Dalsa Piranha ES Series, User Manual

Page: 85 / 106

Piranha ES-xx User Manual
Teledyne DALSA 03-032-20070-02
85
4
Optical and Mechanical
4.1 Lens Mounts
Mod el N u m ber Lens Mou nt Op tions
All m od els M72x0.75 thread .
4.2 Optical Interface
Illumination
The am ou nt and w avelengths of light requ ired to cap tu re u sefu l im ages d ep end on the
p articu lar ap p lication. Factors inclu d e the natu re, sp eed , and sp ectral characteristics of
objects being im aged , exp osu re tim es, light sou rce charact eristics, environm ental and
acqu isition system sp ecifics, and m ore. The Know led ge Ceneter p age on ou r Web site,
w w w .teled yned alsa.com / m v/ know led ge/ ap p notes.asp x , p rovid es an introd u ction to
this potentially complicated issue. See ―Radiometry and Photo Responsivity‖ and
"Sensitivities in Photom etric Units" in the CCD Technology Prim er fou nd u nd er the
Ap p lication Su p p ort link.
It is often m ore im p ortant to consid er exp osu re than illu m inat ion. The total am ou nt of
energy (w hich is related to the total nu m ber of p hotons reaching the sensor) is m ore
im p ortant than the rate at w hich it arrives. For exam p le, 5

J/ cm
2
can be achieved by
exp osing 5m W/ cm
2
for 1m s ju st the sam e as exp osing an intensity of 5W/ cm
2
for 1

s.
Light Sources
Keep these gu id elines in m ind w hen setting u p you r light sou rce:

LED light sou rces are relatively inexp ensive, p rovid e a u niform field , and longer life
sp an com p ared to other light sou rces. H ow ever , they also requ ire a cam era w ith
excellent sensitivity, su ch as the ES-xx cam era.

H alogen light sou rces generally p rovid e very little blu e relative to infrared light (IR).

Fiber-op tic light d istribu tion system s generally transm it very little blu e relative to IR.