Seismic Sensor

Seismic Sensor

 

an instrument used in seismic exploration and designed to pick up mechanical oscillations of the ground and convert them into electrical oscillations. Inertial sensors are used for work on land. A common type is an electro-dynamic sensor with natural frequencies of 0.5–40 Hz and with aperiodic critical damping. There are vertical and horizontal seismic sensors. Vertical sensors, which primarily record compressional waves (P waves) arriving from below, are used most often. Horizontal types are used to record shear waves (S waves). A three-component sensor consisting of a vertical sensor and two horizontal sensors in a single housing is used to study the total vector of ground displacement.

Ceramic piezoelectric pressure sensors are used at sea. They become electrically polarized when an elastic wave causes a change in the external pressure applied to the sensor. Such sensors are placed inside a special hose, which is towed by a ship. Hermetically sealed, electrodynamic sensors are usually used for integrated seismic well logging. They are equipped with electronic amplifiers for preliminary amplification of the weak electrical oscillations transmitted by cable up from the well.

I. I. GURVICH

References in periodicals archive ?
The research team utilized a seismic sensor network on the western portion of Greenland's ice sheet that previously had been used to track glaciers and earthquakes, but never the ice sheet itself.
Thuraya's range of third-party certified LDR M2M solutions currently includes SMC's mobile asset tracking; Seven Technologies' remote link for fixed M2M applications; the Ibexis telemetry data logger; and Digital Barriers' seismic sensor mesh network.
The tested seismic sensor S-5-SR was installed in the basement floor of large building.
Hundreds of seismic and air-sniffing sensors have been placed all over the world, and countries have done a better job of sharing their legacy seismic sensor data with those who monitor the treaty, he said.
An expendable unattended ground sensor is a seismic sensor system capable of detecting footstep and vehicle traffic in remote locations.
However, as said in our introduction, there is no panacea, and a seismic sensor designed to detect the arrival of a tank at long range will not be suitable to pick the approach of a man on foot.
These include a seismic sensor to detect heartbeats within lorries and an electronic recording and facial-recognition system to spot forged documents.
Experience on land with Global Seismic Network stations indicates that the best results are obtained by placing the seismic sensor in a borehole at about 100 meters depth.
A typical seismic sensor consists of a set of coils and magnets called "geo-phones.
Omron Creative Labs of Omron Electronic Components LLC and Itron Idea Labs will be teaming up to demonstrate the Omron D7S Seismic Sensor and Itron Riva Development Kit to detect and evaluate seismic activity at Sensors Expo and Conference in San Jose, June 27-29.
William Steinway, executive vice president of CyTerra, said that incorporating the seismic sensor as a third active system should increase the detector's ability to locate mines and reduce false alarms.
The seismic sensor was installed on Barro Colorado Island as installed in 2006 as part of a $37.