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Hacking a laser tape measure
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N_Cook
Mar 6, 2019, 4:02:48 AM3/6/19
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A neat cheap little 50m range (checked true) measurer, would it be
possible to change the f crystal to hopefully f/3 or so and get 150m range.
Assuming (looks possible) to split send and receive and enlarge the 15mm
capture window to 150mm window.
Also assuming I can identify which is the crystal and is not integral
with the ASIC, not epoxied over anyway. Would the LCD likely become
unreadable at 1/3 the original drive f. Accuracy would be worse but
decimeter resolution over 150m would be fine
possible to change the f crystal to hopefully f/3 or so and get 150m range.
Assuming (looks possible) to split send and receive and enlarge the 15mm
capture window to 150mm window.
Also assuming I can identify which is the crystal and is not integral
with the ASIC, not epoxied over anyway. Would the LCD likely become
unreadable at 1/3 the original drive f. Accuracy would be worse but
decimeter resolution over 150m would be fine
peterw...@gmail.com
Mar 6, 2019, 7:05:58 AM3/6/19
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MY concern would be whether or not the optics would support the longer distance. After all the trouble, you might have just a piece of landfill.
A Bosch device capable of that 150 feet is about US$60 these days, or less. And a cheaper off-brand device may be had for less than US$30.
Peter Wieck
Melrose Park, PA
A Bosch device capable of that 150 feet is about US$60 these days, or less. And a cheaper off-brand device may be had for less than US$30.
Peter Wieck
Melrose Park, PA
N_Cook
Mar 6, 2019, 7:34:01 AM3/6/19
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not poking around inside yet.
Just in the process of boring/grinding a hole through a 150mm glass 3
dioptre magnifying glass to try passing the the transmit beam thru the
centre and then larger capture area for the focussed received, to see
how that works at 50m initially, ie how much darker a "reflector" would
be the new minimum .
N_Cook
Mar 6, 2019, 9:58:23 AM3/6/19
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in line with the hole, can produce a 5m reading without forcing errors
from its operational window , across the room.
Now to mount in a rigid tube , to try outdoors, over 50m span.
Sjouke Burry
Mar 6, 2019, 12:24:57 PM3/6/19
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(twice the square law), so I think you are out of luck.
tabb...@gmail.com
Mar 6, 2019, 1:13:45 PM3/6/19
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NT
whit3rd
Mar 6, 2019, 4:22:56 PM3/6/19
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On Wednesday, March 6, 2019 at 9:24:57 AM UTC-8, Sjouke Burry wrote:
> On 6-3-2019 10:02, N_Cook wrote:
> > A neat cheap little 50m range (checked true) measurer... enlarge the 15mm
> On 6-3-2019 10:02, N_Cook wrote:
> > capture window to 150mm window....Accuracy would be worse but
> > decimeter resolution over 150m would be fine
> return power on the detector will be 81 times less than it is right now,
> (twice the square law), so I think you are out of luck.
You might consider using a retroreflective surface as your target (there's
> return power on the detector will be 81 times less than it is right now,
> (twice the square law), so I think you are out of luck.
corner-cubes, bike reflectors, or Scotchlite products available).
Mike Coon
Mar 7, 2019, 3:29:10 AM3/7/19
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In article <a82e7e13-2aa9-4597...@googlegroups.com>,
whi...@gmail.com says...
Perhaps that depends on whether the target being ranged is barely
intended to be aware of the red dot on forehead! (I have not been
reading all this thread...)
BTW Does the bigger window have a lens to concentrate the flux onto the
same sensor?
Mike.
whi...@gmail.com says...
intended to be aware of the red dot on forehead! (I have not been
reading all this thread...)
BTW Does the bigger window have a lens to concentrate the flux onto the
same sensor?
Mike.
peterw...@gmail.com
Mar 7, 2019, 9:26:37 AM3/7/19
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On Thursday, March 7, 2019 at 3:29:10 AM UTC-5, Mike Coon wrote:
> BTW Does the bigger window have a lens to concentrate the flux onto the
> same sensor?
Whatever the intent - this is a perfect example of running down the proverbial rabbit-hole. Even if entirely possible, the results are dubious and the utility of the equipment destroyed except as a curiosity.
> BTW Does the bigger window have a lens to concentrate the flux onto the
> same sensor?
et...@whidbey.com
Mar 7, 2019, 12:17:36 PM3/7/19
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is destroyed or not. In fact, it seems to be working so far. I'm glad
he is posting his experiments.
Eric
N_Cook
Mar 7, 2019, 1:30:58 PM3/7/19
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power supply ISTR.
http://www.aga-museum.nl/page/geodimeter-model-12-
the 14 version.
I dug it out and opened it up before trying to power up.
1978/79 CMOS and TTL and a rat's nest of after-thought/fudge flying
components, despite OEM. Mini Nixi tubes I think rather than the pre-7
segment LED, electroluminescent displays , or perhaps mini CC display,
difficult to view.
Looking at the manual the original spec was up to 60km range with
exceptionaly clear visibility it says ,and requiring one of those
multi-prism reflectors , they left on the moon.
I'd still rather mod a new replaceable DIY unit than this EDM that
should be in a museum.
peterw...@gmail.com
Mar 7, 2019, 1:38:35 PM3/7/19
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On Thursday, March 7, 2019 at 12:17:36 PM UTC-5, et...@whidbey.com wrote:
> We don't know yet if the laser measure will work. Whether its utility
> is destroyed or not. In fact, it seems to be working so far. I'm glad
> he is posting his experiments.
Eric:
> We don't know yet if the laser measure will work. Whether its utility
> is destroyed or not. In fact, it seems to be working so far. I'm glad
> he is posting his experiments.
I am writing from the perspective of one who must rely on accurate measurements for revenue, and whose instruments are calibrated to this end.
For the purposes of a hobby - that is an entirely different matter.
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