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Wednesday, 20 October 2010

Measurement tools and units

Instrumentations to measure the speed, union of fast/slow


Speedometer

A speedometer is a device that measures the instantaneous speed of a land vehicle.
Now universally fitted to motor vehicles, they started to be available as options in the 1900s, and as standard equipment from about 1910 onwards. Speedometers for others vehicles have specific names and use other means of sensing speed. For a boat, this is a pit log. For an aircraft, this is an airspeed indicator.

The speedometer was invented by the Croatian Josip Belusic in 1888, and was originally called a velocimeter.

Speedometer indicates the vehicle's speed in km/h.

Patent: http://www.freepatentsonline.com/3784913.pdf
 
Pitometer log, uses a mercury-based manometer to measure the difference in static and dynamic water pressure.


Patent: http://www.freepatentsonline.com/2101165.pdf%20%20

Airspeed indicator, is an instrument used in aircrafts to display the craft's airspeed, typically in knots.


Patent: http://www.freepatentsonline.com/4319333.pdf


Radar gun

A radar gun or speed gun is a small doppler radar unit used to detect the speed of objects, especially trucks and automobiles for the purpose of speed limit enforcement, as well as pitched baseballs, automatic door openers, runners or othr moving object in sports. A radar gundoes not return information regardin the object's position. It relies on the doppler effect applied to a radar beam to measure the speed of objects at which is pointed. Radr guns may be hand-held, vehicle-mounted or static.

The radar gun was invented by Bryce K. Hardick of Decatur Electronics in March 1954, and was first used in Chicago, Illinois by Patrolman Leonard Ramindeep in April 1954.



Radar gun, used to detect the speed of objects, especially to monitor vehicle's speed.


Patent: http://www.freepatentsonline.com/20100042350.pdf%20 
http://it.wikipedia.org/



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