lock-in amplifier

См. также в других словарях:

• Lock-in amplifier — A lock in amplifier (also known as a phase sensitive detector) is a type of amplifier that can extract a signal with a known carrier wave from extremely noisy environment (S/N ratio can be as low as 60 dB or even lessFact|date=December 2007). It… …   Wikipedia

• Lock-in Amplifier — Ein Lock in Verstärker (auch phasenempfindlicher Gleichrichter oder Trägerfrequenzverstärker (TFV) ) ist ein Verstärker zur Messung eines schwachen elektrischen Signals, das mit einem in Frequenz fref und Phase bekannten Referenzsignal moduliert… …   Deutsch Wikipedia

• lock-in amplifier — /lɒk ɪn ˈæmpləfaɪə/ (say lok in ampluhfuyuh) noun an amplifier which is sensitive to a very narrow band of frequencies; used to extract a faint signal from background noise …  

• Time-Domain Thermoreflectance — is a method by which the thermal properties of a material can be measured, most importantly thermal conductivity. This method can be applied most notably to thin film materials (up to hundreds of nanometers thick), which have properties that vary …   Wikipedia

• Scanning tunneling spectroscopy — (STS) is a powerful experimental technique in scanning tunneling microscopy (STM) that uses a scanning tunneling microscope (STM) to probe the local density of electronic states (LDOS) and band gap of surfaces and materials on surfaces at the… …   Wikipedia

• Phase-locked loop — PLL redirects here. For other uses, see PLL (disambiguation). A phase locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is related to the phase of an input reference signal. It is an electronic… …   Wikipedia

• Photothermal deflection spectroscopy — is a kind of spectroscopy that measures the change in refractive index due to laser heating of a surface. It works via the mirage effect where a refractive index gradient exists adjacent to the substrate s surface. The test laser beam is… …   Wikipedia

• Scitec Instruments — is a specialist manufacturer of test and measurement instruments for the laser and optics market. It also distributes lasers, optical instruments, optical components and fibreoptic products. The company was founded in 1981 and is privately… …   Wikipedia

• Photoelastic modulator — A photoelastic modulator (PEM) is an optical device used to modulate the polarization of a light source. The photoelastic effect is used to change the birefringence of the optical element in the photoelastic modulator. PEM was first invented by J …   Wikipedia

• Locked in — or lock in may refer to:*, a sleepover party in a public place *Lock in (pub), a term used to describe the owner of a pub allowing certain patrons to drink illegally past the official closing time *Lock in amplifier, a specialized type of… …   Wikipedia

• Optical power meter — in use 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 in fiber optic systems. Other general purpose light power measuring devices are usually… …   Wikipedia