Slave Trigger
High Speed Photography 2
High Speed ??Photography (HSP) or high-speed photography is used by scientists for research purposes in the field such as physics, chemistry, metallurgy, biology, etc..
Two factors are required at HSP:
1. Expose a super high speed (1/10.000 1/50.000 seconds even for special purposes can 1/1.000.000 seconds), high speed can not be done by opening Rana, necessitating another approach that is by the duration of the flash flame brief.
2. Expose the Moment to be precise, this is the most difficult if we only rely on sensory reflex speed (apart from that no delay camera expose of us who do not allow us to use it), it is necessary for a sensor system that could trigger the flash on when we want.
1. Flash
Basically all the flash in the market can be used as long as we want to modify the flash TSB (there is a revamped elektronikanya series), which is easy to modify the flash that has TTL Auto or function, either permanently with dismantling tool elektronikanya (Just a short connecting tyristornya series only) or manipulate the flash sensor with a white paper only.
Its easier if the facility has lightning lights power down (anyone can,, 1 / 8,, up to 1 / 128) because the smaller the power generated, the smaller the duration of the flame of the lamp (see picture)
Black curves are the characteristics of the LEDs flash at full power.
Green curve, power curve for a particular type of flash if the reduced power of power.
Red curve and blue lights flash characteristics in general if dikuranggi strength power. (Other than a shorter duration, intensity is also smaller).
Used is usually the Te is the duration of the flame on the third (or) peak power.
In general, effective duration (Te) the flash is about 1 / 500 1/1.000 seconds (2000 microseconds 1000 with 1 microsecond = 1/1.000.000 seconds), with a decrease of the strength (power) lights then we can shrink the duration of Te to 200 20 microseconds or 1/5.000 -1/50.000 seconds) The smaller the duration of power on the smaller lights, so ideally we have a flash that has a GN so great that if we use 1 / 32 power, it is still quite GN to expose large photo).
(Regarding how to modify the electronic I can not discuss because I also have lots of electronic books open again ya., But in principle the flash sensor is a light sensor which, when exposed to light many makaia will have a resistance value (ohm) small sensor nah This is our circuit shorted (or sliding wear resistance / variable resistors) so that we can adjust the flash power.)
2. Sensor triger
What we need in HPS is a sensor that can recognize the moment of the form: sound, motion, contact, and track. In addition we need a delay time (delay timer) to make sure we are when we want our flash lights, (Procrastinator this time we can set long-or absence of the order of micro-and milliseconds by changing the capacitance value of capacitors and / or resistance values ??resisstor.)
While we can make contact sensors manually, with the principle when there are objects on (press) contact sensors (such as a ball falling) then he will be connected, and we can plug the cord into the flash or the first time delay (of the form I attach it later on next article, now I'm also designing a contact sensor that is small enough and effective)
3. Calculate the long duration and delay timer lamp
There are several ways to calculate the duration (Te) our lights, if it was fast enough to freeze the object image are we going to photograph, one of them is by using a fan, in fact we can calculate exactly how many milliseconds Te lights, if we know exactly how many RPM fan that we have (may be seen from the specification of goods, or use the dynamo that sold in the market already knew its RPMs), if we do not know we can only measure in a qualitative way only.
How:
Pieces of black cardboard with a circular pattern.
create white lines mark (from the direction of the shaft towards the outside, thin-only) and double stick tape on the back of the cardboard.
bars off the fan and then stick the cardboard that has been cut.
Turn on the fan at top speed, the room is pretty dark photos using the flash will we measure his Te, from the shadow of a sign that we can we can measure how many degrees movement of the sign and if we know the fan RPM or Te at full power, then by simple mathematics we can measure how much Te our lights. In experiment I am doing the flash Te = 1 / 900 sec (obtained from speksifikasi flash) and the deviation of the line = 5.5 derajatmaka with power = 1 / 16 derived deviation = 0.4 degrees so the lines obtained Te 1 / 16 = 0.4 / 5.5 * 1 / 900 = 1/12.375 sec. Since I do not have a faster fan RPM her again then Te measurements with a smaller power so difficult. RPMs required 4-5 times higher in order to allow for more accurate measurements.
To measure the interval (lag time delay timer) it takes 2 pieces of flash, a single cable connected to the input trigger delay timer and a single output delay timer. Adjust the variable resistor and photos in a dark room. Obtained from two different points of the white line so that we can calculate the pause delay timer.
4. Experiments.
Many things we can do if the sensor has to be:
1. sensor noise, loud photographing objects such as broken lights, exploding balloons, punch balls tennis, golf, pistol bullets, and so on.
In this experiment I used a table top with acrylic, glass coated cardboard underneath the dark black, a flash lamp (power 1 / 32) which is placed behind the acrylic, black cloth on the left, right, rear and top table top. Preliminary tests performed with the light off in the form of lighting and lighting with lights switched on, here obtained from the diaphragm value and the distance the flash to acrylic (because we can not be as good as the diaphragm and adjust the flash power, in addition to produce a vignette effect to a photo).
2. Sensor light (dark triger), the principle of this sensor is that if an object passes optocopler (pair of infrared LEDs and photo transistors) then the LED light will be blocked so that objects do not get a photo transistor light (dark conditions) then the sensor will trigger the lights. So we can photograph: droplets of water, falling objects, the motion of string / string / rubber vibrating, photographing small animals (bees, hummingbirds, etc.), if the distance between the LEDs and photo transistors are very large it would require a light focusing system or using a laser beam (which many are sold as children's toys)
In this experiment I used a table top with acrylic, glass coated cardboard underneath the dark black, a flash lamp (power 1 / 16) which is placed behind the acrylic, black cloth on the left, right, rear and top table top. Previously performed experiments by dropping money from above the sensor and altitude also play a variable resistor sensor to obtain the desired effect of falling, but it also found the location (and distance) flash right to produce the desired lighting effect.
3. Contact sensors, we can memotert reflection Ball, animals, etc. punch the ball in the racket. (Experiment I will do in the near future)
The key to successful photography is:
Set the timer delay so that we can get the right moment, this requires many times the experiment, record any changes in delay timer settings and distance sensor into our POI.
Lighting, this is because we only have a small lamp that had GN. We can also use two lamps, branded and type the same origin and we connect the lights to trigger the same, do not use a system of slave units, because the slave unit akam causes different flame time (although only about milliseconds, but the HPS is taboo.
If we try to use one light the lamp near the object, if the object is large enough then we have to wear confounders (small soft box) so that the contrast and shadows of objects maintained. Then use refektor a high reflective value (can be aluminum foil or even a mirror).
If we have a DSLR, it would be helpful again, because we can plug in ISO 200 or 400, so the limitations of small notes can be reduced, and we can use a fairly small aperture opening, to get the DOF that the range is wide.
Since we will use the speed of B, or a few seconds (2-4 seconds), then the room must be dark enough (not necessarily in total darkness), and this raises other difficulties, such as setting our movement, use a small flashlight to simplify our experiments.
Use Tool to experiment successfully, such as tripot, insulation, black cloth, etc., so not too dizzy in the trials.
And last .., a lot of dreaming and imagining what would make an experiment that has not been tried.
About the Author
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Slave Trigger
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