[특허]Method and device for excavating submerged stratum

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	E02F-003/90 E02F-001/00 E21C-037/16 A61N-005/00
출원번호	UP-0659730 (2006-03-16)
등록번호	US-7802384 (2010-10-21)
우선권정보	JP-2005-129338(2005-04-27)
국제출원번호	PCT/JP2006/305234 (2006-03-16)
§371/§102 date	20070208 (20070208)
국제공개번호	WO06/117935 (2006-11-09)
발명자 / 주소	Kobayashi, Toshio Takayama, Kazuyoshi Ueda, Ken-ichi Otomo, Kazuhisa Uetake, Shigehito
출원인 / 주소	Japan Drilling Co., Ltd. Tohoku University National University Corporation the University of Electro-Communications
대리인 / 주소	Oliff & Berridge, PLC
인용정보	피인용 횟수 : 39 인용 특허 : 15

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An excavation technique for a stratum capable of excavating a submerged stratum such as a layer containing an underground resource by using laser irradiation in liquid is provided. In this technique, a laser beam transmitted through laser transmission means 20 is irradiated in liquid 90 in form of a

An excavation technique for a stratum capable of excavating a submerged stratum such as a layer containing an underground resource by using laser irradiation in liquid is provided. In this technique, a laser beam transmitted through laser transmission means 20 is irradiated in liquid 90 in form of a laser beam having a wavelength with high absorptance of the liquid 90 by laser-induced bubble generation means 35, generating a bubble flow 36, thus excavation of a submerged stratum may be carried out by using a laser-induced destruction effect. Moreover, a laser beam 41 having low absorptance of the liquid 90 is irradiated by laser irradiation means 39 and passed through the bubble flow 36, thereby applying a thermal effect to a stratum to destroy rock and excavate the stratum. The destruction effect and the thermal effect also may be cooperatively worked.

대표청구항 ▼

The invention claimed is: 1. A method for excavating a submerged stratum comprising the steps of: inducing laser-induced force and laser irradiation in liquid using a first laser, thereby generating a bubble near an end of an output section of the first laser; generating thermal effect on the subme

The invention claimed is: 1. A method for excavating a submerged stratum comprising the steps of: inducing laser-induced force and laser irradiation in liquid using a first laser, thereby generating a bubble near an end of an output section of the first laser; generating thermal effect on the submerged stratum using a second laser, a beam of the second laser passing through the bubble created by the first laser; and excavating the submerged stratum by using the laser-induced force and the thermal effect. 2. The method for excavating a submerged stratum according to claim 1, wherein the laser-induced force by the first laser is an effect based on at least one of a shock wave, a jet stream, a bubble flow and an acoustic wave. 3. The method for excavating a submerged stratum according to claim 1, wherein the first laser is one of a pulsed laser and a continuous-wave laser turned on and off intermittently. 4. The method for excavating a submerged stratum according to claim 1, wherein the second laser is one of a pulsed laser and a continuous-wave laser. 5. The method for excavating a submerged stratum according to claim 1, wherein the first laser is a solid laser. 6. The method for excavating a submerged stratum according to claim 1, wherein the second laser is a solid laser. 7. A device for excavating a submerged stratum including: first laser oscillation means; second laser oscillation means; laser transmission means; and laser irradiation means, wherein the first laser oscillation means outputs at least one of a pulsed laser beam and a continuous-wave laser beam and adjusts at least one parameter selected from a group consisting of a laser pulse energy, a laser beam quality, a laser pulse width, a laser frequency and a laser wavelength, the second laser oscillation means outputs at least one of the pulsed laser beam and the continuous-wave laser beam and adjusts a laser frequency and a laser wavelength, and the first laser oscillation means induces laser-induced force and laser irradiation in liquid that generates a bubble near an end of an output section of the laser irradiation means, and the second laser oscillation means generates thermal effect on the submerged stratum by a beam passing through the bubble. 8. The device for excavating a submerged stratum according to claim 7, further comprising at least one of a laser wavelength conversion means and a laser pulse compression means. 9. The device for excavating a submerged stratum according to claim 7, wherein at least one of the first and second laser oscillation means is disposed in a pipe within an open hole. 10. The device for excavating a submerged stratum according to claim 9, wherein a laser bit composed of at least one of the first and second laser oscillation means and the laser irradiation means is disposed in a front end of the pipe within the open hole. 11. The device for excavating a submerged stratum according to claim 10, wherein the laser bit includes at least one of the laser wavelength conversion means and the laser pulse compression means. 12. The device for excavating a submerged stratum according to claim 7, wherein the laser transmission means comprises fibers composed of a single fiber and a plurality of fibers that sandwich laser incident means therebetween, a plurality of a single fiber, and one of a multicore fiber and a bundle fiber.

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