Re: in laser guided bombs, the receptor/photodetector

On Feb 4, 3:28 am, Alan Dicey <a...@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
wrote:
extremewanderer wrote:
Please clarify that; in laser guided bombs, the receptor/photodetector
that is installed on the bomb sees the laser which is reflected/
bounced back from the target on which the laser beam is focused, and
then guides the bomb to the target, and does not, repeat does not, see
the “beam” that is being emitted by the laser beam emitter.
This is due the fact that the receptor/photodetector that is installed
on the bomb cannot see the beam in air as the laser can only be seen
when it is reflected of some object.

The bomb guidance kit is looking for laser radiation of a particular
wavelength, probably with a coded ident signal.

So it will home on the laser light reflected off the target from an
infra-red laser designator held by a forward observer.

OR

It will home on the direct radiation from the designator if the observer
points it at the bomb, for a Pk of 2.  This is not generally
recommended, the observers are not keen on being blown up and the laser
designators are expensive bits of kit, specially designed to work as
stand-off systems.  Besides which, it is a bit obvious standing next to
a tank and pointing a big flashlight in the air.

The guidance system sees the spot (in infra-red, so the target can't see
it's being painted unless they use IR goggles) and corrects the fall of
the bomb to hit it.  Typically, the observer paints the target for
acquisition by the aircraft, then shuts off, the bomb is released and
the observer switches his designator back on once the bomb is a few
seconds from impact, for terminal guidance.

The characteristics the bomb is looking for (wavelength, coded signal,
general direction) mean that the signal can be locked on at longer
ranges compared to a plain uncoded bright light.

No detector would be looking for a "beam" of laser light like you might
see in a bad Hollywood movie.  The fact that the beam is reflected does
not change the signal parameters that the guidance kit will use for
recognition.

The use of an infra-red laser allows for precise designation of a target
at safe ranges (outside the effects of the bomb blast) by a concealed
forward observer, and a good probability of his surviving undetected.

I can't understand your obsession with a system that doesn't need the
light to be reflected.  This is of no operational use that I can
understand - can you expand on how such a system would be used and the
advantages you expect to gain?  As far as I can tell, you're planning to
somehow plant a laser emitter actually on the target - which the enemy
would find much easier to detect and neutralise.

Tank laser rangefinders have completely different characteristics, they
are measuring distance by time-of-flight of the light beam.

No,no, ofcourse the light needs to be reflected.
My question is;
Now, what if there was a method by which a spot of light which does
not need something to bounce off and is visible to the receptor/
photodetector that is installed on the bomb.
Meaning the light is reflected & detected by the receptor/
photodetector without having to bounce off the target, without needing
something to bounce off.
Pls see the diagrams below;

Fig 1
-------------------------------------------------------{}


In fig 1, dashed line is laser beam, the brackets represent the
target, the laser needs to touch the target and then bounce of in
order to be detected.


Fig 2
------------------------------------------------------O {}


In fig 2, dashed line is laser beam, the brackets represent the
target, the circle represents a spot of light in front of the target
which does NOT NEED TO TOUCH THE TARGET and then bounce of in order
to be detected.

.

Relevant Pages

  • Re: in laser guided bombs, the receptor/photodetector
    ... that is installed on the bomb sees the laser which is reflected/ ... then guides the bomb to the target, and does not, repeat does not, see ... the “beam” that is being emitted by the laser beam emitter. ...
    (rec.aviation.military)
  • Re: in laser guided bombs, the receptor/photodetector
    ... that is installed on the bomb sees the laser which is reflected/ ... then guides the bomb to the target, and does not, repeat does not, see ... the “beam” that is being emitted by the laser beam emitter. ...
    (rec.aviation.military)
  • Re: in laser guided bombs, the receptor/photodetector
    ... that is installed on the bomb sees the laser which is reflected/ ... then guides the bomb to the target, and does not, repeat does not, see ... the “beam” that is being emitted by the laser beam emitter. ... some countermeasures can look for the emitter and target that. ...
    (rec.aviation.military)
  • Re: in laser guided bombs, the receptor/photodetector
    ... instead of reflecting the laser beam, absorbs it and the laser beam ... does not reflects off /bounce back from the target, so the detector ... can't see the target. ... that is installed on the bomb sees the laser which is reflected/ ...
    (rec.aviation.military)
  • Re: in laser guided bombs, the receptor/photodetector
    ... that is installed on the bomb sees the laser which is reflected/ ... then guides the bomb to the target, ... the ´beam¡ that is being emitted by the laser beam emitter. ...
    (rec.aviation.military)
Loading