Carl Irvan Rhoads

US Patent:

53396910, Aug 23, 1994

Filed:

Oct 13, 1993

Appl. No.:

8/138042

Inventors:

Anthony Smith - Oxnard CA
Dan Goff - Ventura CA
Roman Kruchowy - Somis CA
Carl Rhoads - Ventura CA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01H 500
G01N 2918

US Classification:

73597

Abstract:

An ultrasonic system for determining the quality of concrete under water hout inaccuracies caused by electromagnetic interference from the ultrasonic generator. An ultrasonic generator applies pulses to the concrete. An ultrasonic detector detects the ultrasonic pulses and produces corresponding signals that are indicative of ultrasonic pulses that have passed through the material. Signal processing circuitry processes the signals to determine the transit time of the ultrasonic pulses through the material. The signal processing circuitry is disabled for a predetermined time after application of each ultrasonic pulse to the material to prevent noise produced by the means for applying ultrasonic pulses to the material from entering the signal processing circuitry and causing spurious measurements.

US Patent:

53117646, May 17, 1994

Filed:

Jul 19, 1993

Appl. No.:

8/094662

Inventors:

Anthony Smith - Oxnard CA
Dan Goff - Ventura CA
Roman Kruchowy - Somis CA
Carl Rhoads - Ventura CA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01L 500

US Classification:

73 1204

Abstract:

A measuring apparatus which detects defects in underwater concrete structs by measuring the compressive strength of the structure. The measuring apparatus comprises a rebound hammer which has extending from the nose thereof a plunger. The plunger is pressed against the structure whose compressive strength is being measured forcing the plunger into the rebound hammer's housing which releases a spring driven mass. A resistive film strip which is in electrical contact with the mass detects the maximum rebound of the mass and provides an electrical signal indicative of this maximum rebound. A data acquisition and processing circuit comprising a microprocessor and signal conditioning electronics receives, processes and stores the electrical signals provided by the resistive strip. This circuit includes a peak detection circuit which captures the peak output signal from the resistive strip. The peak detection circuit then interrupts the microprocessor and sends an analog signal proportional to the maximum rebound of the mass to an analog to digital converter which converts the analog signal to a digital data for processing by the microprocessor.

US Patent:

51545373, Oct 13, 1992

Filed:

May 28, 1991

Appl. No.:

7/706505

Inventors:

Jack DeVries - Dodoma, TZ
Carl Rhoads - Ventura CA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

E02B 802

US Classification:

405 60

Abstract:

An apparatus for reducing sedimentation in ship berths including one or m modules, spanning the entrance of a ship berth and providing a continuous, homogeneous, impervious barrier, each module including a base located on the sea floor, an accordion type curtain extendable in the vertical direction and attached on its bottom side to the base, a float attached to the curtain on the top side, a primary operating system for raising and lowering the curtain and a secondary operating system for raising the entire apparatus to the sea surface for repair or removal.