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An optical variable device or optically variable device (OVD) is an iridescent or non-iridescent security feature that exhibits different information,...

optical attenuator, or fiber optic attenuator, is a device used to reduce the power level of an optical signal, either in free space or in an optical...

A diffractive optically variable image device (DOVID) is a type of optical variable device; a security feature based on visual effects created by diffraction...

An optical chopper is a device which periodically interrupts a light beam. Three types are available: variable frequency rotating disc choppers, fixed...

Application-specific devices, such as synthetic-aperture radar (SAR) and optical correlators, have been designed to use the principles of optical computing. Correlators...

respectively). This is also the only note for the series that uses optically variable ink. The banknote was designed by Romeo Mananquil. After the creation...

optical line termination (OLT), also called an optical line terminal, is a device which serves as the service provider endpoint of a passive optical network...

piezoelectric device to generate full audio Buzzer – Electromagnetic or piezoelectric sounder to generate tones Position, motion Linear variable differential...

A telescopic sight, commonly called a scope informally, is an optical sighting device based on a refracting telescope. It is equipped with some form of...

Optical Variable Device, an iridescent image that exhibits various optical effects such as movement or color changes Ophthalmic viscosurgical device,...

A passive optical network (PON) is a fiber-optic telecommunications network that uses only unpowered devices to carry signals, as opposed to electronic...

anniversary of its Liberation. One feature from the note is an optically variable device (OVD) patch that shows a fingerprint, a reference to the victims...

spectrum. Below optical frequencies (that is, at microwave and radio frequencies), the spectrum analyzer is a closely related electronic device. Spectrometers...

beamsplitter is an optical device that splits a beam of light into a transmitted and a reflected beam. It is a crucial part of many optical experimental and...

An optical fiber, or optical fibre, is a flexible glass or plastic fiber that can transmit light from one end to the other. Such fibers find wide usage...

employs various electronic, magnetic, optical, or mechanical changes to the disk's surface layer. A disk drive is a device implementing such a storage mechanism...

An optical power meter (OPM) is a device used to measure the power in an optical signal. The term usually refers to a device for testing average power...

Optical sound is a means of storing sound recordings on transparent film. Originally developed for military purposes, the technology first saw widespread...

analysis) or using variable incidence angles. For samples that can be prepared in thin slices, higher precision is obtainable using optical transmission experiments...

These notes contained a transparent "window" with a diffractive optically variable device (DOVD) image of Captain James Cook as a security feature. Australian...