| 摘要 |
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 (λREF) of the radiation, and target radiation detector (32) generates a target detection signal (TD) indicative of a detected magnitude of a target wavelength (λTG) 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). Target gas detection processor (37) measures the target gas concentration within the sample of the gas mixture (GM) as a function of an absorbing spectral response ratio (SRRA) and a temperature compensation (TPC). |
| 主权项 |
1. A target gas sensor for measuring a target concentration within a sample of a gas mixture contained by an airway, the target gas sensor comprising:
a radiation source and a radiation sensor operable in optical communication with the airway to propagate radiation (RAD) from the radiation source through the gas mixture (GM) contained by the airway to the radiation sensor; and wherein the radiation sensor includes
a reference radiation detector operable to generate a reference detection signal (RD) indicative of a magnitude of a detection signal of the reference radiation detector at a reference wavelength (λREF) of the radiation (RAD),a target radiation detector operable to generate a target detection signal (TD) indicative of a magnitude of a detection signal of the target radiation detector at a target wavelength (λTG) of the radiation (RAD),a temperature sensor in thermal communication with the reference radiation detector and the target radiation detector to generate a detector temperature signal (DT) indicative of a temperature of the reference radiation detector and the target radiation detector,a temperature controller operable in signal communication with the temperature sensor to regulate a heating of the reference radiation detector and the target radiation detector relative to a regulated detector temperature (λREF), wherein the reference radiation detector and the target radiation detector are maintained at the regulated detector temperature (TREG) by heating alone when the ambient temperature lies within a suitable range, anda target gas detection processor operable in signal communication with the reference radiation detector, the target radiation detector and the temperature sensor to measure the target gas concentration within the sample of the gas mixture (GM) as a function of an absorbing spectral response ratio (SRRA) and a temperature compensation factor (TPC), wherein a spectral response ratio is a ratio of a target detector signal to a reference detector signal,wherein, in a presence of an absorbing gas mixture contained by airway, the absorbing spectral response ratio (SRRA) represents a comparison of the target detection signal (TDA) relative to the reference detection signal (RDA) at an unregulated detector temperature exceeding the regulated detector temperature (TREG), andwherein, in a presence of a non-absorbing gas mixture contained by airway, the temperature compensation factor (TPC), which is a predetermined function of temperature representing a calibration of a non-absorbing spectral response ratio (SRRNU) representative of a comparison of the target detection signal (TDNU) relative to the reference detection signal (RDNU) at the unregulated detector temperature to a regulated spectral response ratio (SRRNR) representative of a comparison of the target detection signal (TDNR) relative to the reference detection signal (RDNR) at the regulated detector temperature (TREG) determined in the presence of a non-absorbing gas. |
