Handbook of High Speed Photography - IET Labs, Inc.
Handbook of High Speed Photography - IET Labs, Inc.
Handbook of High Speed Photography - IET Labs, Inc.
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TYPE OF APPLICATION<br />
REQUIREMENTS<br />
Single Flash<br />
Flash<br />
Duration<br />
Flashes<br />
per sec<br />
Relotive<br />
Intensity<br />
Trigger<br />
Delay*<br />
(Time)<br />
Method<br />
Illumination for portraits<br />
and other non high-speed<br />
photography (people and<br />
other slow objects)<br />
<strong>High</strong>-speed photography<br />
(birds' wings, breaking<br />
light bulbs)<br />
Ultra-high-speed<br />
photography (bullets in<br />
flight, shock-waves,<br />
high-speed machinery)<br />
Multiple Flash<br />
1/1000 s<br />
(1 ms)<br />
10-100/is<br />
<strong>High</strong><br />
Medium<br />
to <strong>High</strong><br />
1 /JLS Low to<br />
Medium<br />
Manual or<br />
Sync'd to<br />
camera (open<br />
or close switch)<br />
Manual or Sync'd to<br />
event by electrical,<br />
acoustical, optical or<br />
mechanical means<br />
Electronically<br />
sync'd to event<br />
by signal from<br />
microphone,<br />
photocell, etc.<br />
(1/25 s)<br />
Visual<br />
Electronic<br />
if any<br />
(1-100 ms)<br />
Electronic<br />
"Untimed" multiple<br />
exposure (sports,<br />
advertising, educational<br />
demonstrations) where<br />
precise timing<br />
unnecessary<br />
Precision measurements,<br />
Single frame<br />
<strong>High</strong>-speed<br />
Ultra-high speed<br />
100 /is 100 <strong>High</strong> Internal oscil<br />
lator, electronic<br />
signal from<br />
contactor, photo<br />
electric pickup,<br />
1-10 //s<br />
1 fis<br />
500<br />
1000<br />
Low to<br />
Medium<br />
etc.<br />
Pulses from<br />
calibrated<br />
internal oscillator,<br />
contactor, or other<br />
externally generated<br />
signal<br />
Visual<br />
Electronic<br />
Moving film, flashes<br />
not synchronized<br />
Moving film, flashes<br />
synchronized with camera<br />
1-100 /xs 400 Medium<br />
to <strong>High</strong><br />
1-100 /is 400 Medium<br />
to <strong>High</strong><br />
Pulses from<br />
oscillator or<br />
contactor<br />
Closed switch<br />
Precision motion studies<br />
(explosions, projectiles,<br />
vibrations)<br />
1-10 /is 100<br />
1000<br />
Low to<br />
Medium<br />
Calibrated<br />
oscillator<br />
'Refers to the delay between the input signal and the firing <strong>of</strong> the flash: thus, visual delay<br />
means that the delay between the occurance <strong>of</strong> the event and the flash depends on the photograph.<br />
TABLE 2-1.<br />
Table 2-2 lists the characteristics <strong>of</strong> several commercially avail<br />
able stroboscopes in a form that facilitates comparison <strong>of</strong> these charac<br />
teristics with those required in Table 2-1. The reader may notice that<br />
there is no strobe in the tables that satisfactorily answers the need for<br />
10
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