Self-oscillation loop design and measurement for an MEMS resonant accelerometer

2012 ◽  
pp. n/a-n/a
Author(s):  
Liu Heng ◽  
Meng Rui Li
Keyword(s):  
Loop Design ◽  
Oscillation Loop ◽  
Resonant Accelerometer

Design and performance test of an oscillation loop for a MEMS resonant accelerometer

2003 ◽  
Vol 13 (2) ◽  
pp. 246-253 ◽  
Author(s):  
Sangkyung Sung ◽  
Jang Gyu Lee ◽  
Byeungleul Lee ◽  
Taesam Kang
Keyword(s):  
Performance Test ◽  
Oscillation Loop ◽  
And Performance ◽  
Resonant Accelerometer

Oscillation Loop for a Resonant Type MEMS Accelerometer and Its Performance under Noisy Condition

2006 ◽  
Vol 326-328 ◽  
pp. 1495-1498 ◽  
Author(s):  
Chul Hyun ◽  
Jang Gyu Lee ◽  
Tae Sam Kang
Keyword(s):  
Nonlinear Dynamic System ◽  
Experimental Result ◽  
Sustained Oscillation ◽  
Actual System ◽  
Noise Sources ◽  
Mems Accelerometer ◽  
Oscillation Loop ◽  
Resonant Accelerometer ◽  
Noisy Condition

This paper presents an oscillation loop for an INS (Inertial Navigation System) grade, surface micro-machined resonant type accelerometer. This resonant type sensor utilizes the electrostatic stiffness changing effect of an electrostatic actuator. This device produces a frequency output upon an applied acceleration. A closed loop system called self-sustained oscillation loop is prerequisite for its operation as a resonant accelerometer. A self-sustained oscillation loop induces the system’s dynamic states into its primary mode, thus keeps track of its resonant state under applied acceleration or perturbation. For this, a simple self-sustained oscillation loop is designed and the feature of the loop is analyzed in the viewpoint of nonlinear dynamic system. From the standpoint of feedback control system, both determination of resonance point and its stability analysis are required. In the actual system, which has several noise sources, noise can affect the output resonant frequency. We analyzed the effect of a noise on oscillation frequency. Finally, simulation and experimental result is given

Development of an Oscillation Loop for a Micromachined Differential Type Resonant Accelerometer and Its Performance

2006 ◽  
Vol 306-308 ◽  
pp. 1253-1258
Author(s):  
Chul Hyun ◽  
Jang Gyu Lee ◽  
Tae Sam Kang
Keyword(s):  
Sustained Oscillation ◽  
Performance Tests ◽  
Describing Function ◽  
Output Frequency ◽  
Sensor Performance ◽  
Frequency Responses ◽  
Oscillation Loop ◽  
Differential Type ◽  
Analytical Result ◽  
Resonant Accelerometer

This paper presents a surface micro-machined differential resonant accelerometer (DRXL) by using the epitaxially grown thick polysilicon process. The proposed DRXL utilizes the electrostatic stiffness changing effect of an electrostatic torsional actuator. This device produces a differential digital output proportional to an applied acceleration. For a self-generated and self-sustained oscillation of the resonator, a feedback oscillation loop is designed, implemented, and applied to the DRXL chip. The oscillation loop is designed using an analytical result based on the describing function method. Using the implemented self-sustaining oscillation loop, pecifications of sensor performance are obtained by various performance tests. These results show quite an improved quality factor and resolution compared to that of the sensing device only. And we obtained more stable output frequency responses.

The Artificial Pancreas in Cyborg Bodies

2020 ◽  
pp. 412-430
Author(s):  
Anthony Ryan Hatch ◽  
Julia T. Gordon ◽  
Sonya R. Sternlieb
Keyword(s):  
Glucose Sensor ◽  
Social Inequalities ◽  
Infusion Pump ◽  
Artificial Pancreas ◽  
Small Scale ◽  
Glucose Levels ◽  
Loop Design ◽  
Access To Health ◽  
Do It Yourself ◽  
And Control

The new artificial pancreas system includes a body-attached blood glucose sensor that tracks glucose levels, a worn insulin infusion pump that communicates with the sensor, and features new software that integrates the two systems. The artificial pancreas is purportedly revolutionary because of its closed-loop design, which means that the machine can give insulin without direct patient intervention. It can read a blood sugar and administer insulin based on an algorithm. But, the hardware for the corporate artificial pancreas is expensive and its software code is closed-access. Yet, well-educated, tech-savvy diabetics have been fashioning their own fully automated do-it-yourself (DIY) artificial pancreases for years, relying on small-scale manufacturing, open-source software, and inventive repurposing of corporate hardware. In this chapter, we trace the corporate and DIY artificial pancreases as they grapple with issues of design and accessibility in a content where not everyone can become a diabetic cyborg. The corporate artificial pancreas offers the cyborg low levels of agency and no ownership and control over his or her own data; it also requires access to health insurance in order to procure and use the technology. The DIY artificial pancreas offers patients a more robust of agency but also requires high levels of intellectual capital to hack the devices and make the system work safely. We argue that efforts to increase agency, radically democratize biotechnology, and expand information ownership in the DIY movement are characterized by ideologies and social inequalities that also define corporate pathways.

Sign in / Sign up

Export Citation Format

Share Document