Counter-mining using laser induced pressure wave
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F41H-011/16
F41H-011/00
출원번호
US-0995832
(2004-11-23)
등록번호
US-7350447
(2008-04-01)
발명자
/ 주소
Smith,David C.
출원인 / 주소
Smith,David C.
대리인 / 주소
Nessler,C.
인용정보
피인용 횟수 :
3인용 특허 :
2
초록▼
Buried land mines, which are triggered by pressure, particularly anti-personnel mines which are triggered by the pressure of a person's foot, are destroyed by impinging laser beam pulses on the surface of the soil. With appropriately chosen beam parameters, a laser supported detonation is created in
Buried land mines, which are triggered by pressure, particularly anti-personnel mines which are triggered by the pressure of a person's foot, are destroyed by impinging laser beam pulses on the surface of the soil. With appropriately chosen beam parameters, a laser supported detonation is created in the atmosphere above the soil by each beam pulse impingement. That results in a blast wave within the soil, the pressure of which causes a mine trigger to explode the mine. A multiplicity of beam pulses are impinged on the soil surface in location-and time-coordination, to create a multiplicity of blast waves which provide pressure-time profiles within the shallow depth of the soil, sufficient to trigger mine types that are configured to resist triggering from a single detonation, whether induced by laser or chemical means.
대표청구항▼
I claim: 1. A method for counter-mining of a land mine contained within soil, wherein the mine has a trigger which responds to pressure, which method comprises: generating a pulse of radiation from a laser and transmitting the radiation as a beam pulse; impinging the beam pulse on a first impingeme
I claim: 1. A method for counter-mining of a land mine contained within soil, wherein the mine has a trigger which responds to pressure, which method comprises: generating a pulse of radiation from a laser and transmitting the radiation as a beam pulse; impinging the beam pulse on a first impingement spot at the surface of the soil, without impinging the beam pulse on said mine; wherein the beam pulse has an intensity sufficient to create a laser supported detonation (LSD) at said soil surface, to thereby create an associated blast wave within the soil in vicinity of the first impingement spot; and, wherein the pressure of the blast wave is sufficient to cause the trigger to explode said mine. 2. The method of claim 1 wherein a multiplicity of mines are contained within the soil, and at least one mine is exposed on at the surface, wherein the intensity of the beam is sufficient to destroy said at least one exposed mine. 3. The method of claim 1 wherein the laser beam radiation has a wavelength of about 1.06 micron, wherein the pulse time is greater than 10-7 sec, and wherein the beam intensity is at least 108 W/cm2. 4. The method of claim 1 wherein the beam energy is about 50 joules per square centimeter and the pulse time is about 100 nanoseconds. 5. The method of claim 1, wherein further comprises: generating and impinging repetitive pulses of said laser beam radiation onto the surface of soil, to thereby create a multiplicity of blast waves spaced over time within the soil, so that the pressure in the soil is elevated for a substantial period of time, compared to the time of pressure elevation which results from a single LSD. 6. The method of claim 5 wherein a multiplicity of mines are contained within said soil; and wherein at least one of said mines has a trigger which does not respond to the blast wave which results from impingement of only a single one of said multiplicity of beams. 7. A method for counter-mining of a land mine contained within soil, wherein the mine has a trigger which responds to pressure, which method comprises: generating a pulse of radiation from a laser and transmitting the radiation as a beam pulse; impinging the beam pulse on a first impingement spot at the surface of said soil; wherein the beam pulse has an intensity sufficient to create a laser supported detonation (LSD) at said soil surface, to thereby create an associated blast wave within the soil in vicinity of the first impingement spot; wherein the intensity of the laser beam pulse if greater than 107 W/cm2 and less than about 5��108 W/cm2; and, wherein the pressure of said associated blast wave is sufficient to cause the trigger to explode the mine. 8. A method for counter-mining of a land mine contained within soil, wherein the mine has a trigger which responds to pressure, which method comprises: generating a pulse of radiation from a laser and transmitting the radiation as a beam pulse; impinging the beam pulse on a first impingement spot at the surface of said soil; wherein the beam pulse has an intensity sufficient to create a laser supported detonation (LSD) at said soil surface, to thereby create an associated blast wave within the soil in vicinity of the first impingement spot; and, repetitively generating and impinging a similar laser beam pulse on a multiplicity of other impingement spots on a selected portion of the surface of the soil, which spots are spaced apart from said first impingement spot, to thereby create a multiplicity of LSD and associated blast waves which are sufficiently close in time to provide pressure within the soil which extends over a time which is substantially greater than the duration of pressure from a single LSD and blast wave, wherein said extended-time pressure is sufficient to cause the trigger to explode the said mine. 9. A method for detonating land mines contained upon or within soil using a laser, wherein the mines explode when triggers respond to predetermined pressure-time profile which extends over a greater time than the duration of a blast wave resulting from a laser supported detonation created by impingement of a single laser beam pulse on the surface of the soil, which comprises: generating a multiplicity of pulses of radiation from one or more lasers and impinging the radiation as a multiplicity of beam pulses on one or more impingement spots on the surface of soil; wherein each beam pulse has an intensity sufficient to create a laser supported detonation (LSD) at said soil surface and an associated blast wave within the soil in vicinity of the beam pulse impingement spot; and, wherein the multiplicity of said associated blast waves is sufficient closely spaced in time to create a pressure-time profile at a point within the soil which causes one of said mine triggers to explode an associated mine. 10. The method of claim 9 wherein at least some of said multiplicity of beam pulses are from the beam of a laser which is split into a first split beam and a second split beam prior to reaching the impingement spot. 11. The method of claim 10 wherein at least two beam pulses are impinged on the soil surface, each at a different time. 12. The method of claim 11 wherein the impingement spots of the two beam pulses are the same. 13. The method of claim 9 wherein at least two beam pulses are impinged on the soil surface at impingement points which are spaced apart. 14. The method of claim 13 wherein said at least two beam pulses are impinged on the soil surface simultaneously. 15. The method of claim 9 wherein at least two lasers are used; wherein at least one beam pulse from a first laser is first sent upwardly to a means for deflecting the beam; and, wherein said at least one beam pulse is then deflected downwardly onto the soil surface at a desired and variable location. 16. The method of claim 9 wherein the trigger of a mine buried in said soil is responsive to the foot pressure of a human being traveling across the soil surface and unresponsive to the pressure of a blast wave created by impingement on the soil surface of only a single one of said multiplicity of beam pulses. 17. The method of claim 9 wherein the trigger of a mine buried in said soil is responsive to the amount and duration of pressure resulting from the single foot fall of a human being and not responsive to pressures which are substantially higher and shorter in duration.
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이 특허에 인용된 특허 (2)
Seregelyi, Joseph S.; Bergeron, Denis M.; Kashyap, Satish, Landmine neutralizer using a high power microwave device.
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