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- Do you require a useful relationship for modeling the sinewave modulation transfer function (MTF) of your imaging system?
Try: T(f)=exp[-(f/fc)n]
where T is the MTF, f is the spatial frequency, fc is the characteristic spatial frequency constant, and n is the MTF index. It works very well for most photoelectronic imaging systems, and it can simplify your MTF related studies. (Special graph paper is available from  that facilitates the process of finding fc and n.)
- To convert optical power (P, W) at a given wavelength (
 , m) to a photon rate (Np, photon/s) use Np = (5E24) P
- Need a convenient relationship to express the gain (G, e/e) of a
microchannel plate (MCP) electron multiplier as a function of applied potential (Vm, V)? Use G(Vm)=(Vm /Vc)g, where Vc is
the crossover potential of the MCP, and g is the gain index. For an MCP having channel length/diameter ratio of 40/1, typical values of the constants are Vc =350 V and g=8.5
- Do you have photon-counting-imaging, low-light-level imaging,
high-speed optical event detection, or unique optical sensor modeling/design/development/pre-production problems to solve?
- For more information from contact Bruce Johnson at cbj@phototube.com.
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