Remote detonation system

Claim 2

A remote detonation system comprising a control station including oscillator means for generating a plurality of frequency modulated waves and a sound wave transmitter for transmitting said frequency modulated waves through water as frequency modulated command signals; one or a plurality of detonation control elements, each including a sound wave receiver for receiving said frequency modulated command signals from said control station, means for demodulating the output from said sound wave receiver for reproducing said frequency modulated command signals and ignition means including a plurality of switches which are operated sequentially by the output of said demodulating means; a plurality of electric detonators each connected to said ignition means of said detonation control element; and a plurality of underwater explosives detonated by the detonations of respective electric detonators.

Claim 3

A remote demodulation system comprising a control station including oscillator means for producing a plurality of frequency modulated waves and a sound wave transmitter for transmitting said frequency modulated wave through water as frequency modulated command signals; a main detonation control element including a first sound wave receiver for receiving said frequency modulated command signals from said control station, means for demodulating the output from said sound wave receiver for reproducing said frequency modulated command signals, and ignition means including a plurality of switches which are operated sequentially by the output of said demodulating means; an electric detonator connected to said ignition means of said main detonation control element; a underwater main explosive detonated by the detonation of said electric detonator; a second sound wave receiver for receiving said frequency modulated command signals from said control station and the percussion wave Generated by the detonation of said main explosive; a plurality of auxiliary detonation control elements, each including means for selectively demodulating the output from said second sound wave receiver for reproducing only a predetermined one of said frequency modulated command signals, level setting means connected to said second sound wave receiver for detecting and transforming the received percussion wave into an electric signal, and ignition means including switch means operated by the outputs of said demodulating means and said level setting means; a plurality of auxiliary electric detonators each connected to said ignition means of said auxiliary detonation control element; and a plurality of underwater auxiliary explosives each detonated by the detonation of said auxiliary electric detonator.

Claim 4

A remote demodulation system comprising a control station including oscillator means for producing a plurality of frequency modulated waves and a sound wave transmitter for transmitting said frequency modulated wave through water as frequency modulated command signals; a main detonation control element including a first sound wave receiver for receiving said frequency modulated command signals from said control station, means for demodulating the output from said sound wave receiver for reproducing said frequency modulated command signals, and ignition means including a plurality of switches which are operated sequentially by the output of said demodulating means; an electric detonator connected to said ignition means of said main detonation control element; a underwater main explosive detonated by the detonation of said electric detonator; a second sound wave receiver for receiving said frequency modulated command signals from said control station and the percussion wave Generated by the detonation of said main explosive; a plurality of auxiliary detonation control elements, each including means for selectively demodulating the output from said second sound wave receiver for reproducing only a predetermined one of said frequency modulated command signals, level setting means connected to said second sound wave receiver for detecting and transforming the received percussion wave into an electric signal, and ignition means including switch means operated by the outputs of said demodulating means and said level setting means; a plurality of auxiliary electric detonators each connected to said ignition means of said auxiliary detonation control element; and a plurality of underwater auxiliary explosives each detonated by the detonation of said auxiliary electric detonator.

Claim 5

The remote detonation system according to claim 1 wherein said oscillation means of said control station comprises a carrier wave oscillator, a plurality of modulation signal generators, a frequency modulator connected to said carrier wave oscillator, a timing gate circuit for sequentially applying the outputs of said plurality of modulation signal generators; and a power amplifier to amplify the output from said frequency modulator for supplying the amplified output to said sound wave transmitter.

Claim 6

The remote detonation system according to claim 2 wherein said oscillation means of said control station comprises a carrier wave oscillator, a plurality of modulation signal generators, a frequency modulator connected to said carrier wave oscillator, a timing gate circuit for sequentially applying the outputs of said plurality of modulation signal generators; and a power amplifier to amplify the output from said frequency modulator for supplying the amplified output to said sound wave transmitter.

Claim 7

The remote detonation system according to claim 2 wherein the demodulating means of said main detonation control element comprises means for detecting a plurality of simultaneously received frequency modulated command signals and timing means for arranging in parallel the outputs of said detecting means.

Claim 8

The remote detonation system according to claim 2 wherein said auxiliary explosives controlled by said auxiliary detonation control elements are located at the bottom of water.

Claim 9

The remote detonation system according to claim 1 wherein two types of said frequency modulated command signals are used.

Claim 10

The remote detonation system according to claim 2 wherein two types of said frequency modulated command signals are used.

Claim 11

The remote detonation system according to claim 3 wherein the demodulating means of said main detonation control element comprises an amplifier for amplifying the output of said sound wave receiver, a limiter for limiting the amplitude of the output of said amplifier, a demodulator for demodulating the frequency modulated output of said limiter, a plurality of bandpass filters for filtering respective command signals out of the output from said demodulator, and a rectifying and integrating circuit to rectify and integrate the outputs from said bandpass filters for operating said switches of said ignition means.

Claim 12

The remote detonation system according to claim 8 wherein said timing circuit comprises a first rectifying and integrating circuit responsive to the detected output of a first command signal, a first Schmit circuit triggered by the output from said first rectifying and integrating circuit, a first monostable multivibrator triggered by the output from said first Schmit circuit, a second monostable multivibrator triggered by the output from said first monostable multivibrator, a second rectifying and integrating circuit response to the detected output of a second command signal, a second Schmit circuit triggered by the output from said second rectifying and integrating circuit, an AND gate circuit connected to receive at its inputs the output from said second monostable multivibrator and the output from said second Schmit circuit, means responsive to the output of said first monostable multivibrator for actuating a first switch of said ignition means, and means responsive to the output from said AND gate circuit for actuating a second switch of said ignition means.

Claim 13

The remote detonation system according to claim 8 wherein said ignition means comprises a source of supply, a series circuit including a first silicon controlled rectifier element and a load resistor, said series circuit being connected across said source, a first input terminal connected to the gate electrode of said first silicon controlled rectifier element for receiving a first input signal, a second series circuit including a charging resistor and a capacitor, said second series circuit being connected across the cathode electrode of said first silicon controlled rectifier element and the negative pole of said source, a second silicon controlled rectifier element with its anode electrode connected to the juncture between said charging resistor and said capacitor, means to connect an electric detonator across the cathode electrode of said second silicon controlled rectifier element and the negative pole of said source, and a second input terminal connected to the gate electrode of said second silicon controlled rectifier element for receiving a second input signal.