Optical system with an extended, imaged source

Claim 2

A respiratory and anesthetic gas analyzer, comprising: an elongated source of infrared radiation for transmitting polychromatic infrared radiation that encompasses a 7 to 10 micrometer wavelength range, said elongated source having a first longitudinal axis; a detector array for substantially simultaneously detecting said polychromatic radiation across the wavelength range and including a detector array surface, the detector array having a second longitudinal axis; optical imaging means for defining an optical path for imaging said source onto and across said detector array surface, wherein infrared radiation from said source impinging on said detector array surface defines an image of said elongated source, and wherein the first longitudinal axis of the source, when imaged on the detector array surface, is aligned with the second longitudinal axis of said detector array; a gas sample chamber, including a sample gas to be analyzed, disposed on the optical path.

Claim 3

The apparatus of claim 1, further comprising a linear variable filter disposed between the source and the detector array surface and having a center axis, the center axis being aligned with the first and second longitudinal axes when the source is imaged on the detector array surface.

Claim 4

The gas analyzer of claim 2, wherein the source, filter, and detector array are arranged in an aligned upstanding orientation.

Claim 5

The apparatus of claim 1, wherein said source comprises a substantially planar radiation emitter surface.

Claim 6

The apparatus of claim 1, wherein said source comprises two, oppositely facing substantially planar radiation emitter surfaces.

Claim 7

The apparatus of claim 1, wherein said source has a primary radiation band including the 7 to 10 micrometer wavelength range.

Claim 8

The apparatus of claim 1, wherein said source operates at a temperature greater than 900° C.

Claim 9

The apparatus of claim 1, wherein said source operates at a temperature of at least about 1200° C.

Claim 10

The apparatus of claim 1, wherein said detector surface is dimensioned to substantially match said image of said source.

Claim 11

A gas respiratory and anesthetic analyzer, comprising: an elongated radiation source for emitting polychromatic radiation including the 7 to 10 micrometer wavelength range, the elongated radiation source having a first longitudinal axis; a detector array for substantially simultaneously detecting the polychromatic radiation across the wavelength range and including a detector array surface, the detector array being aligned relative to a second axis; optical imaging means for defining first and second optical paths from said source to said detector array, wherein radiation sequentially passing along the first and second optical paths and impinging on said detector surface defines an image of said source across said detector array surface such that the first longitudinal axis of the source, when imaged on the detector array surface, is aligned with the second axis; and a gas sample chamber, including a sample gas to be analyzed, disposed on at least one of said first and second optical paths.

Claim 12

A gas respiratory and anesthetic analyzer, comprising: an elongated radiation source for emitting polychromatic radiation including the 7 to 10 micrometer wavelength range, the elongated radiation source having a first longitudinal axis; a detector array for substantially simultaneously detecting the polychromatic radiation across the wavelength range and including a detector array surface, the detector array being aligned relative to a second axis; optical imaging means for defining first and second optical paths from said source to said detector array, wherein radiation sequentially passing along the first and second optical paths and impinging on said detector surface defines an image of said source across said detector array surface such that the first longitudinal axis of the source, when imaged on the detector array surface, is aligned with the second axis; and a gas sample chamber, including a sample gas to be analyzed, disposed on at least one of said first and second optical paths.

Claim 13

The gas analyzer of claim 10, further comprising a polychromatic filter disposed along at least one of the first and second optical path, the filter having a third longitudinal axis that is aligned with the first and second longitudinal axes.

Claim 14

The gas analyzer of claim 10, wherein said source comprises a substantially planar radiation emitter surface.

Claim 15

The gas analyzer of claim 10, wherein said source operates at a temperature greater than 900° C.

Claim 16

The gas analyzer of claim 10, wherein said source operates at a temperature of at least about 1200° C.

Claim 17

The gas analyzer of claim 10, wherein said detector surface is dimensioned to substantially match said image of said source.

Claim 18

The gas analyzer of claim 10, wherein said gas sample chamber is disposed between said optical imaging means and said detector.

Claim 19

The gas analyzer of claim 10, wherein a first radiation portion is passed along the first optical path and a second radiation portion is passed along the second optical path and the first and second radiation portions each have a common predetermined band of wavelengths.

Claim 20

A respiratory and anesthetic gas analyzer, comprising: an elongate infrared radiation source, having a first longitudinal axis, for transmitting polychromatic infrared radiation including a wavelength band ranging from about 7 to about 10 micrometers; a radiation detector array for substantially simultaneously receiving said infrared radiation across the wavelength range from said radiation source, said array having a plurality of radiation sensitive elements that are aligned relative to a second axis; a polychromatic filter for filtering said infrared radiation from said radiation source, said filter including a plurality of filter portions having differing wavelength dependent radiation transmission characteristics, said filter being oriented such that each of said plurality of filter portions is optically associated with one of said plurality of radiation sensitive elements, the plurality of filter portions being aligned relative to a third axis; optical means for defining an optical path for imaging said infrared source onto and across said radiation detector array and said polychromatic filter such that said infrared source is imaged simultaneously on the plurality of radiation sensitive elements and the plurality of filter portions, wherein said wavelength band of infrared radiation from said source impinging on said detector array and said plurality of filter portions defines a polychromatic image of said source such that said first longitudinal axis of said source, when imaged on said detector array, is aligned with said second axis of said array and said third axis of said plurality of filter portions; and a gas sample chamber, wherein the detector array, polychromatic filter, and gas sample chamber are disposed on the optical path.

Claim 21

A respiratory and anesthetic gas analyzer, comprising: an elongate infrared radiation source, having a first longitudinal axis, for transmitting polychromatic infrared radiation including a wavelength band ranging from about 7 to about 10 micrometers; a radiation detector array for substantially simultaneously receiving said infrared radiation across the wavelength range from said radiation source, said array having a plurality of radiation sensitive elements that are aligned relative to a second axis; a polychromatic filter for filtering said infrared radiation from said radiation source, said filter including a plurality of filter portions having differing wavelength dependent radiation transmission characteristics, said filter being oriented such that each of said plurality of filter portions is optically associated with one of said plurality of radiation sensitive elements, the plurality of filter portions being aligned relative to a third axis; optical means for defining an optical path for imaging said infrared source onto and across said radiation detector array and said polychromatic filter such that said infrared source is imaged simultaneously on the plurality of radiation sensitive elements and the plurality of filter portions, wherein said wavelength band of infrared radiation from said source impinging on said detector array and said plurality of filter portions defines a polychromatic image of said source such that said first longitudinal axis of said source, when imaged on said detector array, is aligned with said second axis of said array and said third axis of said plurality of filter portions; and a gas sample chamber, wherein the detector array, polychromatic filter, and gas sample chamber are disposed on the optical path.

Claim 24

The method for analyzing gas of claim 19 wherein the step of emitting radiation further comprises: positioning a heating element and a substantially planar emitter plate in thermal contact to define said source; connecting the heater element to a power source; and operating the power source to heat the emitter plate at a temperature greater than 900° C.