Remote listening technique by using IR of wavelength 980nm

[Skyraper]

I am working on second phase of this experiment , I have to use an infrared beam of 980nm .
Actually i am facing problem in detecting this IR , as IR is invisible to normal eye,
other is that what sort of circuitry should i use to detect the reflected IR beam from the target.?
kindly i need some serious help in this regard. Thankyou

 

[tpetar]

Infra-Red Proximity Sensor Part 1
**broken link removed**

Infra-Red Proximity Sensor Part 2
**broken link removed**

 

[dick_freebird]

Wavelength is irrelevant other than consistency with the
detector. People also do passive window-vibration-optical
pickup, in order to not have a telltale illumination.

Go look at your photodiodes, any of them will have a
detection efficiency curve somewhere inthe datasheet
or app notes and most in the description at electronics
distributors.

About any silicon photodiode / phototransistor ought
to do, for raw sensitivity; optics, bandwidth, gain etc.
will vary. You might prefer a good-to-go photodetector
module.

If you are in a high clutter or solar illuminated setting,
a modulated laser and a synchronized AC-coupled
sampling detector would reject "DC" and out-of-band
optical inputs.

 

[Skyraper]

@ Tpetar , i am working on continuous IR , although your suggested links helped me in making ma concept but the point is that will i get reflected IR beam same as red laser ,i mean in straight line because further i have to use this reflected IR beam on photo detector and then to amplify that and listen that modulated IR beam...

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@ Dick_freebird
Thnaks for your help dear, but what do you suggest about a photodetector named as S1223 , will it do my job i.e to detect the reflected IR beam ?