Definitions for detectivity
de·tec·tiv·i·ty

WikipediaRate this definition:0.0 / 0 votes

1. detectivity

   Specific detectivity, or D*, for a photodetector is a figure of merit used to characterize performance, equal to the reciprocal of noise-equivalent power (NEP), normalized per square root of the sensor's area and frequency bandwidth (reciprocal of twice the integration time). Specific detectivity is given by D ∗ = A Δ f N E P {\displaystyle D^{*}={\frac {\sqrt {A\Delta f}}{NEP}}} , where A {\displaystyle A} is the area of the photosensitive region of the detector, Δ f {\displaystyle \Delta f} is the bandwidth, and NEP the noise equivalent power in units [W]. It is commonly expressed in Jones units ( c m ⋅ H z / W {\displaystyle cm\cdot {\sqrt {Hz}}/W} ) in honor of Robert Clark Jones who originally defined it.Given that noise-equivalent power can be expressed as a function of the responsivity R {\displaystyle {\mathfrak {R}}} (in units of A / W {\displaystyle A/W} or V / W {\displaystyle V/W} ) and the noise spectral density S n {\displaystyle S_{n}} (in units of A / H z 1 / 2 {\displaystyle A/Hz^{1/2}} or V / H z 1 / 2 {\displaystyle V/Hz^{1/2}} ) as N E P = S n R {\displaystyle NEP={\frac {S_{n}}{\mathfrak {R}}}} , it is common to see the specific detectivity expressed as D ∗ = R ⋅ A S n {\displaystyle D^{*}={\frac {{\mathfrak {R}}\cdot {\sqrt {A}}}{S_{n}}}} . It is often useful to express the specific detectivity in terms of relative noise levels present in the device. A common expression is given below. D ∗ = q λ η h c [ 4 k T R 0 A + 2 q 2 η Φ b ] − 1 / 2 {\displaystyle D^{*}={\frac {q\lambda \eta }{hc}}\left[{\frac {4kT}{R_{0}A}}+2q^{2}\eta \Phi _{b}\right]^{-1/2}} With q as the electronic charge, λ {\displaystyle \lambda } is the wavelength of interest, h is Planck's constant, c is the speed of light, k is Boltzmann's constant, T is the temperature of the detector, R 0 A {\displaystyle R_{0}A} is the zero-bias dynamic resistance area product (often measured experimentally, but also expressible in noise level assumptions), η {\displaystyle \eta } is the quantum efficiency of the device, and Φ b {\displaystyle \Phi _{b}} is the total flux of the source (often a blackbody) in photons/sec/cm².

How to pronounce detectivity?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say detectivity in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of detectivity in Chaldean Numerology is: 2

2. Pythagorean Numerology

   The numerical value of detectivity in Pythagorean Numerology is: 7

References

1. ^ Wikipedia
   https://en.wikipedia.org/wiki/Detectivity