new idea
I figured screw the reflector and the condenser.........I'll bet they don't help that much anyway!
I figured screw the reflector and the condenser.........I'll bet they don't help that much anyway!
Re: light recycling solution?
I don't want to be sceptic, but where are you going to find the 1/4 wave retarder sheet and other stuff mentioned in your scheme?
The theory sounds good, but in the means of overall setup cost I suppose it's cheaper to buy the more powerful bulb to gain those 40% of additional lumens and one or two additional fans to cool down the LCD.
proto5 said:
I don't want to be sceptic, but where are you going to find the 1/4 wave retarder sheet and other stuff mentioned in your scheme?
The theory sounds good, but in the means of overall setup cost I suppose it's cheaper to buy the more powerful bulb to gain those 40% of additional lumens and one or two additional fans to cool down the LCD.
parts
I already have several sources for the parts. I already have the 575watt metal halide w 15" panel setup. We are trying to stretch the envelope here......brighter....smaller...cooler....sharper...etc..
I already have several sources for the parts. I already have the 575watt metal halide w 15" panel setup. We are trying to stretch the envelope here......brighter....smaller...cooler....sharper...etc..
Proto5,
You have seriously been doing homework. Good job I might ad.
It looks like 3M makes some thin plastic 1/4 wave retarder sheets .010 thick. They are available in 19" x 26" size (I think that was the size)
I may have mistakenly mislabeled my recycler design as I believe you are right about the 1/4 wave retarder. It takes a 1/2 wave retarder to rotate P to S or S to P the quarter wave rotates these to the circular polarization states.
Hezz
You have seriously been doing homework. Good job I might ad.
It looks like 3M makes some thin plastic 1/4 wave retarder sheets .010 thick. They are available in 19" x 26" size (I think that was the size)
I may have mistakenly mislabeled my recycler design as I believe you are right about the 1/4 wave retarder. It takes a 1/2 wave retarder to rotate P to S or S to P the quarter wave rotates these to the circular polarization states.
Hezz
Re: Re: light recycling solution?
well, the idea was actually not to use any cooling fan or more brighter heat generating light bulbs... for the sole reason of heat dissipation and quieter machine. And, in the long run, this would prove more cost effective.
afan said:
well, the idea was actually not to use any cooling fan or more brighter heat generating light bulbs... for the sole reason of heat dissipation and quieter machine. And, in the long run, this would prove more cost effective.
Impossible / Film supplier
Some of the recycling schemes proposed are impossible as they go against thermodynamics (they decrease the entropy of the universe!). You cannot convert the energy of unpolarized light into fully polarized light while keeping the same beam cross section and divergence angle (etendue). If you don't mind this, you can convert much more than 50% of the bulb light into one polarization (as LCD projector designers strive to do).
LCDs have a linear polarizer at the front and another at the back. If they are reflective LCDs they also have a mirror behind the second polarizer. The idea of having a sacrifice polarizer to absorb the heat could work. In that case the front polarizer of the LCD will let through most of the light (except of spurious losses, typically 15 to 20%).
A good source of inexpensive large film is www.polarization.com
Some of the recycling schemes proposed are impossible as they go against thermodynamics (they decrease the entropy of the universe!). You cannot convert the energy of unpolarized light into fully polarized light while keeping the same beam cross section and divergence angle (etendue). If you don't mind this, you can convert much more than 50% of the bulb light into one polarization (as LCD projector designers strive to do).
LCDs have a linear polarizer at the front and another at the back. If they are reflective LCDs they also have a mirror behind the second polarizer. The idea of having a sacrifice polarizer to absorb the heat could work. In that case the front polarizer of the LCD will let through most of the light (except of spurious losses, typically 15 to 20%).
A good source of inexpensive large film is www.polarization.com
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