Browsing by Author "Urey, H."
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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. ... -
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 ... -
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 ... -
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 ... -
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 ... -
Two cantilever based sytem for viscosity and density monitoring
Cakmak, O.; Ermek, E.; Kilinc, N.; Yaralıoğlu, Göksen Göksenin; Urey, H. (IEEE, 2015)Viscosity and density measurements in liquids in real-time is challenging. Previous MEMS based approaches use frequency sweeps for the purpose and those methods are slow and not real-time. We show that high precision ...
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