Experiments with IR indicators
01 Direct detection of 880 nm LED
radiation
This experiment describes the fundamental application of the IR indicators
IRI 1100 and IRI 1400 for testing 880 nm IR LEDs.
02 Direct detection of 950 nm LED
radiation
This experiment describes the fundamental application of the IR indicators
IRI 1100 and IRI 4400 for testing 950 nm IR LEDs.
03 Direct detection of 1300 nm LED
radiation
This experiment describes the fundamental operation of the IR indicators
IRI 1100 and IRI 1400 for testing 1300 nm IR LEDs for application of lightwave
conductors.
04 Direct detection of 1550 nm LED
radiation
This experiment describes the fundamental operation of the IR indicator
IRI 1400 for testing 1550 nm IR LEDs for application of lightwave conductors.
05 Determination of the focal point
of focused 830 nm laser radiation
It is shown how to determine the focal point of a small-power infrared
laser using the IR indicator IRI 4400. This experiment can also be made
with other lasers in the wavelength range of about 830 nm to about 1100
nm.
06 Testing of IR remote controls
Using the IR indicator IRI 1100, TV remote controls and their batteries
can be tested in a very simple way.
07 Detection of the IR part of sunlight
This experiment shows in a very impressive way the efficient conversion
of infrared sunlight into visible green light when using the IR indicator
IRI 4400.
08 Indirect IR detection by local
discharge
This experiment uses the limited storage capacity of the chargeable
IR indicators IRI 1100 and IRI 1400 for detecting even very small or very
high IR intensities. This method is also good for detecting IR radiation
at visually inaccessible places.
09 Detection of light incidence
This experiment uses the ability of chargeable IR indicators to store
light energy to detect a unique light incidence which results, for example,
when someone is looking into strange cupboards without permission.
10 Detection of visible laser beams
using laser safety goggles
Laser safety goggles have, according to their destination, a very high
absorption for the laser radiation to be tested. The laser beam remains
therefore invisible for the person who runs the experiment. There is a
solution for red lasers when using the IR indicator IRI 1400, provided
the laser safety goggles are permeable to green.
11 Interference patterns of the laser
diode unit of a CD player
When testing the infrared light emanating from a 780 nm laser diode
unit removed from a CD player using the IRI 1400, interesting patterns
will occur.
12 IRI 4400: nonlinear and two-colored
As a converting IR indicator card, the green emission of the IRI 4400
obeys a square law dependence from the IR intensity. For higher IR intensity
a second emission color can be noticed; its luminosity increases with a
power of 2.8.
13 IR permeability of materials
With an infrared indicator and an IR light source the permeability
for infrared light of foils and others may be determined in a simple way.
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