TruPulse Tests   Bob Leverett
  Oct 30, 2007

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TOPIC: Semi-interactiveTruPulseTest
http://groups.google.com/group/entstrees/browse_thread/thread/a3a9206eec9bd880?hl=en
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== 1 of 1 ==
Date: Tues, Oct 30 2007 10:43 pm
From: dbhguru


ENTS,
 
    The attachment shows the configuration of 17 points in 3-dimensional space. The points are, in fact, selected spots on a bookcase that is filled with books and other objects. The following table on the left shows tape measured distances between pairs of selected points. The right table shows laser-measured distances for the first 4 pairs..
Distances  by tape Distances  by laser
Pts Dist Pts Dist Tripod
1-2 2.6 1-2 2.6 Yes
1-3 3.4 1-3 3.3 No
1-4 2.45 1-4 2.5 Yes
1-5 2.15 1-5 2.2 Yes
1-7 3.25 1-7    
1-15 4.8 1-15    
2-4 2.25 2-4    
2-5 3.4 2-5    
2-6 4.15 2-6    
2-7 5.1 2-7    
4-5 1.3 4-5    
4-6 1.65 4-6    
4-7 2.53 4-7    
8-9 1.1 8-9    
8-17 0.75 8-17    
10-11 0.92 10-11    
10-12 1.2 10-12    
13-14 1.5 13-14    
13-15 1.45 13-15    
16-17 1.1 16-17    
Notes:
 1. Distances are in feet
2.  Tripod use indicated as yes, otherwise handheld

     I propose to make this table a work in progress. As I take additional measurements, I'll update the table and diaplay it. I'll likely add more pairs as we go. The purpose of my approach to this experiment is to explore the capabilities of the TruPulse 360 in a progressive, semi-interactive way with members of the list. The way I'm doing it is a little crude, but I think it will work. As I move along, I cordially invite fellow and lady Ents to make comments and suggestions. I'll implement as many as practicable. I hope this experiment will prove fun and enlightening. I'll leave it to Ed to think of a way to compactly present it on the website. I think Laser Technologies is going to be pretty happy with the results I'm getting.

     As you can see, so far, the 360 is proving to be incredibly accurate, far surpassing my expectations. Most of the measurements will be taken with the TruPulse on a tripod. Some will be taken by hand, where I can manipulate the tripod to get a pair. Sometimes I may repeat a measurement, first with tripod and then without. 

Will,

    The target bookcase is the one to the back and to the left of your head where you slept while staying with Monica and me. I can't wait to use the TruPulse to model that big tuliptree near Gary's house.

Bob


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TOPIC: TruPulse 360 Test
http://groups.google.com/group/entstrees/browse_thread/thread/74be23060364d3fe?hl=en
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== 1 of 1 ==
Date: Tues, Nov 6 2007 1:28 am
From: dbhguru


ENTS,
What can one do at 3:00AM when one can't sleep because of the blasted pain of the shingles? Ah, that's an easy question. One sets up a measurement experiment with the TruPulse 360. Yes, I started by putting small pieces of reflective tape on the double window frame at one end of the basement room that Monica and I have set up as my personal space. Then I go to the opposite end of the room and shoot to different pairs of the pieces of tape using the TruPulse's missing line routine. The following table shows distances from one designated point to another.
PtsDist
1-22.9
1-35.8
1-47.1
1-55.1
1-76.1
1-83.6
1-92.0
2-54.1
2-82.0
3-55.1
3-67.1
5-62.9
6-83.6
7-82.8
7-95.7
8-52.1
9-46.2

I can't post the actual layout because they are graphics objects that won't copy, but some of the above pair are on the vertical, some on the horizontal, and some on the diagonal.
I did two sets of measurments. The results are shown below.
Measurement Cluster #1
PtsMeasActDiffAbs Diff
1-23.22.90.30.3
1-36.15.80.30.3
1-47.87.10.70.7
1-55.35.10.20.2
1-64.14.100
1-76.46.10.30.3
1-83.63.550.050.05
2-54.14.100
2-81.92-0.10.1
3-67.57.10.40.4
6-83.63.600
7-83.12.80.30.3
Avg 0.2040.221

Measurement Cluster #2
PtsMeasActDiffAbs Diff
3-54.95.1-0.20.2
5-62.92.90.00.0
5-24.04.1-0.10.1
4-65.95.80.10.1
8-52.02.1-0.10.1
6-37.27.10.10.1
8-73.02.80.20.2
4-17.47.10.30.3
1-91.92.0-0.10.1
9-46.56.20.30.3
6-37.47.10.30.3
7-95.95.70.20.2
Avg 0.0830.167

The combination of the two clusters in terms of absolute differences follows.
Summary
0.3
0.3
0.7
0.2
0
0.3
0.05
0
0.1
0.4
0
0.3
0.2
0
0.1
0.1
0.1
0.1
0.2
0.3
0.1
0.3
0.3
0.2
0.194

So, the average of the absolute differences of measured versus actual is 0.194 feet for the 24 trials. Sweet! So now, what am I going to do? Well, I think I can finally sleep, so I'm going lay down on the couch with my trusty TruPulse 360 and snuggle it. TruPulses are people too and need lots of love.
Bob