Fresnel lenses


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Fresnel lenses

(fră-nĕl)
[A. J. Fresnel, Fr. physicist 1788–1827]
A magnifying glass that distorts vision, preventing the eye from fixating. Under its influence spontaneous and gaze-specific nystagmus can be precisely evaluated.
References in periodicals archive ?
The emitter and the receiver are placed inside a box that provides shade; otherwise, the sunlight can burn the LEDs as well as the photodiodes as it becomes concentrated through the collimation ability of the Fresnel lenses. The use of a single Fresnel did not prove practical in the context of our trap.
The lens array in the proposed naked-eye 3D display usually consists of several circular Fresnel lenses or linear Fresnel lenses.
The concentric graduation that characterize Fresnel lenses can be particularly difficult to replicate.
The experts at IZM have also developed Fresnel lenses for these sensors.
Whitfield Solar, a UK company spun out of work at the University of Reading, is bringing a new concentrator that uses fresnel lenses to beam sunlight on to an area of photovoltaic material only one 40th the size of a conventional panel.
Since December 2007, in an attempt to reduce "side-swiping" - caused when motorists are travelling in the HGV's blind-spot, the Department for Transport has handed out more than 200,000 Fresnel lenses to foreign lorries entering the country.
Experiments were also performed with 15.24 cm diameter acrylic Fresnel lenses to determine the effect of lunar dust simulant on concentration performance.
In addition, the lights have up to 168 LEDs per lamp head, each focused on the entire light patch through specially designed Fresnel lenses, minimizing shadows.
The Government has begun to respond to the crisis with the distribution of 40,000 window-mounted lenses - known as Fresnel lenses - to left-hand drive trucks entering the UK from Dover.
The government has begun to respond to the crisis with the distribution of 40,000window-mounted lenses - known as Fresnel lenses - to left-hand drive trucks entering the UK from Dover.
"To try and reduce the number of these incidents on our roads, we worked with VOSA on a trial of fresnel lenses, which are placed on the passenger side window of the HGV, giving the driver a greater view of overtaking vehicles.