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Just playing around with digital pinhole photography after Andy mentioned it the other day. Unfortunately, all it really shows is how much crap is on my sensor! I made a hole in a body cap, stuck a bit of black tape across it and then made a hole in the tape with a needle. I think some aluminium foil tape might be better than the electrical tape that I used.
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Vega Prime IR Scene computes and displays quantative sensor images of
any environment containing natural features, cultural features, and
dynamic objects. Sensor Prime utilizes the same source geometry
(OpenFlight) as Vega Prime providing fully correlated out the window
and sensor views.
For more information visit www.presagis.com
The new clothes completely plastic bagged to prevent ink (if there was any) in the security sensor from spilling out and staining stuff.
The new Balluff MICROmote® optical precision tube sensors are designed to detect free-floating air bubbles in transparent liquids. These free-floating air bubbles have dimensions smaller than their tube's inner diameter.
Circuit is powered from 5V readout circuit.
R1 sets the U1 LED current to 20mA. Photo transistor picks up reflections from items passing in front of the sensor and turns on when they do generating a positive pulse on pin 4.
R2, R3, C1 and Q1 generate a variable DC load. In this way variations in ambient light that the photo-transistor might pick up are removed. The result is the signal on U1 pin4 under static conditions is constant.
The low pass of R2 and C1 mean signals from passing reflector are not attenuated and pass on to the comparator circuit.
The combination of R21 and R39 ensure the voltage on U4 pin3 under static conditions is always slightly less than the voltage on IC4 pin 2. This ensures the comparator output is low in the absence of a signal.
C24 ensures the voltage on IC4 pin 2 does not react to fast signals but IC4 pin 3 does see these fast changes.
When an item is detected by the photo-transistor the voltage on U1 pin4 rises rapidly. IC4 pin3 sees the rising voltage which will rise above the voltage on IC4 pin 2, changing the comparator output state to a high signal.
Comparator is a push-pull output type so does not require a pull-up resistor. Pulses from comparator are passed on to the display to show speed of the sensor.
For Sensor (club culture magazine) long time ago. Color backgrounds by Sabob www.flickr.com/photos/7940175@N07/