James A Matson

US Patent:

45150214, May 7, 1985

Filed:

Jul 29, 1983

Appl. No.:

6/518738

Inventors:

David R. Wallace - Milton MA
James M. Korba - Woburn MA
James E. Matson - Brookline MA
Lawrence C. Lynnworth - Waltham MA

Assignee:

Panametrics, Inc. - Waltham MA

International Classification:

G01F 166

US Classification:

7386127

Abstract:

An intervalometer for determining the transit time of an ultrasonic energy pulse through a fluid medium employs an automatic gain control amplifier circuit for amplitude stabilizing the electrical signal derived at a receiving transducer. The automatic gain control circuit tracks both a rapidly increasing and a rapidly decreasing signal amplitude. In various embodiments, synchronous switching can be employed in conjunction with a single amplifier and a plurality of storage elements to rapidly scan a plurality of signal paths and for providing automatic gain control capability on each path. The intervalometer further has a "slipped cycle" capability for accurately determining arrival time when is is known that the signal pulse will be within a certain range of times. In addition, the relative time difference between two arriving signal pulses can be accurately determined using this method so long as the range of time difference is sufficiently small. The intervalometer also provides for bad data rejection based upon limits applied to either transit time or signal amplitude.

US Patent:

45384690, Sep 3, 1985

Filed:

Jul 29, 1983

Appl. No.:

6/518344

Inventors:

Lawrence C. Lynnworth - Waltham MA
James E. Matson - Brookline MA

Assignee:

Panametrics, Inc. - Waltham MA

International Classification:

G01F 166

US Classification:

7386127

Abstract:

An intervalometer for determining the arrival time of a bandwidth limited energy pulse employs an integrated threshold arming apparatus and method for conditioning an event recognition circuit. The event recognition circuit, which is typically a zero crossing detector, responds to the conditioning signal for detecting a predetermined event after occurrence of said conditioning signal. The integrated threshold arming circuit employs a signal integration circuit responsive preferably to a rectified signal input, and comparison means for determining when the integrated value crosses a predetermined threshold. A dual threshold implementation can also be employed to further discriminate against false noise signals. The apparatus and method are preferably employed in connection with volumetric flow measurements of turbulent and time-varying fluids by ultrasonic pulse interrogation.

US Patent:

54409373, Aug 15, 1995

Filed:

Apr 30, 1993

Appl. No.:

8/055200

Inventors:

Lawrence C. Lynnworth - Waltham MA
James E. Bradshaw - Tyngsboro MA
Christopher C. Doyle - Weston MA
Steven A. Lynnworth - Natick MA
James E. Matson - Needham MA
Jeffrey Tilden - Norton MA

Assignee:

Panametrics, Inc. - Waltham MA

International Classification:

G01F 166

US Classification:

7386129

Abstract:

An apparatus and method for measuring gas flow velocity through a high stack employs ultrasonic transducers. The transducers are placed on opposite ends of a diameter several hundred feet up, with a small vertical separation L between the transducers. Apparatus for measuring acoustic velocity in the stack gas over short path lengths is also included.

US Patent:

20190293465, Sep 26, 2019

Filed:

Mar 21, 2019

Appl. No.:

16/360635

Inventors:

- Billerica MA, US
Lei Sui - Billerica MA, US
James Edward Matson - Billerica MA, US
Toan Huu Nguyen - Billerica MA, US
Rachel Brielle Avioli - Medford MA, US

International Classification:

G01F 1/66

Abstract:

Online installation systems and methods are provided for online installations of ultrasonic steam measurement devices in steam pipes. In one embodiment, a tool is provided and includes a transducer assembly configured to be coupled to a distal end of an isolation valve installed on a pressurized steam pipe. An ultrasonic transducer can be movably disposed within the transducer assembly, and the ultrasonic transducer can extend through a proximal opening of the transducer assembly and through a distal opening of the transducer assembly. The tool can also include an insertion mechanism configured to be coupled to a distal end of the transducer assembly and having a cylindrical housing at least partially enclosing the ultrasonic transducer. The insertion mechanism can include a linear actuator assembly configured to linearly actuate the ultrasonic transducer.