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Ultrasound Microscope with Arbitrary Coded Broadband High Frequency Signal

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dc.date.accessioned 2013-06-03T07:43:38Z und
dc.date.accessioned 2017-10-24T12:04:30Z
dc.date.available 2013-06-03T07:43:38Z und
dc.date.available 2017-10-24T12:04:30Z
dc.date.issued 2013-06-03T07:43:38Z
dc.identifier.uri http://radr.hulib.helsinki.fi/handle/10138.1/2797 und
dc.identifier.uri http://hdl.handle.net/10138.1/2797
dc.title Ultrasound Microscope with Arbitrary Coded Broadband High Frequency Signal en
ethesis.discipline Physics en
ethesis.discipline Fysiikka fi
ethesis.discipline Fysik sv
ethesis.discipline.URI http://data.hulib.helsinki.fi/id/3434818f-62d6-4ad2-9c9b-7a86be9cf8e6
ethesis.department.URI http://data.hulib.helsinki.fi/id/3acb09b1-e6a2-4faa-b677-1a1b03285b66
ethesis.department Institutionen för fysik sv
ethesis.department Department of Physics en
ethesis.department Fysiikan laitos fi
ethesis.faculty Matematisk-naturvetenskapliga fakulteten sv
ethesis.faculty Matemaattis-luonnontieteellinen tiedekunta fi
ethesis.faculty Faculty of Science en
ethesis.faculty.URI http://data.hulib.helsinki.fi/id/8d59209f-6614-4edd-9744-1ebdaf1d13ca
ethesis.university.URI http://data.hulib.helsinki.fi/id/50ae46d8-7ba9-4821-877c-c994c78b0d97
ethesis.university Helsingfors universitet sv
ethesis.university University of Helsinki en
ethesis.university Helsingin yliopisto fi
dct.creator Meriläinen, Antti Iisakki
dct.issued 2013
dct.language.ISO639-2 eng
dct.abstract Coded signals are widely used in ultrasound microscopy and they can improve signal to noise ratio and imaging quality. However, so far all reported solutions has limited bandwidth under 135 MHz. We present a solution for ultrasonic microscopy that is capable of dealing with coded GHz signals. The ultrasound microscope features a high frequency arbitrary signal source, a solid state switch, a microcontroller trigger device, and a preamplifier. Our signal source based on quadrature I-Q modulator modulates a high frequency signal with low frequency arbitrary signals and produces a high frequency arbitrary signal. This signal source gives more than 200 MHz bandwidth in center frequency range of 0.2 - 1 GHz that can be used for coded signals. For pulse echo operation we use commercial 3 GHz solid state switches that handle 15 Vpp signals and that are controlled by an Atmel microcontroller. The preamplifier is a custom built low noise preamplifier (3.3 dB noise figure) with broadband, 0.01 - 1.2 GHz. Originally the components was developed for wireless networking. We performed electric tests on our devices with several signals whose frequency range was 0.1 - 1.1 GHz. We also validated our device with a custom built ultrasound immersion microscope by imaging a 5 µm tall MEMS step structure using 100 - 300 MHz, 3 µs, 10.5 Vpp linear and non-linear chirp excitation. This device allows one to use high frequency coded signals and it advances the state-of-art of ultrasonic microscopy. en
dct.language en
ethesis.language.URI http://data.hulib.helsinki.fi/id/languages/eng
ethesis.language English en
ethesis.language englanti fi
ethesis.language engelska sv
ethesis.thesistype pro gradu-avhandlingar sv
ethesis.thesistype pro gradu -tutkielmat fi
ethesis.thesistype master's thesis en
ethesis.thesistype.URI http://data.hulib.helsinki.fi/id/thesistypes/mastersthesis
dct.identifier.urn URN:NBN:fi-fe2017112252446
dc.type.dcmitype Text

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