Abstract: A respiration gas monitor device (100) includes a pump (110) connected to draw a flow of respired air, a pressure sensor (150, 160) is connected to measure an air pressure signal responsive to the flow of respired air, and a pressure transducer (180c). Electrical circuitry (170, 180) is operatively connected to measure flow across the pressure sensor. A gas component sensor (190, 192, 194) is arranged to monitor a target gas in the flow of respired air.

Abstract: A respiration gas monitor (RGM) device includes an infrared light source (30) launching infrared light (34) through a respired air flow path (36), and an optical detector (40) that detects the infrared light after passing through the respired air flow path. An absorption line bandpass filter (42) has a passband encompassing an absorption line of a target gas. A reference line bandpass filter (44) has a passband over which the respired air is transparent. A control device (62, 64, 70, 80, 90) switches the RGM device between: a monitoring state in which the absorption line bandpass filter is in the path of the infrared light; and a calibration state in which the reference line bandpass filter is in the path of the infrared light and the absorption line bandpass filter is not in the path of the infrared light.

Abstract: A target gas sensor employing a radiation source (20) and a radiation sensor (30) including a reference radiation detector (31), a target radiation detector (32), a temperature sensor (34), a temperature controller (35) and a target gas detection processor (37). In operation, radiation source (20) controls a propagation of radiation (RAD) through a gas mixture (GM) contained by an airway (10) to radiation sensor (30). Reference radiation detector (31) generates a reference detection signal (RD) indicative of a detected magnitude of a reference wavelength (?REF) of the radiation, and target radiation detector (32) generates a target detection signal (TD) indicative of a detected magnitude of a target wavelength (?TG) of the radiation. Temperature sensor (34) senses a temperature of radiation detectors (31, 32) whereby temperature controller (35) regulates a heating of the radiation detectors (31, 32) relative to a regulated detector temperature (TREG).

Abstract: A target gas sensor employing a radiation source (20) and a radiation sensor (30) including a reference radiation detector (31), a target radiation detector (32), a temperature sensor (34), a temperature controller (35) and a target gas detection processor (37). In operation, radiation source (20) controls a propagation of radiation (RAD) through a gas mixture (GM) contained by an airway (10) to radiation sensor (30). Reference radiation detector (31) generates a reference detection signal (RD) indicative of a detected magnitude of a reference wavelength (?REF) of the radiation, and target radiation detector (32) generates a target detection signal (TD) indicative of a detected magnitude of a target wavelength (?TG) of the radiation. Temperature sensor (34) senses a temperature of radiation detectors (31, 32) whereby temperature controller (35) regulates a heating of the radiation detectors (31, 32) relative to a regulated detector temperature (TREG).

Abstract: A sensor device to detect a level of carbon dioxide in a body of gas includes one or more lead selenide detectors as infrared sensing elements. The sensor device operates without temperature regulation required by conventional lead selenide-based sensors, and instead measurements of the sensor device are compensated for a temperature measured by a thermal sensor.

Abstract: A sensor device is configured to detect a level of carbon dioxide in a body of gas. The sensor device employs one or more lead selenide (PbSe) detectors as infrared sensing elements, and operates without the temperature regulation required by conventional PbSe-based sensors. Instead, measurements of detector device are compensated for a temperature measured by a relatively inexpensive thermal sensor. This may reduce the cost, enhance stability, enhance ruggedness, enhance manufacture and/or provide other advantages over conventional detectors.

Abstract: An addressable valve system is described wherein a plurality of valves are embedded into a single, compact valve block. Each valve comprises a piston moving in a bore in the block. A magnet embedded in the piston is positioned within a coil. When energized, the coil attracts the magnet and the plunger upwards away from a valve seat. Magnetic shields disposed between the pistons provide magnetic isolation between the pistons and simultaneously apply a closing force to the pistons by drawing the magnets downward towards the valve seat. When energized, the coils overwhelm the closing force and open the valves. Electronics for the valve block and the coils are provided on a circuit board overlying the pistons and bores. The electronics provide addressability of the valves and automatically generate “pick” and “hold” timing whereby the initial motivating force (voltage) applied to the current is higher to get the valves moving quickly when valve is first commanded to open.