Frequently used abbreviations of sensor technologies in the range of electronics

Frequently used electronical abbreviations are listed here. This chapter includes explanations of electronical components of pyroelectric detectors. The section also includes specifications of different operating modes of pyroelectric detectors.

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.

OpAmp

Operational amplifier.

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.

SNR

Signal-to-noise-ratio.

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.

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