초록 ▼

A method and apparatus for indicating the time-break on a seismic record wherein the time-break is marked in response to the rupture of an electric circuit by the explosive charge used to generate the seismic waves. The preferred rupturable electric circuit is connected to the same energy source as

A method and apparatus for indicating the time-break on a seismic record wherein the time-break is marked in response to the rupture of an electric circuit by the explosive charge used to generate the seismic waves. The preferred rupturable electric circuit is connected to the same energy source as the electric detonator used to initiate the explosive charge and the preferred electric detonator is one connected to a high frequency A.C. firing energy source through a transformer, the rupturable electric circuit being the primary or secondary circuit of the transformer. The method is more accurate than the present method of marking the time-break at the initial application of current to the detonator.

대표청구항 ▼

A method of seismic recording wherein seismic waves are generated by firing an explosive charge by means of a detonator having an electrical ignition element and are subsequently recorded after reflection or refraction at subterranean rock layer interfaces, the said method comprising the steps of: f

A method of seismic recording wherein seismic waves are generated by firing an explosive charge by means of a detonator having an electrical ignition element and are subsequently recorded after reflection or refraction at subterranean rock layer interfaces, the said method comprising the steps of: feeding firing energy from an A.C. energy source to said electric ignition element through a transformer which has a primary circuit connected to said A.C. source and a secondary circuit connected to said electric ignition element, said primary circuit having a breakable portion adapted and disposed so as to be ruptured by the explosion of said explosive charge; detecting the time when the said breakable circuit portion is broken; and, in response thereto, making a mark on the seismic record to indicate a time-break on the record.