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All Fiber Doppler Velocity
Interferometer Systems
a new kind of VISAR


Series G Unamplified
Single Photodetectors
for light levels
for light levels
of 0.1 mW and higher


Series F Amplified
Single Photodetectors
for light levels down to nanowatts


Series F Amplified
Dual Differential Photodetectors
like Series F single detectors,
but only the difference is amplified


Power Supply
recommended
for DC coupled PDMs
and all Differentials


International Order Policies

 
Martin, Froeschner & Associates Power Supply

Power Considerations

The Series G unamplified modules have very low current drain and the small internal batteries should last for a year or so of normal use.

In the amplified Series F modules the power drain is substantial and internal replaceable battery life would be very short. For these amplified modules the power cord configuration and an external power supply is recommended. Although any high quality controllable laboratory style power supply can be used, we recommend our own, especially for DC coupled modules, multi-stage high gain modules and differential models. Bear in mind that any power supply is a potential source of noise and interference.

The amplifiers in the Series F Modules require 12 volts. The current draw is 40 mA for each Mod 1 or Mod 2 stage and 12 mA for each Mod 4 stage. Thus a Mod 1A requires 40 mA, a Mod 1D requires 80 mA as there is an additional reference amplifier, a Mod 42A needs 52 mA and so on.

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M, F & A Power Supply

The M, F & A External Power Supply provides noise free power to the photodiode(s) and amplifier(s) from gel-cell batteries which are about the most noise-free source there is. The batteries are charged by an internal charging unit when the photodetector module is not in use or extraneous noise is not an issue. When the photodetector module is in active use, the system can be completely disconnected from the charging circuit and external AC source. Power is provided to the module through a shielded cable with a connector that mates the module to the power supply. The unit provides all the sources required for any M, F & A Photodetector module including AC coupled, DC coupled with Offset Null, single and differential modules. Larger versions capable of powering multiple Series F Photodetector Modules are also available.

External Power Supply for Single Detector
12volt rechargeable gel-cell with EMI/RFI shielding (price: $275)

Multiple Output version, powers up to 4 modules (price: please inquire)

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Martin, Froeschner & Associates
14300 Mines Road, Livermore, California, 94550
USA

tel: (+1) 925 989 4930
fax: (+1) 925 449 4647
email: sales@mfaoptics.com

 

  © 2010
Updated: June 2010

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email: sales@mfaoptics.com

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