Patent
Two geophone underwater acoustic intensity probe
| العنوان: | Two geophone underwater acoustic intensity probe |
|---|---|
| Patent Number: | 617,294& |
| تاريخ النشر: | January 09, 2001 |
| Appl. No: | 09/237,529 |
| Application Filed: | January 27, 1999 |
| مستخلص: | Acoustic intensity is measured by a submerged probe consisting of two passive geophones mounted in spaced relationship with their sensing axes aligned. The geophones are connected through a cable to a remote spectrum analyzer in which acoustic intensity is computed from the velocity gradient between the two geophones. The exclusive use of geophones, which inherently have low impedance outputs, eliminates the need for preamplification in the probe. The geophones are mounted inside an acoustically transparent, thin rubber shell, which reduces the effects of noise due to flow. |
| Inventors: | McConnell, James A. (Port Matilda, PA); Lauchle, Gerald C. (State College, PA); Gabrielson, Thomas B. (State College, PA) |
| Assignees: | The United States of America as represented by the Secretary of the Navy (Washington, DC) |
| Claim: | What is claimed is |
| Claim: | 1. A method for measuring underwater acoustic intensity comprising the steps of |
| Claim: | submerging a sensor comprising two passive geophones in a body of water, the geophones being in spaced relationship to each other and having sensing axes in alignment alone a common axis; |
| Claim: | exposing the geophones to an acoustic signal in said body of water; |
| Claim: | transmitting output signals from the passive geophones, through cable means directly to analyzing apparatus on the surface at a location remote from said sensor, said output signals being independent of each other when received by the analyzing apparatus and being proportional to the acoustic particle velocity components along said axis as measured by the respective geophones; and |
| Claim: | computing the acoustic intensity along said axis, by means of said analyzing apparatus, from the output signals transmitted through the cable means, by calculating, from said acoustic Particle velocity components, the imaginary part of the cross-spectrum between the geophones. |
| Claim: | 2. The method according to claim 1, in which, when the sensor is submerged in a body of water, the geophones are situated within an acoustically transparent shell, filled with water or a water-like liquid. |
| Claim: | 3. The method according to claim 1, in which the geophones, when submerged, are magnetically shielded from each other. |
| Current U.S. Class: | 367/178; 367/171; 367/173; 367/188; 367/131; 181/122 |
| Current International Class: | H04R 100 |
| Patent References Cited: | 3593258 July 1971 Slavens 3720909 March 1973 Sikora 3980985 September 1976 Dale et al. 5084846 January 1992 Smith, Jr. 5189642 February 1993 Donoho et al. |
| Primary Examiner: | Lobo, Ian J. |
| Attorney, Agent or Firm: | Billi, Ron |
| رقم الانضمام: | edspgr.0617294. |
| قاعدة البيانات: | USPTO Patent Grants |
| الوصف غير متاح. |