Part Number: DLPLCR6500EVM
Hi TI team,
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Part Number: DLPLCR6500EVM
Hi TI team,
Hi Anumol,
You can use the output trigger option where you can trigger the pulse generator the laser is connected to. The output trigger sends a trigger pulse while displaying the patterns on DMD. One triggers during dark time and the other triggers at the beginning of displaying image.
While you load patterns in Pre-stored pattern or Pattern-on-the-fly mode in TI provided DLP Lightcrafter tool, please make sure to check the output trigger option. You can get these signals out of J24 in the TI provided EVM
Please let me know if you need any additional information
Thanks
Sachin
Thank you for the prompt response. could you please let me know how this triggering is performed?
Are there any devices should be connected to the trigger input?
if so what kind of devices?
Could you please guide me in resolving this problem ?
Hi Anumol,
Considering your laser input to be driven @ 2Khz @1.5ns pulse width, you cannot directly connect the trigger output to your laser as the minimum pulse width of the output trigger 2 is 20us. You can either opt for a laser with 20us pulse input or use a 555 timer in monostable mode with output trigger pulse as trigger input.Below is the circuit.
where pulse width t = ln(3).R.C
You need to select the values of R and C such that t<1.5ns.
You can use TI provided 555 timer .
For 2Khz input, you can set the (exposure time + darktime) around 500us
Hope this helps.
Thanks
Sachin
Hi Anumol,
Could you let me know how you are planning to source your pulsated laser according to its specification? You can use the trigger signal as enable to the source instead. It would be a much simpler solution (without the use of any convoluted circuitry) if you already have a source.
Thanks
Sachin
Hi Sachin,
Attached are the specifications of the pulsed laser I have. I need to synchronize both light source and DMD in such a way that both should project light for one second at the same time. thus, I would get measurements corresponding to each pattern from the DMD from the single-pixel detector,
Thanks
Hi Anumol,
I have contacted the RPMC engineers for suggesting a product for sourcing the laser. Usually , we require special sources for driving such lasers and cannot be driven directly from DLPC900. I will come back to you with the product and a simple design for your requirement soon after I get reply from them
Thank you for your patience
Regards
Sachin
Anumol
What peak energy from your laser source and what portion of the DMDs active array are planning on exposing?
At 1.5 ns 1 mJ the peak output power is in the order of 660 kW.
That level of peak optical power could easily damage the DMD.
Please read our application note on using Laser Power Handling for DMDs
DLPA027 www.ti.com/.../dlpa027.pdf
Hi Carey Ritchey,
Thank you for your valuable comments.
The total 1080*1920 mirrors will be exposing with 1- 10W power
Thanks
Hi Anumol,
I received their reply. They are asking me about the type of application you are using so that they can suggest a Laser and its source. To make the communication better and faster, It will be better for you to directly contact them.
You can go to
http://www.rpmclasers.com/ and raise a request in their website for getting suggestions on the type of lasers and their source for your application.
Once you have decided the source after contacting your laser manufacturer, you can reply to this thread if you have any further queries.
Thanks
Sachin