Light intensity measurement for holograms

Rodger · Post by **Rodger** » Thu Dec 11, 2003 7:25 am

I am interested in obtaining additional information on constructing a light intensity measuring device using a photodiode, as discussed in your 'Exposure' topic. Can I get additional specific information or can you provide a reference?

Sergey Vorobyov · Post by **Sergey Vorobyov** » Sun Dec 14, 2003 7:41 pm

You can ask me about measurement of intensity of laser beams. I know about it a little.

oquagen · Post by **oquagen** » Wed Dec 17, 2003 3:21 am

Please describe, which specific details of intensity measuring device you are interested in? We could provide information about it.

Rodger · Post by **Rodger** » Sat Dec 27, 2003 12:50 am

My son is using holography for a school science project. I would like to construct a light meter using a photodiode that can measure the light intensity. Your article mentions the FD-7K photodiode. I would like to find a similar diode available in USA that would work. Also would like to add an amplifier circuit to boost the output so we could use a milli-amp meter to meaure the output. Thanks

Sergey Vorobyov · Post by **Sergey Vorobyov** » Thu Jan 08, 2004 11:45 pm

Sorry, I don't found information about photodiodes in USA. I propose for you use silicon solar element for measurement the illumination of hologram. The solar element use for power supply of portable radio receiver, etc. Take a black paper with an aperture diameter 3 mm and close solar element. Take multimeter and measurement current from solar element, when you put it on place of photoplate. If you use silicon solar element you can calculate the time of record, as write in chapter "Technology" in our site.
Main problem of this method – linearity of measurement. Take piece of processed photoplate (processed in GP-2 or GP-3 developer, it transparent and have the weak - brown color) and put on aperture on solar element. The photocurrent must be reduce near 2,5 time! If the photocurrent has changed on other value, it means, the measurement nonlinearity. Need add one or two piece of photoplate on aperture (reduce light intensity) and repeat check of linearity.

Syazrail · Post by **Syazrail** » Wed Aug 10, 2005 6:34 am

I'm designing a light intensity measurement using phototransistor SFH309FA. I need help here.

d · Post by d » Fri Sep 09, 2005 9:12 pm

quote:Originally posted by Rodger:
My son is using holography for a school science project. I would like to construct a light meter using a photodiode that can measure the light intensity. Your article mentions the FD-7K photodiode. I would like to find a similar diode available in USA that would work. Also would like to add an amplifier circuit to boost the output so we could use a milli-amp meter to meaure the output. Thanks