The disclosure discloses a wide-concentration multi-component hazardous gas detector and an implementation method thereof, solving the problems of the existing technology that false negative results, ultra-limit concentration and sensor poisoning often occur in a gas detector used in fire fighting forces. The wide-concentration multi-component hazardous gas detector includes a gas diluting and sampling connector, a sensor integrated module, electrochemical sensors, ADC (analog to digital converter) circuits, MCU (microprogrammed control unit) single chip microcomputers, acousto-optic alarms, a 4-button keyboard module, an LED (light-emitting diode) display module, an SD card data memory module, a power supply control and electric quantity display module, a high-performance lithium battery pack, a small evacuation pump, 433M signal transmission modules and a remote command platform signal collection terminal.

A system for testing alcohol breath analyzers, wherein the system comprises an alcohol breath gas generation device, a test chamber, a reference measuring device, a control and registration unit, and a distribution unit. The invention also relates to methods of testing alcohol breath analyzers.

In order to prevent cracking of a window material in manufacturing an optical measurement cell that satisfies various performances required for airtightness, heat resistance, and the like by atomic diffusion bonding, an optical measurement cell into which a sample is introduced includes a light transmission window through which light is transmitted, and includes a window material forming the light transmission window, and a flange member to which the window material is bonded via a metal thin film, and a ratio of a thermal expansion coefficient of the flange member to a thermal expansion coefficient of the window material is 0.5 times or more and 1.5 times or less.

A method of operating a gas sensing device is described. The method includes receiving a signal indicative of a value of resistance of a gas sensing element, processing the signal received to compute a value of a gas concentration, performing a comparison of the value of gas concentration to a threshold, and, based on the outcome of a diagnosis procedure, setting the device to an alert signal issue state as a function of the outcome of the comparison. The diagnosis procedure includes computing a set of parameters indicative of the state of the gas sensor circuit, and classifying the gas sensor circuit in one of a first, a second and a third class based on the parameters.

The method for calculating concentration ratio includes: (a) heating a gas sensor element to a temperature at which both of two gas components introduced in a gas sensor element react, and maintaining the temperature for a predetermined period to measure an electrical resistance value of the gas sensor element; (b) heating the gas sensor element to a temperature at which only any of the two gas components reacts, and maintaining the temperature for a predetermined period to measure an electrical resistance value of the gas sensor element; and (c) calculating a concentration ratio of the two gas components based on a combination of the electrical resistance value in (a) and the electrical resistance value in (b).

A method of operating a sensor system including at least one sensor to detect a first gas analyte and a control system includes electronically interrogating the sensor to determine the operational status thereof and, based upon the results of the electronic interrogation, the control system initiating an automated maintenance procedure for the sensor.

An in-flight safety enhancing system including: a combined automatic dependent surveillance broadcast (ADS-B) and carbon monoxide (CO) detecting device configured to receive an ADS-B transmission and obtain a CO reading; and a flight application executing on an aircraft crew computing device separate from the combined ADS-B and CO detecting device, and configured to: receive the ADS-B transmission and the CO reading; augment the flight application with information extracted from the ADS-B transmission; and provide a CO status notification when the CO reading exceeds a CO threshold value.

The disclosed technology is generally directed to an audit ledger for externality tracking. In one example of the technology, auditing of a virtual sensor is enabled. The virtual sensor is configured to output an externality value based on received telemetry data. The externality values are associated with the at least one particular type of quantifiable technical externality. Signing of the virtual sensor is enabled. Audit information associated with the signing of the virtual sensor is stored on a ledger. Periodic aggregated externality values based on the externality values output by the virtual sensor are calculated. The periodic aggregated externality values are stored on a distributed ledger. An audit of the periodic aggregated externality values is enabled. The auditing of the periodic aggregated externality values includes verifying the signing of the virtual sensor by the auditor based on the stored audit information.

A system and method for ascertaining the concentration of a preselected target substance, characterized by a mitigated tendency for yielding results distorted by a departure from a state of calibration, i.e., by “drift”, which drift is ordinarily caused by temperature and humidity variations; drift-mitigation is achieved by exposure of a target substance to a metal oxide semiconductor material, the temperature of a heating element operatively associated with said material being cycled between a low-temperature interval and a high-temperature interval, in which latter interval the material's temperature is raised to a level at or above the minimum temperature for rapid formation of one or more oxides of the target substance, the oxide formation taking place in a sufficiently short time that the conductivity is reflective of a transient signal amplitude in a brief interval of time, such that the external factors causing drift do not have sufficient opportunity to distort the concentration determination.

Methods and systems for detecting membrane blockage in a gas detector are disclosed. In some embodiments, the gas detector comprises a membrane configured to define a sensing chamber of the gas detector. The gas detector further comprises a strain sensor operatively connected to the membrane, the strain sensor configured for generating output signals related to strain in the membrane. The gas detector comprises a controller operatively connected to the strain sensor. The controller is configured to: determine a strain in the membrane based on the output signals; and determine a condition of the membrane based on the determined strain, wherein the determined condition indicates whether the membrane is blocked.