It's an optical illusion.

There's a motion sensor in the corner.

The sensor is just a little strip of metal in that headband there.

An example is a sensor having a switch approximately 1.5 nanometers across, capable of counting specific molecules in a chemical sample.

The Universal Media Disc (UMD) is an optical disc medium developed by Sony for use on their PlayStation Portable handheld gaming and multimedia platform.

Underneath my heel, there is a sensor that detects when my foot leaves the ground what's called the heel lift.

For example, the same Willard Boyle developed a small light sensor in 1969, during his work in optics.

In the first case, sound waves are emitted from the camera, and by measuring the delay in their reflection, distance to the subject is calculated.

Fiber Distributed Data Interface (FDDI) is a standard for data transmission in a local area network.

And we'll place an acoustic tag that says, OMSHARK 10165, or something like that, acoustically with a ping.

It is the only handheld console to use an optical disc format, Universal Media Disc (UMD), as its primary storage medium.

Atomic dimensions are thousands of times smaller than the wavelengths of light (400 700 nm) so they cannot be viewed using an optical microscope.

Again, this is not an optical trick. This is what you would see. In other words, it's not a camera cut. It's a perceptual trick.

And if you walk faster, if I walk faster, it detects what's called the time interval, which is the interval between each heel lift.

Under a different load, it's a different structure. And you can actually exploit that by putting in a very small number of conducting fibers to actually make it a sensor.

Signals transmitted over consumer grade TOSLINK connections are identical in content to those transmitted over coaxial S PDIF connectors, though TOSLINK S PDIF commonly exhibits higher jitter.

Yossi Vardi This is one of the most popular viral advertisement of last year, known as the optical inch by Philips. Let's applaud Philips for this gesture for humanity.

The method combines amplification with a novel technology called Surround Optical Fiber Immunoassay (SOFIA) and some specific antibodies against PrPSc.

In 1680, Dutch naturalist Anton van Leeuwenhoek first microscopically observed yeast, but at the time did not consider them to be living organisms, but rather globular structures.

This sensor, although this was not at all the original intention, now serves as an eye to all digital cameras worldwide, and earned him the Nobel physics prize in 2009.

It uses optical fiber as its standard underlying physical medium, although it was also later specified to use copper cable, in which case it may be called CDDI (Copper Distributed Data Interface), standardized as TP PMD (Twisted Pair Physical Medium Dependent), also referred to as TP DDI (Twisted Pair Distributed Data Interface).

And then with a lot of effort, after tagging, putting in the computer, making sure the stalk is sticking out so it senses the environment, we send this fish back into the sea.

It's a color sensor that detects the color frequency in front of me and sends this frequency to a chip installed at the back of my head, and I hear the color in front of me through the bone, through bone conduction.

In December 2011, exactly two years after Abbott started feeling unwell, a probe, equipped with a camera, was fed into the cavity between the lining of his chest and the lining of his lung.