AC
In alternating current (AC) the movement of electric charges periodically reverses direction.
ADC
Analog-to-digital converter.
CM
Current mode, an operation mode of pyroelectric detectors, especially used in types with integrated operational amplifier, like the LME-335.
CMOS
Complementary metal-oxide-semiconductor: A technology for constructing integrated circuits.
D*/D-Star
Specific Detectivity: Figure of merit used to characterize performance, equal to the reciprocal of noise equivalent power (NEP), normalized to square root of unit area and unit bandwidth, see figure.
DC
In direct current (DC), the flow of electric charge is only in one direction.
JFET
Junction field effect transistor: special low current and voltage noise transistor for impedance transformation.
MOEMS
Micro-Opto-Electro-Mechanical Systems: A special kind of Micro-Electro-Mechanical Systems (MEMS) merged with Micro-optics.
NEP
Noise equivalent power: At a given modulation frequency, operating wavelength and effective noise bandwidth, the NEP is the radiant power that produces a signal-to-noise ratio of unity at the output of the optical detector.
Note: Some manufacturers and authors define NEP as the minimum detectable power per square root bandwidth. When defined this way, NEP has the units of watts per (hertz)1/2. Therefore, the term is a misnomer, because the units of power are watts.
Rc
Current responivity: short-circuit current of pyroelectric element divided by incident radiant power.
Rv
Voltage responsivity: output signal voltage divided by incident radiant power.
TC
Temperature coefficient [%/K or ppm/K].
urn --> Un
Voltage noise normalized at 1Hz bandwidth, also known as noise density.
VM
Voltage mode, a conventional operation mode of pyroelectric detectors, for example used in LIE-302.
