Setup line array test system.
New DIY lens adaptor for the line array TSL202R module. I found an old Schneider 105/3.5 lens with broken shutter. I have removed the front and back lens part and put a new adaptor between the 2 lens parts. Both lens have an thread of 29.5×0.5mm, so I have to make the inside thread on the lathe, a precise task! At the end I have made a Nikon F-mount to put the hole lens on my standaard Nikon interface.
To control the correct focus, the adaptor can shift 50 mm in and out the F-mount adaptor. This works nice for the min and max work distance of the Nikon cameras. The lens has a F 3.5 and the signals on the TSL202R array are nice.
For the results of the tests see:
Now a green 10 mW laserpointer is used instead of the red 1 mW pointer. The integration time here is 71.3 us. If need I can use a shorter time as long as the ambient light is not to high, there is no problem. The green laser gives much more output despite he is not optimal in the pass band from the TSL202R line array sensor.
Depth resolution 1 pixel array shift = 0.416mm object change in depth at 600mm distance ( D300 camera sensor distance). D300 Camera frame = 82 mm.
DOF at 600mm, Macro lens AF105/2.8D, F18 = 19.4 mm = 46 array pixels
The TSL202R line array is 128 pixels. This means that any signal from -23 to +23 pixels from the centre may give detection, or in focus pictures. A very nice range for detection.
This means also, I can readout the other pixels at a higher data rate as I do no make the ADC convertion (take most time) due to the fact that they are out focus. Just in case of focus detection no speed or direction. ( The max speed is only need if the ambient light is very high so the line array readout a to high level from direct sunlight. I have to test this level next days but just now at 71 us integration time the level seens to be very low.
This primair algorithme is very easy to implement as first test. just look if any readout into the DOF range zone to trigger the cameras.
Frame………….. Distance object …… Distance line sensor.
125mm —————– 650 mm…………..68 mm
80 mm —————— 520 mm…………..70 mm
70 mm —————— 445 mm ………….73 mm
60 mm —————— 390 mm…………..77 mm
50 mm —————— 315 mm…………..81 mm
40 mm —————— 260 mm…………..84 mm
30 mm —————— 205 mm…………..91 mm
20 mm —————— 153 mm…………105mm
15 mm —————— 130 mm…………120 mm
14 mm —————— 125 mm…………124 mm
The distance to the line sensor is with only 1 part of the linhof 105mm lens. The frontside part is removed to optimalize the workings distance.
There is a new linsensor inuse now:
The new controller boards are here:
Tagged: , linhof , schneider , TSL202R , fotoopa , Nikon , F-mount , detector , high-speed , macro , macro-lens , DIY lens , Schneider lens , Schneider 105-3.5 , Schneider to Nikon , Linhof lens , Linhof 105mm lens , Linhof 105mm lens to Nikon , DIY 105mm lens , optical detector , 3D MACRO , 3D photography , 3D insects , 3D in flight , 3D beelden , 3D fotografie , 3D photo , highspeed macro , high-speed capture , high speed laser detector , highspeed photography , high speed shutter , high-speed hardware , highspeed detector , flying high speed insects , D300 high speed