Radar & Laser / Lidar information Pages
LTI Marksman 20/20 Beam Pattern testing
So I was bored and shooting the LIDAR inside when I realized
the NightVision of the Sony Handicam
showed more than just the light from the unit when reflected in the window.
Here's the beam pattern by Night vision on a kitchen steel door.
Here's some close to scale comparisons.
Its a shade under 2"
Above is sweeping the beam across the floor. ~ 5 Feet or so.
Two plate pattern reflections from approximately 30 feet
Plate above has the numbers altered. Black circle approximates beam.
Each License plate measures out to ~ 6" x 12"
Two looks at the beam pattern off the wall at 28 feet indoors.
Sweeping the beam across the kitchen floor ~5 feet.
These stills are viewfinder shots of video, shot from a tripod
98 feet from the target, ZOOMED in. With Night vision "on".
A "laser" reflective measuring rod is to the left of the old Wisc., plate
I used Sethy's beam
and at 100 feet, the beam is approximately calculated to: 3.6 inches.
Since the plate above is 6" high, (photos above) I estimate the beam
to be 4" - 4 1/2 inches on this LTI Marksman 20 / 20.
The beam (reflection) at 125' is less pronounced than @ 100 feet,
but the beam appears to be almost 6" wide.
Using the "laserwidth.exe" calculation program above, the 125' yields a "4.5" beam"
Here's where the LTI beam pattern emerges.
Blue local ordinance sign
663 and 666 feet TWO different signs
The Marksman LTI 20/20 beam is still like the older LTI 20/20.
In the pictures below the beam seems bigger than 24" like Sethy's calculator would compute @ 666 feet
There was a German study of LIDAR beam patterns and they came
up with a similar pattern of varying intensities at 300' indoors.
referenced and shown in the MNA.org members section here:
The above and below photos are the same sign: 41 inches x 41 inches.
Each letter on the sign is 6" tall and the space between each word line is 2"
Here's the measurement. The camera was positioned ~665 feet back of the sign
and the Sony Handicam with night vision was zoomed in to full digital zoom (450x)
The camera was later backed off the full optical zoom ~25x.
THE LTI Marksman 20 / 20 is verified to have
a 3 beam like pattern of intensity at 666 feet.
I went back and shot the same sign from farther away:
Remember these are digital pictures OFF a video camera view finder.
The above two photos are beyond 750 feet and are pixelated due to the distance zoomed.
653 feet Green sign.
761A Left Upper 760A Right Upper
758A Left Lower 757A Right Lower
Admittedly these pictures came out Horrible.
I'll take some newer ones and post those.
I thought the green sign would come out best, but the orange is the winner!
670 Feet Warning Sign NH:
This Orange Sign is clearly the best surface to determine the beam pattern size.
A better job of focusing here too. "Picket Fence" Beam pattern.
Too me it looks like the center "concentration" is aligned a wee bit higher then the outer "beams"
Admittedly in order to get the reflection the area has to be DARK. Focusing is a chore.
Even with the auto focus disabled the beam pattern is hard to distinguish.
Laser Diode inside:
Why bother with the signs when the answer is inside the Tx lens?
Stalker LIDAR for comparison below.
TX or RX lense your choice: 2"
Two LIDAR guns