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<p>Laser vibration sensing can be used to classify military targets by its unique vibration signature. A coherent laser radar receives the target´s rapidly oscillating surface vibrations and by using proper demodulation and Doppler technique, stationary, radially moving and even accelerating targets can be taken care of. </p><p>A frequency demodulation method developed at the former FOA, is for the first time validated against real data with turbulence, scattering, rain etc. The issue is to find a robust and reliable system for target recognition and its performance is therefore compared with some frequency distribution methods. The time frequency distributions have got a crucial drawback, they are affected by interference between the frequency and amplitude modulated multicomponent signals. The system requirements are believed to be fulfilled by combining the FOA method with the new statistical method proposed here, the combination being suggested as aimpoint for future investigations.</p>

Laser vibration sensing can be used to classify military targets by its unique vibration signature. A coherent laser radar receives the target´s rapidly oscillating surface vibrations and by using proper demodulation and Doppler technique, stationary, radially moving and even accelerating targets can be taken care of. A frequency demodulation method developed at the former FOA, is for the first time validated against real data with turbulence, scattering, rain etc. The issue is to find a robust and reliable system for target recognition and its performance is therefore compared with some frequency distribution methods. The time frequency distributions have got a crucial drawback, they are affected by interference between the frequency and amplitude modulated multicomponent signals. The system requirements are believed to be fulfilled by combining the FOA method with the new statistical method proposed here, the combination being suggested as aimpoint for future investigations.

Introduktion: Blodtryck är en livsviktig funktion som bidrar till syretillförseln till kroppens olika organ. Blodtryck går att mäta och är en viktig indikation på det kardiovaskulära systemets funktion. Det finns olika metoder att mäta blodtryck, bland annat auskultatoriskt, automatiskt och med hjälp av Dopplerteknik. Syftet var att jämföra de tre olika metoderna för att se om det förelåg en signifikant skillnad mellan metoderna.   Material och metod: Studien bestod av 30 deltagare. Studiedeltagaren vilade i tio minuter före första blodtrycksmätningen, därefter mättes deras blodtryck i en slumpad ordning med auskultatorisk, automatisk och med Dopplermetod. För att kontrollera om det förelåg en statistisk signifikant skillnad användes en variansanalys (ANOVA) och ett parat t-test.   Resultat och slutats: Det förelåg ingen signifikant skillnad mellan de systoliska blodtrycken. Däremot mellan de diastoliska trycken registrerat med den auskultatoriska och automatiska metoden förelåg det en signifikant skillnad, men den anses inte ha en klinisk betydelse. / Introduction: Blood pressure is a vital function that contributes to the supply of oxygen to the body’s various organs. Blood pressure can be measured and is an important indicator of the cardiovascular system function. There are different methods to measure blood pressure, these are, for example auscultatory, automatic and with the help of a Doppler technique. The aim was to compare the three different methods and see if there was a significant difference between them.   Material and method: The study consisted of 30 participants. The participant rested for ten minutes before the first examination and then their blood pressure was measured in a random order by the three methods: auscultatory, automatic and the Doppler method. To process the collected data an analysis of variance test (ANOVA) and a paired t-test were used.   Results and conclusion: There were no significant difference between the systolic blood pressures. In contrast, there was a difference between the diastolic blood pressures registered with the auscultatory and automatic methods, but this was not considered to be of clinical significance.

名古屋大学博士学位論文 学位の種類 : 博士(医学)(論文) 学位授与年月日:平成4年7月20日 淺田義正氏の博士論文として提出された