LEPAS-12 Application Note③

LED pulse emission evaluation system
Measures the emission state of each pulse from an LED when operated in pulsed mode.
This system also performs time-resolved measurement within one pulse.
Recent LEDs offer high energy efficiency and so are increasingly being used for
lighting or illumination. Even higher power LEDs are under development. Besides
basic DC lighting, these high power illuminating LEDs also operate in pulsed
mode using an inverter circuit. The LED pulse emission evaluation system using
the Hamamatsu Laser Beam Profiler LEPAS-12 measures and analyzes the
optical intensity distribution at the moment of LED pulse emission using an
external trigger sync function and exposure time adjustment function.
Measurement and evaluation of beam emission pattern
by synchronizing with emission timing when LED is operated in pulsed mode.
Non-lighting
At rise
3D display
During lighting
3D display
Measurement
image
3D display
Measurement
image
Measurement
image
50 μs
118 ms (8.5 Hz)
Pulse
waveform
Exposure time 10 μs
Exposure time 10 μs
Exposure time 10 μs
LEPAS-12 Application
LED pulse emission evaluation system
System
configuration
ND filter set
A7659-01
Objective lens (A7659-03)
(Option)
×5 to ×20
Expanding optics
A6501-03
Laser Beam Profiler
LEPAS-12
Digital camera
for measurement
C8484-05G02
Timing I/O
External trigger
connector
A 9879
IEEE1394
I/F board
LED
IEEE1394
cable
A11327-04
Base for digital CCD
A9968-04
Frequency divider circuit
(pulse generator, etc.)
LED driver circuit
Analysis software
PC
Hardware
protect key
Signal cable
A3476-03
Trigger signal synchronized
with pulsed light
Trigger signal sub-divided
down to 8 Hz or less
Specifications
Optics specifications
Wavelength range
400 nm to1100 nm
×5
× 10
× 20
1.73 mm × 1.32 mm
867 μm × 660 μm
433 μm × 330 μm
Objective lens(1)
Measurement field-of-view
0.13
0.3
0.46
22.5 mm
16.5 mm
3.1 mm
1.29 μm max.
0.645 μm max.
0.323 μm max.
Incident N. A.(2)
Working distance
Read resolution
(1)Selectable by objective lens (option).
(2)An N.A. sufficient for LED intensity distribution is required to accurately measurement.
*Please consult us if you need other specifications than shown above.
Electrical specifications
8.5 Hz
Maximum repetition frequency(3)
10 μs to 1 s
Applicable pulse width
Trigger signal specifications
(4)
Amplitude
Termination impedance
Detection edge
TTL level
680 Ω
Rising edge
>10 μs
Trigger pulse width
(3)If the LED emission repetition frequency is higher than the maximum repetition frequency of the system, then the frequency must be divided
by using a pulse generator, etc.
(4)Measurement requires trigger signals synchronized with LED emission timing.
*When measuring a self-oscillating LED, electrical trigger signals must be generated from the emission signal.
Reducing filter set
Optics type
Wavelength
Transmittance (1)
A7659-01
A7659-03
600 nm to 1100 nm
400 nm to 650 nm
1/10, 1/25, 1/50, 1/100, 1/250, 1/500, 1/1000, 1/2500, 1/5000
1/10 000, 1/25 000, 1/50 000, 1/100 000
(1) In terms of transmittance, the A7659-01 shows an approximate transmittance in the wavelength range
from 650 nm to 850 nm, and the A7659-03 an approximate transmittance from 460 nm to 650 nm.
★ Product and software package names noted in this documentation are trademarks or registered trademarks of their respective manufacturers.
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• Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications and external
appearance are subject to change without notice.
© 2012 Hamamatsu Photonics K.K.
HAMAMATSU PHOTONICS K.K.
www.hamamatsu.com
HAMAMATSU PHOTONICS K.K., Systems Division
812 Joko-cho, Higashi-ku, Hamamatsu City, 431-3196, Japan, Telephone: (81)53-431-0124, Fax: (81)53-435-1574, E-mail: [email protected]
U.S.A.: Hamamatsu Corporation: 360 Foothill Road, P. O. Box 6910, Bridgewater. N.J. 08807-0910, U.S.A., Telephone: (1)908-231-0960, Fax: (1)908-231-1218 E-mail: [email protected]
Germany: Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: (49)8152-375-0, Fax: (49)8152-2658 E-mail: [email protected]
France: Hamamatsu Photonics France S.A.R.L.: 19, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: (33)1 69 53 71 00, Fax: (33)1 69 53 71 10 E-mail: [email protected]
United Kingdom: Hamamatsu Photonics UK Limited: 2 Howard Court, 10 Tewin Road Welwyn Garden City Hertfordshire AL7 1BW, United Kingdom, Telephone: 44-(0)1707-294888, Fax: 44(0)1707-325777 E-mail: [email protected]
North Europe: Hamamatsu Photonics Norden AB: Thorshamnsgatan 35 SE-164 40 Kista, Sweden, Telephone: (46)8-509-031-00, Fax: (46)8-509-031-01 E-mail: [email protected]
Italy: Hamamatsu Photonics Italia: S.R.L.: Strada della Moia, 1/E, 20020 Arese, (Milano), Italy, Telephone: (39)02-935 81 733, Fax: (39)02-935 81 741 E-mail: [email protected]
China: Hamamatsu Photonics (China) Co., Ltd.: 1201 Tower B, Jiaming Center, 27 Dongsanhuan Road North, Chaoyang District, Beijing 100020, China, Telephone: (86)10-6586-6006, Fax: (86)10-6586-2866 E-mail: [email protected]
Cat. No. SOCS0006E05
DEC/2012 HPK
Created in Japan