Min Chen

US Patent:

6448545, Sep 10, 2002

Filed:

Jan 18, 2000

Appl. No.:

09/483005

Inventors:

Min Chen - Brookline MA

Assignee:

Syncrotronics Corp. - Chestnut Hill MA

International Classification:

H01J 4014

US Classification:

250214VT, 2502141, 2502081

Abstract:

An imaging system is disclosed for use in low-light environments or environments where low-levels of such radiation is desirable. Examples of such environments are endoscopy, laparoscopy, mammography and night photography. In the case of radiation that is other than visible light, a radiation converter and method for fabricating same is disclosed. The radiation converter comprises a film of heavy scintillator (e. g. CdWO ) coated on a fiber optical window to efficiently convert the radiation into visible light. The visible light is passed into a signal amplifier employing a focussing electron-bombarded charge-couple device (FEBCCD) or a focussing electron-bombarded complementary metal-oxide semiconductor (FEBCMOS) to amplify the signal. Novel methods of performing three-dimension imaging using this system as well as removing the effects of high-speed movement are also disclosed.

US Patent:

6920238, Jul 19, 2005

Filed:

Dec 3, 1996

Appl. No.:

09/254959

Inventors:

Min Chen - Brookline MA, US
Roudolf S. Shouvalov - Protvino, RU
Sergei Vasilievich Golovkine - Protvino, RU
Skiff Sokolov - Protvino, RU

Assignee:

Synchrotronics, Co. - Arlington MA

International Classification:

G06K009/00

US Classification:

382128, 378 984, 378 986, 378113

Abstract:

An imaging system is disclosed for use in low-light environments or environments where low-levels of such radiation is desirable. Examples of such environments are night photography, laparoscopy, and mammography. In the case of radiation that is other than visible light, a radiation converter and method for fabricating same is disclosed. The radiation converter comprises a film of heavy scintillator (e. g. CdWO4) coated on a fiber optical window to efficiently convert the radiation into visible light. The visible light is passed into a signal amplifier employing an electron-bombarded charge-couple device (EBCCD) to amplify the signal. Novel methods of performing three-dimension imaging using this system as well as removing the effects of high speed movement are also disclosed.

US Patent:

7035372, Apr 25, 2006

Filed:

Sep 6, 2002

Appl. No.:

10/236522

Inventors:

Min Chen - Brookline MA, US

Assignee:

Synchrotronics, Co. - Arlington MA

International Classification:

G01N 23/04

US Classification:

378 62, 378 988, 378 983

Abstract:

An imaging system is disclosed for use in low-light environments or environments where low-levels of such radiation is desirable. Examples of such environments are endoscopy, laparoscopy, mammography and night photography. In the case of radiation that is other than visible light, a radiation converter and method for fabricating same is disclosed. The radiation converter comprises a film of heavy scintillator (e. g. CdWO) coated on a fiber optical window to efficiently convert the radiation into visible light. The visible light is passed into a signal amplifier employing a focussing electron-bombarded charge-couple device (FEBCCD) or a focussing electron-bombarded complementary metal-oxide semiconductor (FEBCMOS) to amplify the signal. Novel methods of performing three-dimension imaging using this system as well as removing the effects of high-speed movement are also disclosed.

US Patent:

7502192, Mar 10, 2009

Filed:

Jul 11, 2006

Appl. No.:

11/484492

Inventors:

Zhi Wang - Irvine CA, US
Min Chen - San Rafael CA, US
Robert J. McNab - San Jose CA, US
Jenghung Cheng - Cupertino CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B 21/02
G11B 5/596

US Classification:

360 75, 360 76, 360 7704

Abstract:

A method is disclosed for efficiently determining and writing repeatable runout (RRO) compensation value sets for data tracks on a magnetic disk in a disk drive. The disk drive has a magnetoresistive (MR) head having a read element and a separate write element, and a secondary actuator coupled to the end of a primary actuator for adjusting a head skew angle. In the method, the head skew angle is set such that the read and write elements are substantially aligned along the first track. A position error signal for each servo sector is determined over a predetermined number of disk revolutions during track following along a first data track. An RRO compensation value set is calculated for the first data track based on the position error signals. The RRO compensation value set is written for the first data track. A seek operation is then performed to a second data track.

US Patent:

8553351, Oct 8, 2013

Filed:

Oct 6, 2011

Appl. No.:

13/267196

Inventors:

Aswartha Narayana - Aliso Viejo CA, US
Chuanwen Ji - Irvine CA, US
Duc T. Phan - Saratoga CA, US
Min Chen - San Jose CA, US
Hengchang Guo - Rancho Santa Margarita CA, US

Assignee:

Western Digital Technologies, Inc. - Irvine CA

International Classification:

G11B 21/02

US Classification:

360 75, 360 7708

Abstract:

A disk drive is disclosed comprising a head actuated over a disk, the disk comprising a plurality of servo tracks defined by a plurality of servo sectors. An estimated radial location of the head is generated in response to an actuator control signal. A Gray coded track ID is detected from reading a servo sector, and decoded into a detected track ID. A burst position error signal (PES) is generated from reading servo bursts in the servo sector, wherein the burst PES represents a detected fractional servo track offset of the head. When the detected track ID is corrupt, a corrected track ID is generated using the estimated radial location and the burst PES, and the actuator control signal is adjusted in response to the corrected track ID and the burst PES.

US Patent:

20090218235, Sep 3, 2009

Filed:

Dec 29, 2008

Appl. No.:

12/317935

Inventors:

Robert C. McDonald - Stow MA, US
Katherine E. Harrison - North Cambridge MA, US
Min Chen - Naperville IL, US

International Classification:

G01N 27/26

US Classification:

205775, 204431

Abstract:

Metal-oxide gas sensor. According to one embodiment, the sensor includes a layer or pellet of tungsten trioxide (WO) substituted with one or more added metals. Preferably, the added metals are substituted in a concentration between about 0.005 and 10%, have an oxidation state less than +6, and possess a similar ionic radius to W. The substituted metal oxides are preferably formed as nanoparticles and sintered into a dense structure or coating possessing a surface-depletion layer sensitive to the surface adsorption of gas molecules and whose resistance changes in a predictable manner with gas adsorption. The extent of resistance change, rate of change and rate of desorption can be different for different gases, depending on the gas molecule's polarizability, dipole moments and electron configuration. The sensor can be used in a wide range of temperatures and corrosive conditions because of the intrinsic stability of the substituted metal oxides.

US Patent:

20140048725, Feb 20, 2014

Filed:

Aug 20, 2012

Appl. No.:

13/589930

Inventors:

Zhaoyun Duan - Chengdu, CN
Xin Guo - Chengdu, CN
Chen Guo - Chengdu, CN
Yubin Gong - Chengdu, CN
Min Chen - Cambridge MA, US

International Classification:

H01J 21/02

US Classification:

2504931

Abstract:

A method for generating high power electromagnetic radiation based on double-negative metamaterial (DNM), includes providing electrons of an electron beam moving in a vacuum close to an interface between the DNM and the vacuum at a predetermined average speed larger than a phase velocity of an electromagnetic wave propagating in the DNM so as to generate coherent high power radiation. The method can be applied but not limited to high power and compact Terahertz radiation sources and Cherenkov particle detectors and emitters.

US Patent:

56659717, Sep 9, 1997

Filed:

Aug 8, 1995

Appl. No.:

8/512321

Inventors:

Min Chen - Brookline MA
Alexander I. Bolozdynya - Hoffman Estates IL

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

G01T 1161
G01T 1185
G01T 1205

US Classification:

2503851

Abstract:

A nuclear or x-ray detector which utilizes Compton double-scattering of photons by radiation particles, followed by photoelectron absorption, to reconstruct the energy and direction of such particles.