Abstract: A capnometer (10) includes an integrated device (30, 30A, 30B) comprising a substrate (40), a lead selenide (PbSe) layer (42) or other infrared light absorbing layer disposed on the substrate, and a bandpass filter layer (50) disposed on the substrate. A temperature sensor tracks temperature of the device. A CO2 measurement cell (20) has light source (28) arranged to emit light (L) that passes through a flow path (F) and then through the bandpass filter layer of to reach the PbSe or other infrared light absorbing layer. Electronics (32) connected with the PbSe or other infrared light absorbing layer measure a photoconductivity signal. The electronics includes signal processing circuitry to convert the photoconductivity signal to a carbon dioxide partial pressure or concentration value. The electronics also includes the temperature sensor to enable accurate and fast temperature control of the device and instant temperature compensation for the temperature change.

Abstract: An improved infrared-based gas detector apparatus is described in which a substantial improvement in temperature measurement and tracking accuracy is achieved by combining a temperature sensing element such as a Thermistor to the body of a Lead Selenide (PbSe) plate detector. This allows for as close to possible measurement of the actual Lead Selenide film temperature without coming directly in physical contact with the film surface itself.

Abstract: A gas monitoring apparatus (10) identifies a target anesthetic or respiratory gas species and determines a concentration thereof. The gas monitor includes a multi-spectral mosaic filter and lens array (12), a composite thermal sensing focal plane array (26), and a signal processor (32). The mosaic filter and lens array (12) comprises a 2D array of lens structures (14) and long wave infrared (IR) band-pass filter elements (16) having a patterned thermally reflective metal disposition layer (18, 22) disposed on a first and/or second surface (20, 24) between adjacent lens structures and/or filter elements, respectively. The composite focal plane array (26) includes a plurality of individual thermal sensing focal plane arrays (28) with integrated read out integrated circuits (ROIC) that output a respective sensed channel data (36).

Abstract: A gas monitoring apparatus (10) identifies a target anesthetic or respiratory gas species and determines a concentration thereof. The gas monitor includes a multi-spectral mosaic filter and lens array (12), a composite thermal sensing focal plane array (26), and a signal processor (32). The mosaic filter and lens array (12) comprises a 2D array of lens structures (14) and long wave infrared (IR) band-pass filter elements (16) having a patterned thermally reflective metal disposition layer (18,22) disposed on a first and/or second surface (20,24) between adjacent lens structures and/or filter elements, respectively. The composite focal plane array (26) includes a plurality of individual thermal sensing focal plane arrays (28) with integrated read out integrated circuits (ROIC) that output a respective sensed channel data (36).

Abstract: An improved infrared-based gas detector apparatus is described in which a substantial improvement in temperature measurement and tracking accuracy is achieved by combining a temperature sensing element such as a Thermistor to the body of a Lead Selenide (PbSe) plate detector. This allows for as close to possible measurement of the actual Lead Selenide film temperature without coming directly in physical contact with the film surface itself.

Abstract: An infrared imaging device including a filter array (110) comprising: (i) a plurality of spaced filter elements (116); (ii) a reflective coating (114), wherein the reflective coating is disposed on the filter array between each of the plurality of spaced filter elements; and (iii) a plurality of lenses (112), wherein each one of the plurality of lenses is aligned with a respective one of the plurality of spaced filter elements and is configured to focus electromagnetic radiation into a beam; and an imaging sensor array (120) spaced by a first distance from the filter array and comprising a plurality of pixel elements (122), wherein each of the plurality of pixel elements is aligned with a focused beam from a respective one of the plurality of spaced filter elements.