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Constant frequency pulsed phase-locked loop measuring device
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Copyright Year | 1993 |
| Description | A measuring apparatus is presented that uses a fixed frequency oscillator to measure small changes in the phase velocity ultrasonic sound when a sample is exposed to environmental changes such as changes in pressure, temperature, etc. The invention automatically balances electrical phase shifts against the acoustical phase shifts in order to obtain an accurate measurement of electrical phase shifts. |
| File Size | 710959 |
| Page Count | 12 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19930019895 |
| Archival Resource Key | ark:/13960/t5bc8wg7h |
| Language | English |
| Publisher Date | 1993-06-01 |
| Access Restriction | Open |
| Subject Keyword | Electrical Measurement Phase Velocity Acoustic Measurement Phase Locked Systems Phase Shift Measuring Instruments Automatic Control Ultrasonic Radiation Frequency Measurement Oscillators Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Patent |
