matal detectors are usually used but digging helps too!
CEIA Spa makes metal detection used by Governments, etc. CEIA Spa makes metal detection used by Governments, etc.
Like the first person said, bismuth.
There are both active and passive sensors that are used in water leak detection. Passive systems sound an alarm usually involving sound to alert one to fix the leak. An active system is similar in it's alerting system but it also takes some automated actions to try and fix the leak.
strontium........happy to help =D
Used for error detection
Mainly inertia switches are used to detect the accident and cut off the fuel pump. I think separate sensor is used for operating air bag in the vehicles
Based on the information available, the majority of automated furniture uses an ultrasonic sensor. These sensors work by producing a high frequency sound. Options include through-beam, direct detection, and retro-reflective.
Minelab produces Metal Detection equipment. Minelab is the world leader in metal detection equipment for consumers, demining needs and military needs.
The simplest detection of a magnetic field is done by another magnet. Or by an apparatus such as a Fluxgate magnetometer or similar.
Sensors that primarily operate in the electromagnetic spectrum just below the range of visible light include infrared (IR) sensors. These sensors detect and measure infrared radiation, which has longer wavelengths than visible light. They are commonly used in applications such as night vision devices, remote temperature sensing, and proximity detection.
A dead zone in a sensor is the point where a sensor will not work. Ultrasonc sensors and specific optical sensors for example have measurement or detection ranges quoted as 30mm-300mm sensing. This means the sensor will not operate from 1-29mm or over 300mm.
type of sensors used in aeroplanes