Hacking a laser tape measure
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 |
Hacking a laser tape measure
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 |
Hacking a laser tape measure
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Hacking a laser tape measure
On 6-3-2019 10:02, N_Cook wrote:
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 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. |
Hacking a laser tape measure
On Wednesday, 6 March 2019 17:24:57 UTC, Sjouke Burry wrote:
On 6-3-2019 10:02, N_Cook wrote: 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 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. hence the larger window, 100x the area. NT |
Hacking a laser tape measure
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 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 corner-cubes, bike reflectors, or Scotchlite products available). |
Hacking a laser tape measure
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Hacking a laser tape measure
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. Peter Wieck Melrose Park, PA |
Hacking a laser tape measure
On Thu, 7 Mar 2019 06:26:35 -0800 (PST), "
wrote: 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. Peter Wieck Melrose Park, PA 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 |
Hacking a laser tape measure
On 06/03/2019 21:22, whit3rd wrote:
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 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 corner-cubes, bike reflectors, or Scotchlite products available). That reminded me one of these was laying neglected in the store, broken 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. |
Hacking a laser tape measure
On Thursday, March 7, 2019 at 12:17:36 PM UTC-5, 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: 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. Peter Wieck Melrose Park, PA |
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