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LF353-N: LF353-N

Cabir Bilirgen
Prodigy 20 points
Part Number: LF353-N
Other Parts Discussed in Thread: TL441

Hi all

I am an electrical engineer from Turkey

I have a 600 RPM revolving laser 630nM red

 I made a receiver including BPW34 photodiode with LF353N opamp with an PIC16F877A Microprocessor

At nearly 300 meters I can sometimes sense the laser but if there is much sunshine or very dark at night I have to calibrate my receiver every time

Can you help me to incrase the sensing quality ant eliminate ambient light

Thank you in advance

Best regards

Cabir Bilirgen

<email address removed>

Ps: 600 rpm is 10 per second and at 300 meters radius means nearly 2000 meters 2,000,000 milimeters circle length at let's say 5mm diameter laser

It goes to very small duty cycle

  • 0
    TI__Guru*** 140106 points
    Cabir,

    I'll use your Ps numbers. Receive time is 0.0005m / (2000 m * 10revs/sec) = 25ns which is 40MHz. LF353-N seems to be too slow to respond. If the actual signal from the optic transducer is longer than that, then I suspect the sensor is too slow so it is not very responsive (less gain and bandwidth). The op amp needs to be faster and maybe a faster sensor is needed.

    Some possible improvements include Automatic gain control, TL441 logarithmic amplifier input stage, timing phase lock to the 10 Hz signal to create blanking periods to block out other noise sources.
  • 0 in reply to Ron Michallick
    TI__Guru*** 140106 points
    Cabir,

    Were you successful in finding a solution?