Browsing Faculty of Engineering by OzU Authors "Yaralıoğlu, Göksen Göksenin"
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Analysis of vibratory gyroscopes: drive and sense mode resonance shift by coriolis force
Cetin, Hakan; Yaralıoğlu, Göksen Göksenin (IEEE, 2017)In this paper, we demonstrate the analysis of coupling between drive and sense systems of vibratory gyroscopes. Vibratory gyroscopes have attracted a lot of interest recently with the development of MEMS gyroscopes. These ... -
Blood clotting time measurement using a miniaturized high-frequency ultrasound sensor
Sobhani, M. R.; Majidi, Negar; Yaralıoğlu, Göksen Göksenin (IEEE, 2023)This paper demonstrates a novel blood coagulation time measurement methodology that requires as low as 1 microliter of whole blood. The blood sample is placed on the top surface of a fused quartz plate where an ultrasonic ... -
Blood coagulation time measurement using a 1μL of whole blood on a TE mode BAW resonator
Majidi, Negar; Sobhani, M. R.; Yaralıoğlu, Göksen Göksenin (IEEE, 2018-12-20)This paper presents a possible way to blood coagulation time measurement using a TE (Thickness Extensions) mode BAW (Bulk Acoustic Wave) resonator which requires as low as 1 micro-liter of whole blood. The blood sample is ... -
Cantilever array oscillators with nonlinear optical readout
Lüleç, S. Z.; Adiyan, U.; Yaralıoğlu, Göksen Göksenin; Leblebici, Y.; Urey, H. (IEEE, 2015)MEMS array oscillators typically require a separate detector and feedback loop for each oscillator. We show that grating-based-optical-readout induces nonlinearity, which enables simultaneous operation of an array-of-oscillators ... -
A cartridge based sensor array platform for multiple coagulation measurements from plasma
Cakmak, O.; Ermek, E.; Kilinc, N.; Bulut, S.; Baris, I.; Kavakli, I. H.; Yaralıoğlu, Göksen Göksenin; Urey, H. (Royal Society of Chemistry, 2015)This paper proposes a MEMS-based sensor array enabling multiple clot-time tests for plasma in one disposable microfluidic cartridge. The versatile LoC (Lab-on-Chip) platform technology is demonstrated here for real-time ... -
Coagulation measurement from whole blood using vibrating optical fiber in a disposable cartridge
Yaraş, Y. S.; Gündüz, A. B.; Sağlam, G.; Ölçer, S.; Civitçi, F.; Baris, İ.; Yaralıoğlu, Göksen Göksenin; Urey, H. (SPIE, 2017-11)In clinics, blood coagulation time measurements are performed using mechanical measurements with blood plasma. Such measurements are challenging to do in a lab-on-a-chip (LoC) system using a small volume of whole blood. ... -
Coriolis Effect on elastic waves propagating in rods
Çetin, Hakan; Yaralıoğlu, Göksen Göksenin (Elsevier, 2020-10-27)Vibration analysis of rods that are subjected to rotation is presented. It is shown that flexural-flexural, longitudinal-flexural and torsional-flexural wave coupling occur due to the Coriolis Effect. First, we carried out ... -
Design of a quad element patch antenna at 5.8 GHz
Majidi, Negar; Yaralıoğlu, Göksen Göksenin; Sobhani, M. R.; Imeci, T. (IEEE, 2018)This paper presents simulation and experimental verification of a quad microstrip patch antenna that operates at 5.8 GHz. Sonnet antenna design software was used to simulate the performance of the antenna. To reduce the ... -
Disposable cartridge biosensor platform for portable diagnostics
Yaras, Y. S.; Cakmak, O.; Gunduz, A. B.; Saglam, G.; Olcer, S.; Mostafazadeh, A.; Baris, I.; Civitci, F.; Yaralıoğlu, Göksen Göksenin; Urey, H. (SPIE , 2017)We developed two types of cantilever-based biosensors for portable diagnostics applications. One sensor is based on MEMS cantilever chip mounted in a microfluidic channel and the other sensor is based on a movable optical ... -
Equivalent circuit for capacitive micromachined ultrasonic transducers to predict anti-resonances
Kemal, Remzi Erkan; Bozkurt, A.; Yaralıoğlu, Göksen Göksenin (Springer Nature, 2020-12)Equivalent circuit models have been long used to evaluate the dynamics of the capacitive micromachined ultrasonic transducer (CMUT). An important parameter in the characterization of a CMUT is the anti-resonance frequency, ... -
LoC sensor array platform for real-time coagulation measurements
Cakmak, O.; Kılınç, N.; Ermek, E.; Mostafazadeh, A.; Elbuken, Ç.; Yaralıoğlu, Göksen Göksenin; Urey, H. (IEEE, 2014)This paper reports a MEMS-based sensor array enabling multiple clot-time tests in one disposable microfluidic cartridge using plasma. The versatile LoC (Lab-on-Chip) platform technology is demonstrated here for real-time ... -
MEMS based blood plasma viscosity sensor without electrical connections
Çakmak, O.; Ermek, E.; Urey, H.; Yaralıoğlu, Göksen Göksenin; Kılınç, N. (IEEE, 2013)A MEMS based viscometer is reported. The device has a disposable cartridge and a reader. The cartridge contains microfluidic channels and a MEMS cantilever sensor. The reader contains the actuator and the readout optics ... -
MEMS cantilever sensor array oscillators: Theory and experiments
Lulec, S. Z.; Adiyan, U.; Yaralıoğlu, Göksen Göksenin; Leblebici, Y.; Urey, H. (Elsevier, 2016-01-01)This paper demonstrates that an array of cantilever sensors can be operated simultaneously at resonance using a single actuator and a single photodetector. Self-sustained oscillations (SSOs) of cantilevers can be achieved ... -
Microcantilever based LoC system for coagulation measurements
Çakmak, O.; Ermek, E.; Kılınç, N.; Barış, I.; Kavaklı, I. H.; Yaralıoğlu, Göksen Göksenin; Urey, H. (Chemical and Biological Microsystems Society, 2014)In this paper, a microcantilever-based system enabling multiple coagulation tests on the same disposable cartridge is demonstrated. The system consists of independent cartridge and reader unit. The actuation of the nickel ... -
Mutual radiation impedance of circular CMUTs on a cylinder
Zangabad, R. P.; Bozkurt, A.; Yaralıoğlu, Göksen Göksenin; Bosch, J. G.; Soest, G. van; Steen, A. F. W. van der (IEEE, 2016)In ultrasound imaging, cross coupling of transducer elements through the medium has significant effect on the frequency response, thus affecting the quality of the ultrasound image. In Side-Looking Intravascular Ultrasound ... -
Noise analysis of mode matched vibratory gyroscopes
Çetin, Hakan; Yaralıoğlu, Göksen Göksenin (Springer, 2023-01)MEMS (micro-electromechanical system) vibratory gyroscopes have attracted a lot of interest recently and these gyroscopes made their way through portable devices and smart phones. However, their performance is not enough ... -
Optical fiber array based simultaneous parallel monitoring of resonant cantilever sensors in liquid
Mostafazadeh, A.; Yaralıoğlu, Göksen Göksenin; Urey, H. (Elsevier, 2016-05-01)This paper reports a novel method for simultaneous resonance monitoring of MEMS cantilevers using phase based dynamic measurements without any electrical connections to the sensor array. MEMS cantilevers are made of ... -
Portable low cost ultrasound imaging system
Sobhani, Mohammad Rahim; Ozum, H. E.; Yaralıoğlu, Göksen Göksenin; Ergun, A. S.; Bozkurt, A. (IEEE, 2016)The applications of ultrasound in medicine have been increasing in the last decade either in diagnostics or in treatments. Ultrasound is routinely used in clinical examinations, such as pregnancy exams. On the other hand, ... -
Precision density and viscosity measurement using two cantilevers with different widths
Cakmak, O.; Ermek, E.; Kilinc, N.; Yaralıoğlu, Göksen Göksenin; Urey, H. (Elsevier, 2015)We introduce a novel method for fast measurement of liquid viscosity and density using two cantilevers with different geometries. Our method can be used for real-time monitoring in lab on chip systems and offer high accuracy ... -
A prism-based non-linear optical readout method for MEMS cantilever arrays
Adiyan, U.; Civitci, F.; Yaralıoğlu, Göksen Göksenin; Urey, H. (Elsevier, 2016-10-15)This paper demonstrates the use of a single right-angle prism for the optical readout of micro-electro-mechanical systems (MEMS) cantilever arrays. The non-linear reflectivity arisen from the internal reflection at the ...
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