Variable sheet:
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St Input Name Output Unit Comment
300 lambda nm wavelength of light (cm, , ľm, nm)
freq 9.9933E14 Hz frequency (Hz)
E 6.622E-19 Joule energy (Joule, erg, eV, kcal/mole)
v 33333.333 cm-1 wavenumber (cm-1)
20 T C Temperature (K, C)
4 g gain per stage
L V 819.76032 volts total voltage applied
Vd 91.08448 volts voltage per dynode (volts, KV)
9 k number of dynodes
m 262144 multiplication factor
rt 100.01079 sec-1 cathode thermionic emission rate (sec-
1 eta collection efficiency
.2 Klam Quantum efficiency
Rlam .04838649 amps/watt radiant cathode responsivity (amps/wat
Flux 151.01902 sec-1 Photon flux on cathode (sec-1)
1E-16 Phi watts Radiant flux on cathode (watts, mwatts
rcp 30.203803 sec-1 rate at which electrons emitted from c
ic 4.839E-18 amps cathode photocurrent (amps, mA, ľA, nA
ia 1.2684E-9 mA anode photocurrent (amps, mA, ľA, nA,
ict 1.602E-17 amps cathode thermionic current (amps, mA,
4.2E-12 iat amps anode thermionic current (amps, mA, ľA
Es .01268423 volts signal voltage (volts, mvolts)
1E10 RL ohms load (or feedback) resistance (ohms, K
sigmai 2.665E-13 amps signal shot noise current (amps, mA, ľ
alpha .33333333 secondary emission factor
sigmat 4.849E-13 amps thermionic shot noise current (amps, m
0 excess amps excess noise current (amps, mA, ľA, nA
sigmad 4.849E-13 amps total dark noise current (amps, mA, ľA
sigma 5.534E-13 amps total shot noise current (amps, mA, ľA
sigmav .00553352 volts total shot noise voltage (volts, mvolt
sigmaJ 8.9927E-6 volts Johnson noise voltage (volts, mvolts)
.0001 flicfac flicker factor
sigmaf 1.2684E-6 volts flicker noise voltage (volts, mvolts)
sigman 5.5335293 mvolts total noise voltage (volts, mvolts)
L SNR 2.2922493 signal-to-noise ratio
1 t sec integration time (sec)
tau .5 sec RC time constant (sec)
resptim 2.5 sec RC response time (sec)
deltaf .5 Hz noise bandwidth, Hz
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Rule sheet.
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sigmaf=flicfac*Es* lambda = 1/v
* E = (6.6261E-34)*freq
* freq = (2.998E10)/lambda
* m=g^k
* Vd=V/k
* g=0.17*Vd^.7 " this is partly empirical
* rcp=Klam*Flux
* Rlam=(Klam*1.602e-19)/E
* ia=eta*m*Rlam*Phi
* ic=rcp*1.602e-19
* Flux=Phi/E
* ict=rt*1.602e-19
* iat=m*eta*ict
* Es=RL*ia
* sigmai=sqrt(2*1.602e-19*(1+alpha)*m*ia*deltaf)
* alpha=1/(g-1)
* sigmat=sqrt(2*1.602e-19*(1+alpha)*m*iat*deltaf)
* sigmad=sqrt(sigmat^2+excess^2)
* sigma=sqrt(sigmad^2+sigmai^2)
* sigmaJ=sqrt(4*1.38e-23*T*RL*deltaf)
* sigman=sqrt((RL*sigma)^2+sigmaJ^2+sigmaf^2)
* sigmav=RL*sigma
* SNR=Es/sigman
* deltaf=1/(2*t)
* deltaf=1/(4*tau)
* resptime=5*tau
* sigmaf=flicfac*Es
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Download the Photomultiplier SNR model.
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