52results about How to "Prevent false alarms" patented technology

The invention provides a fire early warning device for an aircraft engine. A redundancy voltage comparing and detecting technology, an outputting closed loop detecting technology and a crosslinking communication monitoring technology are used for detecting fire of the aircraft engine. The fire early warning device for the aircraft engine comprises an electrical bridge circuit, a logic control unit, a signal outputting circuit, a crosslinking outputting line and a crosslinking inputting line, wherein the electrical bridge circuit is provided with a thermal inductance resistance sensor; variations of resistance values of the thermal inductance resistance sensor are compared and judged by the logic control unit; fire warning and line faults can be detected in time; an outputting port is subjected to read-in comparison when equipment is electrified and runs; the outputting state is detected in real time so as to find out faults of a detecting box in time; and a crosslinking monitoring circuit monitors states of adjacent fire early warning devices in real time and transmits a device fault signal when the adjacent fire early warning devices fail.

A seismic-detection sensor device includes two accelerometers having different sensitivities. The seismic-detection sensor device provides excellent precision and operability monitoring.

Embodiments provide a method and apparatus for indicating aircraft height relative to an obstruction in a terrain awareness warning system. The method includes receiving data indicative of geographic features of an obstruction, lateral distance of the geographic features from an aircraft, height and flight path of the aircraft, calculating a projected height of the aircraft at the location of the obstruction using the data, generating a result signal, and displaying a colored indication on a display screen based on the result signal. The apparatus includes inputs for signals from instruments measuring height, flight path, and location of an aircraft, as well as an input for an instrument providing information about geographic features of terrain surrounding the aircraft.

The invention relates to an on-line timing method of mash gas sensor of safety monitoring system for mining, which includes three modes: 1) doing on site alignment calibration of mash gas sensor, that is controlling the mash gas sensor and sending the alignment calibration status messages to the monitoring branch station and the monitoring server out of mine; the monitoring server out of mine displays the mash gas sensor is in alignment calibration condition; then doing on site ventilation alignment calibration and service interruption functional test of the corresponding mash gas sensor, at last ending the alignment calibration condition; setting a mash gas sensor in a alignment calibration condition by the monitoring branch station, then doing on site ventilation alignment calibration and service interruption functional test of the corresponding mash gas sensor, at last ending the alignment calibration condition; setting a mash gas sensor in a alignment calibration condition by the monitoring server out of mine, then doing on site ventilation alignment calibration and service interruption functional test of the corresponding mash gas sensor, at last ending the alignment calibration condition. The invention can shorten the blind zone in monitoring time, in order to improve downhole operation safety and reduce mis-alarming.

The present invention relates to a device, system and method for determining at least one vital sign of a subject. The device (130) comprises an input interface (131) configured to obtain at least three detection signals (210) derived from detected electromagnetic radiation transmitted through or reflected from a skin region of a subject, wherein each detection signal comprises wavelength-dependent reflection or transmission information in a different wavelength channel, a vital sign extraction unit (132) configured to extract multiple candidate vital signs (232) of the same type of vital signfrom said at least three detection signals, wherein each candidate vital sign is extracted from a different detection signal or a different combination of at least two detection signals, a vital signdetermination unit (133) configured to determine a final vital sign (233) from said multiple candidate vital signs, and a reliability information unit (134) configured to provide reliability information (234a) indicating the reliability of said final vital sign and / or one or more of said candidate vital signs and to provide unreliability source information (234b) indicating the source of unreliability of said final vital sign and / or one or more of said candidate vital signs.