engineering innovation
ISSI
Innovative Scientific Solutions Inc 2766 Indian Ripple Road Dayton, OH 45440-3638 937-429-4980
LED Light Sources
PSP/TSP measurements require very stable and bright light sources, with specified narrow-band-spectrum output. Output power should be sufficient to provide short exposure time, even for large or real scale models.
Specifications
General
Sturdy, black-anodized-aluminum housing.
Comes complete with optical filter, diffuser, power supply, manual, tools, and storage case.
Lamps are available in 2- and 4-in. sizes. (76 LEDs and 341 LEDs, respectively).
Standard lamps are for continuous-output operation, but pulsers are available for each size. These pulsers can be easily installed in the field.
Lamps are modular to allow easy change of circuit modules, which allows the wavelength to be changed to any available LED wavelength.
Standard delivery is 3-4 weeks after receipt of order.
Continuous-output lamps (dc)
Lamps are shipped with a 10-deg diffuser as standard; other diffusers are available (20 and 30 deg). Directivity of lamp emission without diffuser is a 15-deg half angle (produces a 4-ft-dia. circle at 8-ft distance). DC output noise is < 0.5% peak to peak.
Long-term stability is ~ 1.0% after 5 min, 0.1% after 20-mn operation.
Pulser Module
The pulser increases the peak optical output by a factor of 6 over continuous-output lamps. The pulse-to-pulse repeatability is better than 0.1%.
The pulser module requires an external pulse generator to gate the optical pulse. The gate input is TTL logic-compatible, with an impedance of ~ 120 ohms.
The pulser module provides a drive current of 200 mA to each LED. This drive-current level requires a duty factor of 5% maximum, with pulse width not to exceed 1 ms. Pulse widths of up to 10 ms are possible at a reduced duty factor of 1.0%.
When using the 4-in. LED module, a maximum pulse width of 5 ms is recommended. All LED modules can be configured for 0-100% duty cycle using the 20-mA/diode drive level. Consult factory for details.
Optical output:
Half width:
Output power:(2 in.)
(4 in.)
UV
(395 nm)
20 nm
0.32 W
1.43 W
Blue
(464 nm)
30 nm
0.25 W
0.90 W
Green
(520 nm)
40 nm
0.125 W
0.560 W
Optical Output
Blue LED power
" energy
" energy
Green LED power
" energy
" energy
Pulse Width
any
10 ms
1 ms
any
10 ms
1 ms
Optical rise time
(10-90% points):
Optical fall time
(90-10% points):
Optical delay with
respect to gate:
Optical-output drop-off:
0.1 ms
1 ms
5 ms
2-in. Lamp
1.2 W peak
0.012 mJ/pulse
1.1 mJ/pulse
0.75 W peak
0.0074 mJ/pulse
0.68 mJ/pulse
0.3 us
0.15 us
0.15 us
1.5%
< 10%
33%
4-in. Lamp
5.4 W peak
0.054 mJ/pulse
" energy
4.9 mJ/pulse
3.4 W peak
0.034 mJ/pulse
3 mJ/pulse
0.8 us
0.2 us
~0.15 us
2%
< 10%
33%