IR Laser Question

Gary D.

IF using an Infrared Laser diode (980 nm) with the Freqout instruction, would it detect on the Infrared receiver?

"implying that interfacing with the 3v diode driver circuit."

Or is this one of those Trial and error type of questions....

thanks for any help.

Gary D.


Always Remember to use Proper eye Protection When Using Lasers !!

cyberbiota

Gary-

That would depend upon which IR receiver you are using. If the receiver is a simple photodiode/phototransistor that is sensitive at 980 nm (check the spec sheet), then yes. If you are using a receiver module that expects a modulated carrier frequency (typically 38 kHz, but there are a variety of them out there- check the spec sheet), then no- unless you are running the laser diode at the appropriate carrier frequency also. To know for sure we need a bit more info about your set up, and what you are trying to do.

peter

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Peter C. Charles

Director, Research and Technology
CyberBiota, Incorporated
Peter.charles@cyberbiota.com
http://www.cyberbiota.com

Gary D.

Well, I really would not like to mention my project at this time...
·(I like feedback when I post them in the Projects section)


In General:
i am working on a serial comunication system, IR Leds are not long range and spread light over distances.

The IR Laser diode and driver·allow the Laser to act like an standard led. when you apply 3v the laser turns on.

so i am assuming using the Freqout command (38 Khz) just as you·would an IR led·the IR detector would detect

the signal. does anyone know the Wavelength·of the IR emmiter sold in the parallax store?

I would just like to know if it is capable before buying the $50 IR laser.

Thanks,
Gary D.

Tibo

Hi,

The IR emitters wavelength is typically around 940-980nm.

BOE-BOT documentation (copyright PARALLAX) said...

The IR detectors have built-in optical filters that allow very little
light except the 980 nm. infrared that we want to detect onto its
internal photodiode sensor. The infrared detector also has an
electronic filter that only allows signals around 38.5 kHz to pass
through. In other words, the detector is only looking for infrared
flashed on and off at 38,500 times per second. This prevents
interference from common IR interference sources such as sunlight
and indoor lighting. Sunlight is DC interference (0 Hz), and house
lighting tends to flash on and off at either 100 or 120 Hz, depending
on the main power source in the country where you reside. Since
120 Hz is way outside the electronic filter’s 38.5 kHz band pass
frequency, it is, for all practical purposes, completely ignored by the
IR detectors.

++

Gary D.

Thank you very Much.... This now proves that a 980nm Infrared Laser can be pulsed at 38.5 Khz and the infrared detector will detect it. This is Excellent. now data transmittion can be done miles away....

Now thats Insane Engineering !!

GaryD.

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There are 10 kinds of people....

Those who know binary and those who Don't.

Chris Savage

Gary,

·· Insane are the kits you can buy which aim a laser at a window and receive the modulated reflection allowing you to effectively "listen in" to conversations from who knows how far away.· So modulating a Laser isn't uncommon, just needs to be adapted to a constructive use.·

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Chris Savage
Parallax Tech Support
csavage@parallax.com

Gary D.

Ok i didnt want to Mention my project but since you have to know... Try this insane engineering for example.

take a BS2, 5 IR detectors, a 30mW 980nm IR laser, a visible 650nm 10mW RED laser, IR serial Decoder, couple of High Bright Leds, and a vibrating motor.

now if you happen to multiply everything above by two, then you will have one awesome laser tag system. Oh yeah i forgot to mention, mount everything in an airsoft Mp5 submachine gun... and you have tactical laser tag.

now let your imagintion work on that...

Total system per gun $250

of course my system will have LCD screens built into each gun.