Browsing by Author "Wu, Sung-Yueh"

Now showing 1 - 10 of 10

3D PRINTED RF PASSIVE COMPONENTS BY LIQUID METAL FILLING
(2015)
Yang, Chen
;
Wu, Sung-Yueh
;
Glick, Casey
;
Choi, Yun Seok
;
Hsu, Wensyang
We present three-dimensional (3D) micro-scale electrical components and systems by means of 3D printing and a liquid-metal-filling technique. The 3D supporting polymer structures with hollow channels and cavities are fabricated from inkjet printing. Liquid metals made of silver particles suspension in this demonstration are then injected into the hollow paths and solidified to form metallic elements and interconnects with high electrical conductivity. In the proof-of-concept demonstrations, various radio-frequency (RF) passive components, including 3D-shaped inductors, capacitors and resistors are fabricated and characterized. High-Q inductors and capacitors up to 1 GHz have been demonstrated. This work establishes an innovative way to construct arbitrary 3D electrical systems with efficient and labor-saving processes.
3D-printed microelectronics for integrated circuitry and passive wireless sensors
(2015-01-01)
Wu, Sung-Yueh
;
Yang, Chen
;
Hsu, Wensyang
;
Lin, Liwei
;
機械工程學系
Three-dimensional (3D) additive manufacturing techniques have been utilized to make 3D electrical components, such as resistors, capacitors, and inductors, as well as circuits and passive wireless sensors. Using the fused deposition modeling technology and a multiple-nozzle system with a printing resolution of 30 mu m, 3D structures with both supporting and sacrificial structures are constructed. After removing the sacrificial materials, suspensions with silver particles are injected subsequently solidified to form metallic elements/interconnects. The prototype results show good characteristics of fabricated 3D microelectronics components, including an inductor-capacitor-resonant tank circuitry with a resonance frequency at 0.53 GHz. A 3D "smart cap" with an embedded inductor-capacitor tank as the wireless passive sensor was demonstrated to monitor the quality of liquid food (e.g., milk and juice) wirelessly. The result shows a 4.3% resonance frequency shift from milk stored in the room temperature environment for 36 h. This work establishes an innovative approach to construct arbitrary 3D systems with embedded electrical structures as integrated circuitry for various applications, including the demonstrated passive wireless sensors.
A Novel Guiding Device for Distal Locking of Intramedullary Nails
(2012)
Lee, Meng-Shiue
;
Wu, Sung-Yueh
;
Wong, Tze-Hong
;
Hsu, Wensyang
;
Chung, Tien-Kan
This paper presents the prototype of a new remote guiding device to find the accurate screw hole position for drilling and direction for locking in intramedullary nailing surgery. The device consists of three magnetic pins and an electrical conductive board. The three symmetrically placed magnetic pins can rotate freely and point to the permanent magnet inside the nail. The drilling position and screwing direction can be obtained by moving the device with those magnetic pins to align with the magnet in the nail. The alignment condition is indicated by a LED. When the device is not aligned with the magnet in the nail properly, either in position or direction, the pins then will contact with the board to trigger a light-emitting diode for alarming.
A Resettable, Wireless and Passive Fall-Down Recorder Using a Magnetic Droplet With an LC Circuit
(2016-02-01)
Huang, Cheng-Yeh
;
Sun, Peng
;
Lee, Meng-Shiue
;
Wu, Sung-Yueh
;
Shieh, Yi-Chueh
A fall-down recorder can record the happening of an object falling down during object delivery or transportation, even after the object is recovered to its initial state. Here, a resettable, wireless and passive fall-down recorder is proposed by integrating a droplet-based inertial force switch with the inductor-capacitor (LC) circuit for wireless signal transmission. A magnetic droplet is used in the switch with a converging microchannel to control the desired threshold acceleration. When the inertial force exceeds the designed threshold acceleration, the magnetic droplet will pass through the converging microchannel to a deep cavity to become a different state. By connecting the switch with the sensing LC circuit, the state of the recorder can be wirelessly identified through the LC resonant frequency. After triggering, this switch can be remotely reset to its initial state by an external magnet. A proper hydrophobic surface treatment is employed to facilitate the movement of the magnetic droplet and reduce the variation on the threshold acceleration. The capabilities, including switching, recording, wireless reading, and resetting of the proposed fall-down recorder, are successfully designed, fabricated, and verified with ten recording-reset tests.
A wirelessly readable and resettable shock recorder through the integration of LC circuits and MEMS devices
(2014-09-01)
Wu, Sung-Yueh
;
Hung, Chen-Yuan
;
Hsu, Wensyang
;
機械工程學系
;
Department of Mechanical Engineering
This paper presents a passive shock recorder to record shock events for tens of Gs with wireless reading and wireless resetting capabilities through the integration of LC circuits and two MEMS devices. With a micro mechanical-latch shock switch electrically connected to the sensing LC circuit, the shock event that leads to different latching states can be recorded and wirelessly read through the LC resonant frequency. With a micro electro-thermal actuator electrically connected to a wirelessly powered actuating LC circuit, the energy can be wirelessly sent to the micro actuator to provide the necessary unlatched force. By integrating the mechanical-latch shock switch and actuator with LC circuits, the latching state can be reset through the wireless actuation. Therefore, the shock recorder can be used repeatedly. Here, the mechanical-latch shock switch is designed to have a two-level shock recording capability. The fabrication of the shock switch and actuator are achieved by a Ni-based surface micromachining process. When the acceleration reaches 28.06 G, the latching state changes from the original state to the first latching state. The resonant frequency of sensing for the LC circuit is found to switch from 10.14 MHz to 9.16 MHz, correspondingly. By further applying acceleration up to 37.10 G, the latching state changes from the first latching state to the second state, and the resonant frequency shifts to 7.83 MHz. Then, with a current of 2.07 A(AC) wirelessly induced in the actuating LC circuit, the micro electro-thermal actuator is shown to provide sufficient displacement to reset the shock switch from a latched state back to the original unlatched state, and the resonant frequency is switched back to 10.14 MHz. The fabricated shock recorder is repeatedly tested five times. The wireless reading, resetting and shock recording capabilities are successfully verified.
Design and characterization of LC strain sensors with novel inductor for sensitivity enhancement
(2013-10-01)
Wu, Sung-Yueh
;
Hsu, Wensyang
;
機械工程學系
;
Department of Mechanical Engineering
This paper presents a LC strain sensor with a novel encapsulated serpentine helical inductor. The helical coil of the inductor is formed by serpentine wire to reduce the radial rigidity. Also the inductor is encapsulated by material with high Poisson's ratio. When an axial deformation is applied to this encapsulated inductor, the cross-sectional area of the helical coil will have more evident change due to lower radial rigidity and encapsulation. Therefore, the variation of inductance or LC resonant frequency can be enhanced to provide better sensitivity of the LC strain sensor. By using PDMS as encapsulated material, it is shown that the sensitivity of the conventional helical inductor with or without encapsulation are both about 73.0 kHz/0.01 epsilon, which means that encapsulation on the conventional helical inductor does not help to improve the sensitivity due to high radial rigidity of the conventional helical coil. It is also found that the encapsulated serpentine helical inductor has better sensitivity (121.9 kHz/0.01 epsilon) than the serpentine helical inductor without encapsulation (62.7 kHz/0.01 epsilon), which verifies the sensitivity enhancing capability of the proposed encapsulated serpentine helical inductor design. The error between simulation and measurement results on sensitivity of LC strain sensor with the encapsulated serpentine inductor is about 5.57%, which verifies the accuracy of the simulation model. The wireless sensing capability is also successfully demonstrated.
Novel Passive Two-Stage Magnetic Targeting Devices for Distal Locking of Interlocking Nails
(2017-01-01)
Wong, Tze-Hong
;
Lee, Meng-Shiue
;
Wu, Sung-Yueh
;
Hsu, Wensyang
;
Chung, Tien-Kan
Interlocking nailing is a common surgical operation to stabilize fractures in long bones. One of the difficult parts of the surgery is how to locate the position and direction of a screw hole on the interlocking nail, which is invisible to the naked eye after insertion of the nail into the medullary canal. Here, we propose a novel two-stage targeting process using two passive magnetic devices to locate the position and direction of the screw hole without radiation for the locking screw procedure. This involves a ring-shape positioning magnet inside the nail to generate a magnetic field for targeting. From the accuracy test results of these two-stage targeting devices, the search region can be identified in less than 20 seconds by the 1st-stage targeting device, while the total targeting time to locate the drilling position and direction takes less than 4 minutes, with 100% successful rate in 50 attempts. The drilling test further combines the two-stage targeting process and drilling process on the swine tibia, and it is shown that a 100% successful rate is achieved in all 10 attempts, where the total time needed is less than 5 minutes.
RF WIRELESS LC TANK SENSORS FABRICATED BY 3D ADDITIVE MANUFACTURING
(2015)
Wu, Sung-Yueh
;
Yang, Chen
;
Hsu, Wensyang
;
Lin, Liwei
;
交大名義發表
We present wireless inductor-capacitor (LC) tank sensors constructed by the three-dimensional (3D) additive manufacturing technique. Fabricated 3D structures with hollow channels are filled with liquid metal (silver particles) to form basic electrical components including inductors and capacitors. In the prototype design, a radio-frequency (RF) LC tank with resonance frequency at 0.53 GHz is realized. This LC tank sensor is utilized in rapid detection of liquid food (e.g., milk and juice). Specifically, the resonant frequency of the LC tank changes as the dielectric constant of the liquid food deteriorates over time and the signals are detected via an inductively coupled reader wirelessly. In the preliminary tests, a 4.3% frequency shift for milk stored at room temperature after 36 hours was obtained. This work presents a new class of manufacturing concepts to construct arbitrary 3D electrical systems for wireless sensing applications.
Sensitivity Enhancement of LC Sensors with Novel Inductor Design
(2011)
Wu, Sung-Yueh
;
Hsu, Wensyang
;
機械工程學系
;
Department of Mechanical Engineering
This paper presents a new LC strain sensor device with an encapsulated serpentine helical inductor. The helical coils of the inductor are formed by serpentine wires to reduce the radial rigidity. Also the inductor is encapsulated by material with high Poisson's ratio. When an axial deformation is applied to this encapsulated inductor, the cross-sectional area of the helical coils will have more evident change due to low radial rigidity and encapsulating material. Therefore, the change of inductance or LC resonant frequency can be enhanced to provide better sensitivity of the LC strain sensor, which are verified by simulated and measured results.
Wireless EWOD/DEP chips powered and controlled through LC circuits and frequency modulation
(2014-08-21)
Wu, Sung-Yueh
;
Hsu, Wensyang
;
機械工程學系
;
Department of Mechanical Engineering
This paper presents novel wireless EWOD/DEP chips that are wirelessly powered and controlled through LC circuits with one-to-many transmitter-receiver coupling. Each receiving LC circuit connected to the EWOD/DEP electrode is designed to have a different resonant frequency. When the input frequency is close to one of the resonant frequencies of receiving LC circuits, the induced voltage on the corresponding EWOD/DEP electrode will increase due to the resonance. Therefore, electrodes can be selectively and sequentially activated to provide sufficient EWOD or DEP force to manipulate the droplet or liquid by modulating the input frequency. Unlike previously reported wireless EWOD or DEP devices powered through one-to-one transmitter-receiver coupling, the transmitting inductor in the one-to-many transmitter-receiver coupling design proposed here is much larger than the total sizes of receiving inductors. Therefore, receiving inductors can be easily covered and coupled by the transmitting inductor. Here, droplet transport, splitting, and merging are successfully demonstrated using 5 receiving LC circuits at different input frequencies (1210-1920 Hz). Liquid pumping with multiple electrodes by wireless DEP is also demonstrated using 5 receiving LC circuits at higher input frequencies (51.2-76.1 kHz). Furthermore, liquid pumping with a continuous meandered electrode by wireless DEP is demonstrated through the resonant frequency shifting effect. It shows that the liquid pumping distance on a continuous electrode also can be tuned by proper frequency modulation.