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SF10
Laser altimeter
The SF10 is a compact, lightweight
laser altimeter for above-ground-
level altitude measurement from
small fixed wing or multi-rotor craft.
The SF10 laser altimeter is ideal for
automated landings and precision
hovering.
The configurable features and
multiple hardware interfaces make
the SF10 easy to use with different
types of flight controller.
The SF10 laser altimeter uses a time-
of-flight system to make accurate
distance measurements to natural or
artificial surfaces.
SF10 Laser Altimeter - Product Manual - Revision 11
Product manual
Features:
•
Very compact and lightweight - 35 grams.
•
Accurate AGL altitude measurement on most
natural and artificial surfaces.
•
Fast update rate.
•
Includes serial, I2C, USB and analog interfaces
with programmable capabilities.
•
Easy to configure using the built-in menu and
LightWare Terminal
•
Fully calibrated and ready to run.
•
Accurate, reliable altitude measurements in
sunlight or dark conditions.
•
Not affected by: speed; wind; changes in
barometric pressure; noise; ambient light; terrain
or air temperature.
1
of
15
software.
© LightWare Optoelectronics (Pty) Ltd, 2016
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Summary of Contents for Lightware SF10
- Page 1 Not affected by: speed; wind; changes in distance measurements to natural or barometric pressure; noise; ambient light; terrain or air temperature. artificial surfaces. SF10 Laser Altimeter - Product Manual - Revision 11 © LightWare Optoelectronics (Pty) Ltd, 2016...
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Page 2: Table Of Contents
Information found in this document is used entirely at the reader’s own risk and whilst every effort has been made to ensure its validity neither LightWare Optoelectronics (Pty) Ltd nor its representatives make any warranties with respect the accuracy of the information contained herein. -
Page 3: Overview
USB port. The SF10 works by measuring the time it takes for a very short flash of laser light to travel to the ground and back again. The accuracy of the measurement is not affected by the colour or texture of the ground nor the angle of incidence of the laser beam. -
Page 4: Figure 2 :: Applications
The maximum operating altitude of the SF10 depends on the model: the SF10/A maximum range is 25 meters; the SF10/B maximum range is 50 meters; the SF10/C maximum range is 100 meters. Readings are updated 32 times per second in the SF10/A and SF10/B models, and updated 16 times per second in the SF10/C. -
Page 5: Quick Start Guide
8. Press the “Disconnect” icon before unplugging the USB cable. 9. There are several interface options available on the main connector. These connections are used to integrate the SF10 into your system and details of all the options are explained later in this document. -
Page 6: Making Connections To The Sf10
3. Making connections to the SF10 The SF10 gets power from either a regulated +5 V DC supply on the main connector or via the USB port when it is connected to a PC. There are a number of digital and analog interfaces on the main connector and either one or a combination of interfaces may be connected to a host controller. -
Page 7: Figure 6 :: Analog Voltage Connections
“slave” mode and uses 3.3 V logic levels. The I2C address can be set through the USB menu system. The host controller acts as the I2C “master” and sends the address to the SF10 as an 8 bit value (7 address bits plus 1 read bit). The SF10 then returns the altitude as a 16 bit integer. -
Page 8: Menu Options
-10.00 meter to +10.00 meters and this value is subtracted from the altitude reading before it is made available on any of the interfaces. The zero datum offset can be used to compensate for the mounting position of the SF10 in the airframe, where distance readings may best be interpreted from a suitable point on the landing gear, rather than from the front face of the SF10. -
Page 9: Figure 10 :: Altitude Represented By Distance (Serial / I2C) And Analog Voltage
Analog distance range (SF10/A: 1.00 m … 30.00 m, SF10/B: 1.00 m … 60.00 m & SF10/C: 1.00 m … 120.00 m) The distance at which the maximum analog output of 2.56 V occurs can be set by selecting menu item <e>. The output voltage can be converted back into a distance by using the formula: a = v / 2.56 * c... -
Page 10: Instructions For Safe Use
Make sure that the SF10 is switched OFF before looking into the lenses. The SF10 should be mounted using the four holes provided in the circuit board. Do not hold or clamp the lens tubes as this may cause damage and adversely affect the laser safety rating. -
Page 11: Appendix A :: Specifications
FDA accession number: FDA accession number: FDA accession number: 1630995-000 (2016/09) 1630995-000 (2016/09) 1630995-000 (2016/09) Appendix B :: Dimensions Figure 12 :: Dimension drawings of the SF10 SF10 Laser Altimeter - Product Manual - Revision 11 © LightWare Optoelectronics (Pty) Ltd, 2016... -
Page 12: Appendix C :: Main Cable Type 1, 35 Cm
SF10 Laser altimeter Product manual Appendix C :: Main cable type 1, 35 cm SF10 Laser Altimeter - Product Manual - Revision 11 © LightWare Optoelectronics (Pty) Ltd, 2016... -
Page 13: Appendix D :: Connecting To Pixhawk Autopilot Using "Serial 4
Appendix E :: Electromagnetic interference (EMI) graphs The SF10 family has been tested for radio frequency interference in accordance with MIL-STD-451C. The results are well within the required limits so that neither direct radiation nor secondary radiation from wiring should cause interference to on-board systems such as GPS and optical flow. - Page 14 SF10 Laser altimeter Product manual 2. 14 kHz to 1 GHz - broadband 3. 1 GHz to 10 GHz - narrowband SF10 Laser Altimeter - Product Manual - Revision 11 © LightWare Optoelectronics (Pty) Ltd, 2016...
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Page 15: Revision History
2014/11/19 Update product code references: “SF10/A” to “SF10/B (50 m)”; “SF10/B” to “SF10/C (100 m)” and “SF10/C” to “SF10/A (25 m)”. Update “2. Quick start guide” software menu item references for: “Ground offset” to “Zero datum offset”; “Altitude filter” to “Smooth output”;...