THORLABS SLS303 Manuale utente
SLS303
Stabilized Benchtop IR
Light Source
User Guide
Stabilized Benchtop IR Light Source
Table of Contents
Chapter 1 Warning Symbol Definitions.............................................................................................1
Chapter 2 Safety...................................................................................................................................2
Chapter 3 Product Overview ..............................................................................................................3
3.1. Planck's Law and Blackbody Radiation ...................................................................... 3
3.2. Silicon Nitride Globar ................................................................................................... 3
3.3. Optical Configuration ................................................................................................... 4
3.4. Output Stabilization...................................................................................................... 5
Chapter 4 Getting Started ...................................................................................................................6
4.1. Parts List ....................................................................................................................... 6
4.2. Unpacking ..................................................................................................................... 6
4.3. Operation Elements...................................................................................................... 7
4.3.1. Lamp Housing Front and Back Panels .................................................................................7
4.3.2. Controller Front Panel ...........................................................................................................7
4.3.3. Controller Back Panel ...........................................................................................................8
4.4. Setup ............................................................................................................................. 8
Chapter 5 Operation ..........................................................................................................................11
5.1. Starting the Lamp ....................................................................................................... 11
5.2. Shutter......................................................................................................................... 11
5.3. Stabilized Operation and Monitor Output ................................................................. 11
5.4. Adjusting Collimation................................................................................................. 11
5.5. Application Ideas........................................................................................................ 12
5.6. LED Error Indicator..................................................................................................... 12
Chapter 6 Maintenance .....................................................................................................................13
6.1. Fuse Replacement ...................................................................................................... 13
6.2. Globar Replacement................................................................................................... 13
Chapter 7 Specifications...................................................................................................................16
Chapter 8 Mechanical Drawings ......................................................................................................17
Chapter 9 Certifications and Compliances.....................................................................................18
Chapter 10 Regulatory ........................................................................................................................19
Chapter 11 Thorlabs Worldwide Contacts........................................................................................20
Stabilized Benchtop IR Light Source Chapter 1: Warning Symbol Definitions
Rev B, August 4, 2021 Page 1
Chapter 1 Warning Symbol Definitions
Below is a list of warning symbols you may encounter in this manual or on your device.
Symbol Description
Direct Current
Alternating Current
Both Direct and Alternating Current
Earth Ground Terminal
Protective Conductor Terminal
Frame or Chassis Terminal
Equipotentiality
On (Supply)
Off (Supply)
In Position of a Bi-Stable Push Control
Out Position of a Bi-Stable Push Control
Caution: Risk of Electric Shock
Caution: Hot Surface
Caution: Risk of Danger
Warning: Laser Radiation
Caution: Spinning Blades May Cause Harm
Stabilized Benchtop IR Light Source Chapter 2: Safety
Page 2 CTN010315-D02
Chapter 2 Safety
The lamp comes with a switching power supply compatible with voltages from 100 to 240 VAC. There is no need
to change the fuse when selecting your regional voltage. If the user needs to change the fuse located below the AC
plug on the back of the unit, see Fuse Replacement on page 13.
SHOCK WARNING
High voltage inside. To avoid electrical shock, before powering unit, make sure that the protective
conductor of the 3-conductor power cord is correctly connected to the protective earth contact of
the socket outlet. Improper grounding can cause electric shock resulting in severe injury or even
death. Do not operate without cover installed.
WARNING
This unit must not be operated in explosive environments.
WARNING
Do Not Operate in Wet/Damp conditions.
WARNING
Do NOT look directly at the light source beam during operation. Do NOT place hand or body part in
the light beam as this may cause burning.
CAUTION: HOT SURFACE
The housing of the lamp housing can get very hot during operation.
Extensive contact may cause burning.
WARNING: HOT SURFACE
The temperature of the Globar module will exceed 200˚C during operation. Always wait for at least
30 minutes for the module to cool down before performing a module replacement. Always wear
gloves when handling modules or bulbs.
Stabilized Benchtop IR Light Source Chapter 3: Product Overview
Rev B, August 4, 2021 Page 3
Chapter 3 Product Overview
3.1. Planck's Law and Blackbody Radiation
A black body is an object that absorbs all incident electromagnetic radiation (e.g. light), no light passes through or
is reflected. However, despite the name, a black body will also emit electromagnetic radiation. The radiation of a
black body in thermal equilibrium is described by Planck’s Law:
(,) = 2
1
1
Where
I
is the radiated power per unit area of emitting surface per unit wavelength at temperature
T
;
K
is the
Boltzmann constant,
h
is the Planck constant,
c
is the speed of light.
By measuring the spectrum of the blackbody radiation, we can calculate the temperature of this black body.
Figure3.1 shows the radiated power per unit area I as a function of wavelength at various temperature.
Figure 3.1 Blackbody radiation at different temperatures
In real life, broadband light sources may vary widely from the ideal black body in terms of the frequency and intensity
of the light emitted. By comparing the light source to an ideal black body at a given temperature, one can
characterize the light source by the temperature of the black body radiator which has the same chromaticity, which
is known as the color temperature of the light source.
3.2. Silicon Nitride Globar
The Globar is a rod of silicon nitride with >99% purity. It comprises a high-resistance hot zone and low-resistance
cold end(s). A passage of current causes the high-resistance hot zone to heat, reaching a temperature of about
1200 Kelvin.
Figure 3.2: A Silicon Nitride Globar
At this temperature, the Globar generates light radiation mostly in the IR region. Figure 3.3 shows a typical output
spectrum of the SLS303 measured from 1000 to 5600 nm, compared to an ideal back body radiation at 1200 K.
The actual output of the SLS303 may extend to over 15 µm.
Hot zone
Stabilized Benchtop IR Light Source Chapter 3: Product Overview
Page 4 CTN010315-D02
Figure 3.3 Typical Spectrum of SLS303
3.3. Optical Configuration
The SLS303 is a silicon nitride Globar light source. The Globar is placed inside the housing. The output from the
Globar is then collected and collimated again with an Aluminum Reflector and a ZnSe collimating lens.
Figure 3.4 gives an outline of the optical configuration of the SLS303 Globar light source.
Figure 3.4 Basic Optical Configuration of SLS303
0.5 2.5 4.5 6.5 8.5 10.5 12.5 14.5 16.5
1E-5
1E-4
1E-3
0.01
0.1
1
SLS303
1200 K Blackbody
SLS303 Spectral Power Distribution
Relative Intensity (a.u.)
Wavelength (µm)
Globar
Aluminum Reflector
ZnSe Collimating Lens
Stabilized Benchtop IR Light Source Chapter 3: Product Overview
Rev B, August 4, 2021 Page 5
3.4. Output Stabilization
Unlike traditional light sources, the SLS303 will not suffer from a gradual decrease nor short term fluctuation in
brightness during its lifetime.
The SLS303 silicon nitride light source is equipped with an internal feedback loop and therefore can ensure a
constant intensity, low noise, and long life span. The principle of operation is depicted in the block diagram below.
The optical intensity is measured by an internal photodiode, which feeds its monitor signal to the controller unit.
The controller unit then adjusts the driving current of the power supply to compensate any drift or fluctuation in the
optical output.
Figure 3.5 Closed Feedback Loop in SLS303
Stabilized Benchtop IR Light Source Chapter 4: Getting Started
Page 6 CTN010315-D02
Chapter 4 Getting Started
4.1. Parts List
The package contains the following items:
•1 lamp housing
•1 controller unit
•1 operation manual
•1 cable for connecting lamp housing and controller
•1 power cord
•1 4 mm hex key
•1 2 mm hex key
4.2. Unpacking
The packaging of the SLS303 is shown in the picture below.
Figure 4.1 Packaging of SLS303
There are 6 major pieces of foam inserts in the packaging of SLS303 as shown in Figure 4.1. Remove them carefully
and take out the lamp and controller.
Controller
Lamp
Lamp Control Cable
Power Cord
Stabilized Benchtop IR Light Source Chapter 4: Getting Started
Rev B, August 4, 2021 Page 7
4.3. Operation Elements
4.3.1. Lamp Housing Front and Back Panels
Figure 4.2 Front and Back Panel of SLS303 Lamp Housing
•L1. Shutter Control Knob
•L2. Collimating Lens
•L3. 4-40 Threaded Holes for 60 mm Cage Systems
•L4. Adjustable Feet
4.3.2. Controller Front Panel
Figure 4.3 Front Panel of SLS303 Controller
•C1. Power Switch
•C2. Temperature Warning LED
•C3. Bulb Status Indication LED
•C4. Lifetime Warning LED
Stabilized Benchtop IR Light Source Chapter 4: Getting Started
Page 8 CTN010315-D02
4.3.3. Controller Back Panel
Figure 4.4 Back Panel of SLS303 Controller
•C5. Cooling Fan
•C6. Connector for Lamp Control Cable
•C7. Analog Out, 0-5V
•C8. Power Connector
•C9. Fuse Socket
4.4. Setup
Take the lamp housing out of its packaging and place it onto a table top. All four feet are height adjustable to
compensate for unevenness of the work surface.
To adjust the height, use a 4 mm ball driver or hex key (one is included with the SLS303) to loosen and remove the
cap.
Figure 4.5 Removing Caps on the Adjustable Feet
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