Ron Harris (footballer) his career. Between 1 April 2009 and 1 April 2010, Harris was attempting to set a new world record in signing the most autographs within a twelve-month period. This is being done via a UK-wide tour and via the sale of signed photos online. On 19 May 2011, he was given "Special Recognition Award" in a Chelsea player of the year ceremony. Ron Harris (footballer) Ronald Edward Harris (born 13 November 1944 in Hackney, London, England), known by the nickname "Chopper", is a former English footballer who played for Chelsea in the 1960s and 1970s. Harris is widely regarded as
Optical chopper asked questions on optical choppers. Optical chopper An optical chopper is a device which periodically interrupts a light beam. Three types are available: variable frequency rotating disc choppers, fixed frequency tuning fork choppers, and optical shutters. A rotating disc chopper was famously used in 1849 by Hippolyte Fizeau in the first non-astronomical measurement of the speed of light. Optical choppers, usually rotating disc mechanical shutters, are widely used in science labs in combination with lock-in amplifiers. The chopper is used to modulate the intensity of a light beam, and a lock-in amplifier is used to improve the signal-to-noise ratio. To