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Smoke detectors are devices that detect smoke. They are used as warning devices in houses to warn people of fire.
Smoke detectors
carbon monoxide detectors used for detecing carbon monoxide that is a odorless deadly gas that can come into your home and hurt your family. they detect it and warn you
Scintillation detectors have been used to detect gamma rays aboard many space missions. They have been used to observe sources of cosmic gamma rays.
there are traces of iron in the bone so the metal detecters can detect them :-)
you would use a weather satellite or doppler radar.
It is used to detect very small DC currents only. For AC signals Detectors are used.
Speed detectors also known as radar guns are used by law enforcement to detect the speed at which a person is traveling. The officer points the radar gun at a moving vehicle and can tell whether the person is speeding or not.
Cobra radar detectors are devices used to detect if the police are monitoring your car or checking your speed limit using a radar gun. This is used by motorist so they can fix their speed before getting pulled over.
Gasntools Gas detectors can be used to detect combustible, flammable and toxic gases, and oxygen depletion. This type of device is used widely in industry and can be found in locations, such as on oil rigs, to monitor manufacturing processes and emerging technologies such as photovoltaic.
There are artificial detectors (photo receptors) that can sense light. They're commonly used in security applications.
Radar detectors that read digital signal processing (DSP) and can be programed to intercept Ka (low) frequency transmission are what you want. Beltronics manufactures several models, as does Whistler.