Yes it is, a PIR stands for Passive InfraRed, which detects heat signatures. For a higher level of security, I would recommend dual band motion detectors with PIR and Microwave Detection capability.
ASDIC
In 1915, Paul Langévin invented the first sonar type device for detecting submarines called an "echo location to detect submarines" using the piezoelectric properties of the quartz.
Radiation energetic enough to ionize matter with which it collides is called Ionizing Radiation. The Geiger counter is a radiation detection device that makes use of ionizing radiation in its operation. This device is also used to measure the amount of radiation.
This device is called a joystick. It was a very common gaming device in the early days of video games and computers, but has largely been replaced by other kinds of controllers.
A bridge is a common measuring device in a metrology lab, or a standards lab. They are very sensitive and are used to compare or measure items with great accuracy.
A Passive InfraRed Sensor (PIR)
It's called a "Motion Detector"!
radar
e-nose
ASDIC
None. The megapixels are in the detecting device. e.g. a camera, a CCD device.
The Piranah Water 3000
Alexander Popov was one of the first to create a radar device. His device, created in 1895, was meant for detecting lightning strikes.
A microphone detects sounds transmitted in the air.
the cloud chamber the cloud chamber
In order to enter the individual courtrooms in a court house, one must go through a metal detecting device as well as all of their belongings. This is to insure that no weapons of any kind can be brought in.
The Security device manager is stored in the Router's Flash Memory