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Optical connection
Horák, Jaroslav ; Mišurec, Jiří (referee) ; Káňa, Ladislav (advisor)
Master's thesis treat of optical connection. The aim of this work was also the practical implementation and successful testing. Communications signal is low frequency in the range of 20 to 15 kHz and intended length of the coupling is approximately 200 m. The first is the work carried out theoretical analysis issues. Then is described the design and implementation of its own facility. In conclusion, the measurement is done and evaluate the parameters. I have dealt the optical connection with using a laser beam that is modulated frequency modulation. This optical signal is converted in the receiver using a PIN photodiode (type PIN) back to the electrical signal. Then there is the demodulation and amplification. The frequency modulator and demodulator is phase lock loop. It realizes the type of circuit CMOS 4046. The work is designed properly functioning equipment. It serves for the transmission of speech and audio signal line. It has good properties that match the criteria. The connection can be used outdoors due to the use of cover. The scope of communication may be even greater than 200 meters
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Design of measurement unit for analysis of surface materials properties
Kratochvíl, Robert ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
The thesis deals with the application of laser beams for examination of material properties. The properties being examined are quality of surface finish and transmissivity of materials in the optical portion of the electromagnetic spectrum. A measuring device containing laser diodes as a source of laser beam and photodiodes for evaluation of examined phenomena serves for examination of both properties. Conversion of the signal to digital quantity and its further processing take place in a microcontroller. The data is then sent via a serial bus and a converter to a computer, where it may be saved in a user program and where the user can work with them later. The thesis contains results of reflectivity measurement of a set of metal samples with different surface finish. Transmissivity measurement was applied on a set of optical filters.
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Solar Radiation Measurements
Chvátal, Michal ; Pikula, Stanislav (referee) ; Beneš, Petr (advisor)
The Bachelor‘s thesis discusses design and verification of an inexpensive method for indicative measurement of direct and diffused solar radiation. The reason for the measurement of solar radiation is the estimate the heat gain of buildings. In this paper the difference between thermoelectric generator and cooler is described. There is also described how to choose a suitable module for solar radiation measurement. The design of the measuring circuit and the construction of sensor are also described. Eventually the measured values are compared with the values from the commercial pyranometer SG420.
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Luxmeter
Vítek, Jiří ; Bereznanin, Martin (referee) ; Rozman, Jiří (advisor)
This bachelor thesis deals with a method of measuring working illumination and with a design of basic luxmeter, which has a range of measurment 50-1000 lx. The thesis contains a detailed description of individual detectors, a design of luxmeter connection and also includes a description of individual functional blocks. For the whole apparature is performed a suggestion of the printed circuit boards.
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Program for the free space optical link power budged calculation
Vaculík, Jakub ; Hudcová, Lucie (referee) ; Křivák, Petr (advisor)
With increasing demands for transit capacity of data networks as well as communication network optical networks seem to be the suitable solution. Light beam is attractive to use for data transmission . Transmitted data can be expressed by means of light impuls.. For execution of the project we need the whole optical telecommunical system which consists of transmitter, transmission link and receiver. The target of transmission link is to transfer optical beam from its resourse to detector with minimal losses. The optical fibre or optical freespace optical link FSO are used for this purpose. Connection to internet by optical fibre is out of reach for most households and plants, it is very expensive and so far it isn´t in the offer of network operators and service providers. (at lest in our condition). But there is still the posibility to obviate optical fibre networks and reach high permeability and safety of communication by means of freespace optical links. It is much easier to implement, but only for short distance. FSO enables quick and even ecological communication which is in the world of more famous radio frequency networks very pleasant message.
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Measurement of Operational Parameters of Light Sources
Motyčka, Martin ; Pavelka, Tomáš (referee) ; Krbal, Michal (advisor)
This semestral thesis is focused on description of operating parameters of light sources and their measurements. There are descripted light-technical, electrical and other parameters of light sources and methods of their measurements and evaluations. In tables there are ranges of fotometric quantities for most types of light sources. This thesis is also focused on functional explanation of photometric measuring instruments.
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Optical Fiber Output Power Temperature Sensor Measuring Optimization
Koláčková, Aneta ; Grenar, David (referee) ; Filka, Miloslav (advisor)
This bachelor thesis deals with the issue of measuring optic power on the output of single mode fiber, used like temperature sensor, using birefringent. Thesis describes the basic knowledge about measuring power, standards and function of optical power meters. It also deals with polarization and representation polarization states using the Poincare sphere. In the practical portion is measured optic power on the output of the temperature sensor with a photodiod and after that is verifed by a polarimeter. The aim of this thesis is miniaturization of ending device for measuring intensity of light, that means replacing expensive and large polarimeter by cheap and small photodiod.
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Optical detection of electrograms
Hanák, Pavel ; Kozumplík, Jiří (referee) ; Chmelař, Milan (advisor)
The aim of the study was focused on problem of electrograms recording with using voltage sensitive dyes. Study of electrograms recording was extended with thema of optical detectors suitable for measurement and noise analysis. Elimination of noise and disturption was made in program Matlab; lowpass filtration and wavelet transformation was used. Application for electrograms analysis was developed in latter part of this work.
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Low-range high-speed optical transceiver
Pučálka, Jan ; Tošovský, Petr (referee) ; Kubíček, Michal (advisor)
The diploma thesis deals with description and design of a low-cost free-space optical (FSO) link. First, general FSO theory is discussed including their common parameters, properties and topologies. Further, optical signal sources and detectors are proposed. Finally, the selected implementation is described including its design and realization. The proposed FSO consists of two identical segments (modules) to form a full-duplex link. The FSO utilizes LED as a light source, maximum speed data rate is 100 Mb/s with 100Base-TX interface.
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Design of EMC optical converter
Štěpánek, Adam ; Hruboš, Zdeněk (referee) ; Krutílek, David (advisor)
Master's thesis is focused on designing optical converter for EMC measurement transfering signal through noisy enviroment. First part contains analysis of electromagnetic interference and its coupling and measurement, especially types of probes for interference maesurement. Next part passing through designing of optoelectric and electrooptic converter with digital intensity modulation. Last part is about realization of optical converter.
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