General Category > General Discussion

About the Lasershark projector

(1/2) > >>

zhang:
Hello, Nelson,

I'm a student from Image Lab, and the research which we are doing now needs to project an edge video with a laser device.

At first, we found the Openlase, feeling it so nice but we don't know how to start with the hardware(Our lab seems not be so familiar with the hardware things). And now we found your Macpod homepage. Although the tutorial of the hardware assembling is written, we still have no idea how to start because we don't familiar with the electronics board, so we want to know if it's possible to buy a set of a projector like this.

http://macpod.net/electronics/lasershark/lasershark_media.php


Or can you just give some advice about how we can choose the other components(supposing that we bought a shark board from you)to DIY a  laser scanner which can fit with the Openlase? We are not sure the components we found can be assembled and work together well.

We are looking forward to your reply! Thanks so much!

Macpod:
Hi, thanks for re-posting this on the forums. Answering the question in the public forums helps others searching for this information to find it.

Unfortunately I do not sell full projectors. This would classify me as a laser projector manufacturer and significantly increases requirements such as the need to handle laser variances.
Speaking of this, for your application, please verify that for your application your projector work follows all necessary laws and regulations in your area.

I am happy to review components if you post them here to determine if they will work or not.

Can you describe in more detail the complexity of these images you would like to trace? Do you have examples? This will impact the speed requirements of your galvos.

Do you also know what surface you will project onto, how far away this surface will be, the brightness of the room, and finally the laser colors you wish to use?

zhang:
Thanks for your reply!

So it seems that it's necessary for us to DIY the projector ourselves.

As for the necessary law of laser, I'm sure there is no problem for a 100-200mW laser device, despite the fact that we've already obtained a 400mW laser light.

The complexity of the images is simple(some edge images from the programs which use like Canny edge-detection) and project it onto the ground we walk. Projections of them on the ground may be echelons but we would fix it. The height of the projector is about 1m-1.5m and the color or the brightness is not so important for us. After all, it's the first try of it, and we may do the adjustment of them if the prototype works well.

The components may be:
1.The laser shark DAC board from Nelson.
2.a 100mw 532nm green laser module 5V with TTL.here
3.Galvos and Galvo amp: a XY galvo is enough as long as the laser's wavelength in the galvo's wavelength range ? But amplifier and the power of them we are not sure what to purchase. It may takes long to get all the components from Internet so we are cautious about which and what to buy.

Sorry for my poor descriptions and hope for some advice !

Macpod:
In the U.S. anything 5mW and over requires a variance. A 400mW laser would not be responsible to use in this application as it is both extremely dangerous and far too bright to look at!

For experimentation I would suggest a 4.999mW 520nm laser. I would suggest a 520nm direct drive vs a 532nm DPSS laser as you do not need to worry about leaky infrared light:
https://www.youtube.com/watch?v=iR1Ku5dnbH8
532DPSS lasers are also sensitive to temperature and can take a while to heat up if operated in a cold environment. 
Human eyes are particularly sensitive to green light so you do not need much (In a darker room I have used a 520nm projected on a projection screen 5M away to demonstrate lasers to students).

Galvos are usually sold as a kit consisting of the galvo, galvo amplifier, and power supply so you will not need to worry about matching these. You will need to determine the necessary KPPS (kilo-points per second) rating of the galvo. This will be dependent on how complex your shapes are. The faster the galvos are, the more traces per second you can draw and this will reduce "flickering" of the images.
Since you will be projecting images onto a surface in close proximity to the ground you will also need to account for the maximum galvo angle your galvos support.

zhang:
Thanks for your advice! ;D

And here's now some alternatives of components.

1.DAC board: laser shark Dac board.[/sup]
2.Emitter subsystem: At first we found this.520nm Green Laser Diode Module
It is straightly powered by a DC input power supply optional. But we found that it has no TTL modulation or analog modulation.

BTW, we want to know the reason why you suggest us buy one which capable of TTL or (ideally) 0-5v analog modulation. For RGB laser, the TTL or analog modulations may change the color of lasers, and of course the analog way can change MORE. But for a single color laser, what is the use of an analog modulation? Google told us that
--- Quote ---TTL only controls the on/off of a laser and, it can make the patterns "clean", which means no connected line of each letter if we want to project a word"LASER".
--- End quote ---
Dumb question but I just want to know is it right and what for an analog one. (may control the brightness according to input voltage?) :-\

And here are some other alternative lasers(feels hard to find a 5mW or about ones. ):
     1.w/12V AC Adapter 515nm 520nm 50mw Grass Green Laser LINE Module Osram LD TTL

     2.10mW 515-520nm Direct Diode Green Laser Module (Adjustable Focus) with TTL Modulation (12V)



3.Scanning subsystem:
     1.40Kpps High Speed galvo scanner for laser show lighting/RGB Laser system ScannerIt says that it acquires the "Deflection angle: max 70° optical (factory calibration @±25°)" and we are not sure whether it is enough to project patterns in the height of 1-1.5m to the 2-3m far distance from where it is set.

     2.
30Kpps HightSpeed Galvo scanner for Laser light show or 3D printer (max50Kpps)
It looks like that all the galvos detailers have the similar description of the spec details

4.And some cables or board to set them up. Or maybe a laser glasses?

Navigation

[0] Message Index

[#] Next page