Irene I Li

7395189, Jul 1, 2008

Nov 14, 2006

11/600248

Xinlin Qing - Cupertino CA, US
Shawn J. Beard - Livermore CA, US
Zengpin Yu - Palo Alto CA, US
Irene Li - Stanford CA, US

Acellent Technologies, Inc. - Sunnyvale CA

G06F 11/30
G21C 17/00

702185, 702188

Use of a single line for switching multiple monitoring elements on/off, and a single line for sending signals to, or receiving signals from, those elements that are switched on. Monitoring elements each have an associated switching element, and each switching element is connected to a common switching line, or control line. A signal from the control line turns each switch on or off. Each monitoring element is also connected to a single signal line, and only those monitoring elements that are turned on can transmit/receive data signals along this signal line.

7430911, Oct 7, 2008

Aug 26, 2004

10/928788

Xinlin Qing - Cupertino CA, US
Chang Zhang - Santa Clara CA, US
Irene Li - Stanford CA, US

Acellent Technologies, Inc. - Sunnyvale CA

G01H 1/00

73587, 73658, 73602

A method for both detecting and analyzing a change in the loading condition of a structure. A flexible substrate is employed, in which a distributed network of sensors is built. This substrate is either affixed to the surface of the structure, or built within it, so as to be able to detect propagating stress waves. After load change is detected, the resulting sensor signals are analyzed to determine the location, severity, and/or any characteristic frequencies of the load change. This information is then used to determine an appropriate response.

7488015, Feb 10, 2009

Dec 22, 2004

11/017717

Yan Lu - Freising, DE
Xinlin Qing - Mountain View CA, US
Chang Zhang - Sunnyvale CA, US
Irene Jhi-Sue Li - Stanford CA, US

Bayerische Motoren Werke Aktiengesellschaft - Munich

B60R 21/0136
B60R 21/34

293117, 29618703, 29618704, 29618709

Systems and methods for pedestrian impact detection are provided. Piezoelectric sensor elements detect an object impacting a vehicle. The detected signal is attenuated and filtered. The attenuated and filtered signal is analyzed in the frequency domain to determine whether the object which impacted the vehicle is a pedestrian. If the object which impacted the vehicle is a pedestrian, then a pedestrian protection system is deployed.

7908095, Mar 15, 2011

Apr 14, 2008

12/102767

Paul B. Liu - Cupertino CA, US
Fu-Kuo Chang - Stanford CA, US
Shawn J. Beard - Livermore CA, US
Irene Li - Stanford CA, US

Acellent Technologies, Inc. - Sunnyvale CA

G06F 19/00

702 34

A method useful in structural health monitoring (SHM) systems for detecting damages in metal structures includes extracting the zero-order symmetric and anti-symmetric mode signal components from each of a plurality of current sensor signals of an array of transducers mounted on the structure, matching the extracted signal components with corresponding signal components of a plurality of baseline sensor signals previously detected in the structure, computing respective indices Iand Ifor each of the matched extracted current and baseline signal components based on respective signal energies thereof, and determining the presence of a damage in the structure if either of the indices Iand Iof a plurality of neighboring sensor paths of the structure is greater than a selected threshold value.

8229680, Jul 24, 2012

Apr 29, 2009

12/432659

Bao Liu - Cupertino CA, US
Lien Ouyang - Los Altos CA, US
Shawn J. Beard - Livermore CA, US
Irene Li - Stanford CA, US
Fu-Kuo Chang - Stanford CA, US

Acellent Technologies, Inc. - Sunnyvale CA

G01N 29/14

702 33, 702 56, 73 76, 324242, 324240, 324658

Methods and apparatuses for detecting fastener loosening. Sensors query a structure at a baseline value of an environment variable, such as temperature, and this baseline signal is stored for later use. Subsequently, users can query the structure remotely and at any time, and the signals from these queries are compared to the stored baseline signal. In some embodiments, an index is calculated, and the system determines that one or more fasteners have come loose if the calculated index exceeds a predetermined threshold value. It is desirable to select a time window within which the query signal is most sensitive to fastener loosening but least sensitive to variations in the environment variable. Accordingly, embodiments of the invention include methods and apparatuses for determining an optimal time window for use in calculating the above described index.

8244486, Aug 14, 2012

Apr 29, 2009

12/432668

Chang Zhang - Santa Clara CA, US
Xinlin Qing - Cupertino CA, US
Irene Li - Stanford CA, US

Acellent Technologies, Inc. - Sunnyvale CA

G06F 19/00

702 42, 702 33, 702 55, 73761, 73799, 324242, 324240, 324658

Storage of information, such as baseline information and structure ID, in a memory that is mounted on the structure, rather than inside the diagnosis hardware. This allows for faster and more convenient information retrieval. In particular, this approach allows for a more modular system in which different diagnosis hardware or other analyzers can be simply plugged into a structure's sensor network, whereupon they can quickly download any desired structure-specific information (e. g. , baseline information, structure ID, and other useful information) from the on-structure memory.

8265889, Sep 11, 2012

Aug 5, 2009

12/536429

Xinlin Qing - Cupertino CA, US
Chang Zhang - Santa Clara CA, US
Irene Li - Stanford CA, US
Fu-kuo Chang - Stanford CA, US
Hung Chi Chung - Santa Clara CA, US

Acellent Technologies, Inc. - Sunnyvale CA

G01R 31/307

702 58, 702 36, 702 39, 702183, 73579, 73583, 73628, 29600, 29825

A structural health monitoring system using ASICs for signal transmission, reception, and analysis. Incorporating structural health monitoring functionality into one or more ASICs provides a durable yet small, lightweight, low cost, and portable system that can be deployed and operated in field conditions. Such systems provide significant advantages, especially in applications such as armor structures.

8347722, Jan 8, 2013

Jan 22, 2009

12/358108

Xinlin Qing - Cupertino CA, US
Shawn J. Beard - Livermore CA, US
Irene Li - Stanford CA, US

Acellent Technologies, Inc. - Sunnyvale CA

G01N 29/14

73587, 73632

Sensors affixed to various such structures, where the sensors can withstand, remain affixed, and operate while undergoing both cryogenic temperatures and high vibrations. In particular, piezoelectric single crystal transducers are utilized, and these sensors are coupled to the structure via a low temperature, heat cured epoxy. This allows the transducers to monitor the structure while the engine is operating, even despite the harsh operating conditions. Aspects of the invention thus allow for real time monitoring and analysis of structures that operate in conditions that previously did not permit such analysis. A further aspect of the invention relates to use of piezoelectric single crystal transducers. In particular, use of such transducers allows the same elements to be used as both sensors and actuators.