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Data communication and power supply on a two conductor systemAndersson, Tobias, Toft, Jonathan January 2018 (has links)
This master thesis aimed to develop a prototype of a hardware platform which allowed digital communication as well as DC power to be transmitted over one pair of wires. The prototype was used as a pre-study for Axis Communications AB that wanted a bit rate high enough to transmit digital audio, as well as enough power to supply a set of speakers. The prototype included one circuit to send power and data (master), as well as two receivers (slaves). With this configuration data rates of up to 17 Mbps were achieved as well as an output power of 90 W from master. The data was transmitted on a RS-485 bus type, which was AC coupled to a 48 V DC bias. Because of the AC coupling, the bit stream needed to alternate, therefore Manchester encoded data, or similar, was recommended. The receiver cards included a buck converter to supply the circuits with a stable 5 V DC. The converters needed at least 10 V supply voltage to function, which gave a theoretical max range in cabling when accounting for voltage drop in the cables. For a 0.75 mm² power cord at max allowed current, this range was 500 metres per wire.
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Development and calibration of two and four wire water surface wave height measurement systems.Yarber, Robert K. 12 1900 (has links)
Approved for public release; distribution is unlimited / Capacitance and conductance measurements using two and
four wire techniques were developed and statically and
dynamically calibrated in this thesis. The voltage
sensitivities range from 7.3 to 8.1 ± 0.1 mV/cm for the two
wire capacitance system static calibrations. This is ± 5.2%
of the limiting theoretical value. The voltage sensitivities
range from 0.3 to 0.4 ± 0.1 V/cm for the four wire
conductance system static calibrations. Dynamic calibrations
were only completed for the conductance system. The dynamic
calibration results were weakly frequency dependent with a
qj-0.15 decay in a limited, 2-4 Hz range. Wind power spectrum measurements were taken in the
existing Upper Ocean Simulations Facility at the Naval
Postgraduate School. There was excellent agreement in the
spectra with both techniques.
Driven gravity wave frequency downshifting and wind
energy dumping was observed in the combined gravity wave and
wind-wave measurements. The power spectra peaked near two
Hertz and decayed at 50 to 70 dB per decade, or as CO
-5 to
G)" 7 for both systems. Gravity wave phase speed and wavelength measurements
were performed with the capacitance system. The results were
approximately 40% higher than theory. / http://archive.org/details/developmentcalib00yarb
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Two-wire, low component count soil temperature sensorSitter, Nicholas James 01 May 2011 (has links)
A two-wire, low component count soil temperature sensor was developed. The sensor uses one wire for ground and the other wire is used for both power and communication. Pulse width modulation is used to send temperature measurements to the master, where the duty cycle is proportional to the temperature. The sensor parasitically powers itself from the bidirectional data line. In order to reduce the number of components necessary, a microcontroller with an internal temperature sensor is used. Finally, the sensor can receive data from the master on the bidirectional communication line, which is used for calibrating the sensor.
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