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From: Phil Hobbs on 19 Feb 2010 14:26
On 2/19/2010 10:06 AM, osr(a)uakron.edu wrote:
> Speaking strictly as a former laser show tech...
>
> 1. It takes about 60 watts of Q Switched light to kill a bug, and it
> doesn't really quickly kill them, it burns the wings off. Bugs fairly
> regularly die within 20 feet of the laser at the rare laser shows that
> still have that kind of power. But NO regulatory agency is going to
> allow that kind of widget into the backyard.
> Your looking at 3500$ for the galvos, And another 2500 for a decent
> laser in bulk, and I do mean in bulk, because at Q1 they are about
> 10,000$ give or take.
>
> 2. Blueray is not going to do that, 2 combined blue-ray diodes (405
> nm) running in their pulsed mode,
> would have a average power of about half a watt.
>
> 3. A while ago, a government sponsored group was talking about using
> lasers for female only selective kills.
> I suspect that is where he got the idea...
>
> 4. I love listening to the galvo bearing noise in his audio.. A lot of
> that is not wingbeat, its tracking loop...
> I suspect getting enough data for identification would require
> adding Doppler, and that is NOT easy.
> Cue Phil Hobbs...
>
> 5. The adaptive focuser required for a kill would have to move at
> about 2.5 Khz... Do the math, its not cheap.
> they exist, but not very cost effective.
>
> 6. Mozzies breed far faster then that thing can kill them...
>
> The hardware there is a CNI 100-200 mW 532 nm DPSS laser, That would
> NOT be a kill unless you tied the bug down and focused the beam on it
> with a lens. The scan head is a used galvo pair from a company called
> Scanlab, And the Schlieren derived imaging technique is NOT easily
> field deployed, there is a custom mask needed inside the camera lens .
> What 3M gets for a 1 meter square sheet of that retroreflector would
> fund a 24 pack of RAID in spray cans.
>
> If he needs 100-200 mW for tracking, that works out to about a 1 in
> 2000 shot at retinal damage at 10-20 feet, and a almost 100% certain
> damage to a human eye close in.
>
> While someone on his team has shown considerable skill in closing
> the tracking loop from camera to laser, this is not viable for laser
> safety reasons. One shot of the kill laser would be a retinal burn in
> a human.
>
> But what a viable way of getting some investor to pay you to have fun
> for 6 months or a year.
>
> Schlieren for tracking: http://www.mne.psu.edu/psgdl/imageswebpage.html
>
> http://www.mne.psu.edu/psgdl/imageswebpage.html
>
> Steve ..

I wonder if they got the idea from me? My book, first published in
2000, has a very similar system used as a tongue-in-cheek example for
signal level calculations.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
From: JW on 22 Feb 2010 07:41
On Fri, 19 Feb 2010 07:06:59 -0800 (PST) osr(a)uakron.edu wrote in Message
id: <0dd36066-8396-4268-84fb-629f86141dbf(a)f15g2000yqe.googlegroups.com>:

>Speaking strictly as a former laser show tech...
>
>1. It takes about 60 watts of Q Switched light to kill a bug, and it
>doesn't really quickly kill them, it burns the wings off. Bugs fairly
>regularly die within 20 feet of the laser at the rare laser shows that
>still have that kind of power. But NO regulatory agency is going to
>allow that kind of widget into the backyard.
>Your looking at 3500$ for the galvos, And another 2500 for a decent
>laser in bulk, and I do mean in bulk, because at Q1 they are about
>10,000$ give or take.
>
> 2. Blueray is not going to do that, 2 combined blue-ray diodes (405
>nm) running in their pulsed mode,
>would have a average power of about half a watt.
>
>3. A while ago, a government sponsored group was talking about using
>lasers for female only selective kills.
> I suspect that is where he got the idea...
>
>4. I love listening to the galvo bearing noise in his audio.. A lot of
>that is not wingbeat, its tracking loop...
> I suspect getting enough data for identification would require
>adding Doppler, and that is NOT easy.
> Cue Phil Hobbs...
>
>5. The adaptive focuser required for a kill would have to move at
>about 2.5 Khz... Do the math, its not cheap.
> they exist, but not very cost effective.
>
>6. Mozzies breed far faster then that thing can kill them...
>
>The hardware there is a CNI 100-200 mW 532 nm DPSS laser, That would
>NOT be a kill unless you tied the bug down and focused the beam on it
>with a lens. The scan head is a used galvo pair from a company called
>Scanlab, And the Schlieren derived imaging technique is NOT easily
>field deployed, there is a custom mask needed inside the camera lens .
>What 3M gets for a 1 meter square sheet of that retroreflector would
>fund a 24 pack of RAID in spray cans.
>
>If he needs 100-200 mW for tracking, that works out to about a 1 in
>2000 shot at retinal damage at 10-20 feet, and a almost 100% certain
>damage to a human eye close in.
>
> While someone on his team has shown considerable skill in closing
>the tracking loop from camera to laser, this is not viable for laser
>safety reasons. One shot of the kill laser would be a retinal burn in
>a human.
>
>But what a viable way of getting some investor to pay you to have fun
>for 6 months or a year.
>
>Schlieren for tracking: http://www.mne.psu.edu/psgdl/imageswebpage.html
>
>http://www.mne.psu.edu/psgdl/imageswebpage.html
>
>Steve ..

Well, there goes my hopes for outdoor entertainment at a soon to be summer
night. Thanks for the interesting info, though...
From: osr on 22 Feb 2010 09:08
No,, entertainment is still possible. Xenon arc lamp, and some moist
co2 to attract them, and a cheap co2 laser, mounted on a 3 meter
pole, angled up at 15 degrees at 10-20 watts to kill them. just
downcollimate the co2 beam, 10 micron IR does a wonderful job on
flying mozzies, and 2 feet away its safe for you and 20 feet away its
safe for aircraft, birds etc... 3 meters is the 21 cfr 1040.1 height
for laser safety.. ;-)

Steve
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