according to claim 9 wherein said second layer and said third layer are combined as a single element.

Claim 16

A sensor according to claim 9 wherein said layer of ultraviolet transmissive material is a fluorinated hydrocarbon sheet.

Claim 17

A sensor according to claim 9 wherein said means for providing an electrical signal is a cadmium sulfide photocell producing substantially zero output in response to infrared incident light.

Claim 18

A transducer for converting incident ultraviolet radiation to a lower frequency radiation comprising a fluorinated hydrocarbon sheet having imbedded therein a plurality of phosphor particles.

Claim 19

A transducer for converting incident ultraviolet radiation to a lower frequency radiation comprising a fluorinated hydrocarbon sheet having imbedded therein a plurality of phosphor particles.