US3688569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic surface roughness indicator
Assignee: STAVELEY INSTRUMENTS Inc 421 NORTH QUAY STREET KENNEWICK WA 99336 A CORP OF WA
•
Filing: 1970-07-16
•
Granted: 1972-09-05
•
Expires: 1990-07-16
Abstract
Abstract There is disclosed herein a test system for measuring the surface roughness of a workpiece by transmitting a beam of ultrasonic energy onto the surface at an oblique angle. Smooth surfaces reflect the beam with a minimum effect upon the shape of the beam whereas rough surfaces reflect the beam so as to cause it to be scattered. The detected reflected energy varies as a function of surface roughness.
Inventors
- 👤 Andrew M Murdoch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:26
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/04; G01N29/041
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
A test system for measuring the surface roughness of a workpiece, comprising means for directing ultrasonic energy onto a predetermined portion of the surface of the workpiece at a fixed angle whereby the amount of energy reflected from said portion is a function of the roughness thereof, said means being adapted to receive at least a portion of the ultrasonic energy reflected from said portion of said surface and to generate a signal having a magnitude corresponding to the amount of ultrasonic energy reflected from said portion of said surface to said means, and means responsive to the magnitude of said signal for indicating the roughness of said portion of the surface of the workpiece.
Claim 2
Dependent Claim
115 words
A test system for measuring the surface roughness of a workpiece, comprising means for directing ultrasonic energy onto a predetermined portion of the surface of the workpiece at a fixed angle whereby the amount of energy reflected from said portion is a function of the roughness thereof, said means being adapted to receive at least a portion of the ultrasonic energy reflected from said portion of said surface and to generate a signal having a magnitude corresponding to the amount of ultrasonic energy reflected from said portion of said surface to said means, and means responsive to the magnitude of said signal for indicating the roughness of said portion of the surface of the workpiece.
Claim 3
Dependent Claim
128 words
An ultrasonic test system for determining the roughness of the surface of a workpiece including the combination of means for transmitting and receiving ultrasonic energy, said means being effective to transmit ultrasonic energy onto a predetermined portion of a surface of the workpiece at a fixed oblique angle whereby the amount of ultrasonic energy reflected from said portion in a predetermined direction is a function of the roughness of said portion, said means being effective to receive the energy reflected from said portion in said direction an to produce a signal having a magnitude which is a function of the received energy, and detecting means coupled to said first means and responsive to the magnitude of said signal to indicate the roughness of said portion of said surface.
Claim 4
Dependent Claim
128 words
An ultrasonic test system for determining the roughness of the surface of a workpiece including the combination of means for transmitting and receiving ultrasonic energy, said means being effective to transmit ultrasonic energy onto a predetermined portion of a surface of the workpiece at a fixed oblique angle whereby the amount of ultrasonic energy reflected from said portion in a predetermined direction is a function of the roughness of said portion, said means being effective to receive the energy reflected from said portion in said direction an to produce a signal having a magnitude which is a function of the received energy, and detecting means coupled to said first means and responsive to the magnitude of said signal to indicate the roughness of said portion of said surface.
Claim 5
Dependent Claim
69 words
The system of claim 2 wherein the workpiece has a second surface opposite the first surface, said first means is effective to transmit a portion of the ultrasonic energy through the workpiece to reflect from the second surface and produce a second signal corresponding to the surface roughness of the second surface, said detecting means being responsive to said second signal to indicate the roughness of the second surface.
Claim 6
Dependent Claim
39 words
The system of claim 3 wherein said first means transmits said ultrasonic energy in a series of pulses of predetermined duration, gate means in said detecting means for selectively gating the first and second signals to said measuring means.
Claim 7
Dependent Claim
114 words
A test system for measuring the surface roughness of a workpiece including the combination of transmitter means adapted to produce a series of pulses, transducer means coupled to said transmitter and responsive to said pulses, said transducer means being effective to transmit pulses of ultrasonic energy onto a preselected portion of said surface at a fixed oblique angle, said transducer means being effective to receive echoes of said pulses of ultrasonic energy reflected from said portion and to produce an electrical signal corresponding thereto, and a receiver coupled to said transducer means to receive the electrical signals generated by said transducer means, said receiver being effective to indicate the surface roughness of the workpiece.
Claim 8
Dependent Claim
114 words
A test system for measuring the surface roughness of a workpiece including the combination of transmitter means adapted to produce a series of pulses, transducer means coupled to said transmitter and responsive to said pulses, said transducer means being effective to transmit pulses of ultrasonic energy onto a preselected portion of said surface at a fixed oblique angle, said transducer means being effective to receive echoes of said pulses of ultrasonic energy reflected from said portion and to produce an electrical signal corresponding thereto, and a receiver coupled to said transducer means to receive the electrical signals generated by said transducer means, said receiver being effective to indicate the surface roughness of the workpiece.
Claim 9
Dependent Claim
19 words
The test system of claim 5 including a gate in said receiver effective to OPEN during said received signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |