Methods, systems, and apparatus, including computer programs encoded on computer-storage media, for self-calibrating ultrasonic removal of sea lice. In some implementations, a method includes generating, by transducers distributed in a sea lice treatment station, a first set of ultrasonic signals, detecting a second set of ultrasonic signals in response to propagation of the first set of ultrasonic signals through water, determining propagation parameters of the sea lice treatment station based on the second set of ultrasonic signals that were detected, obtaining an image of a sea louse on a fish in the sea lice treatment station, determining, from the image, a location of the sea louse in the sea lice treatment station, and generating a third set of ultrasonic signals that focuses energy at the sea louse.

Systems, apparatuses, and/or methods to protect an entity. A detector may detect an animal proximate to an entity based on sensor data from a plurality of sensors. The plurality of sensors may be positioned, for example, on the entity. In addition, a protector may administer a mechanical repellant from a protection device to repel the animal proximate to the entity. The mechanical repellant may include, for example, an ultrasound wave, a vibration wave, and so on. Moreover, the mechanical repellant may be specific to a type of animal to repel the animal proximate to the entity. The mechanical repellant may further be harmless to the animal (or the entity) and/or inapplicable to at least one other animal in the environment.

Systems, apparatuses, and/or methods to protect an entity. A detector may detect an animal proximate to an entity based on sensor data from a plurality of sensors. The plurality of sensors may be positioned, for example, on the entity. In addition, a protector may administer a mechanical repellant from a protection device to repel the animal proximate to the entity. The mechanical repellant may include, for example, an ultrasound wave, a vibration wave, and so on. Moreover, the mechanical repellant may be specific to a type of animal to repel the animal proximate to the entity. The mechanical repellant may further be harmless to the animal (or the entity) and/or inapplicable to at least one other animal in the environment.

A system for directing a bird away from equipment includes an emitter configured to transmit a beam of audio-modulated ultrasonic sound. The beam of audio-modulated ultrasonic sound is configured to frequency down-convert in the atmosphere to produce a specified audible sound for a bird at a selected distance away from the emitter.

A system for directing a bird away from equipment includes an emitter configured to transmit a beam of audio-modulated ultrasonic sound. The beam of audio-modulated ultrasonic sound is configured to frequency down-convert in the atmosphere to produce a specified audible sound for a bird at a selected distance away from the emitter.

A remotely positioned, ultrasonic wave producing, and low voltage anti-fouling system comprising; a computing module, a mounting system having a first end and a second end, wherein the first end is attached to vessel or a structure, a substantially waterproof enclosure detachably engaged with the second end of the mounting system, at least one transducer positioned within the substantially waterproof enclosure and cooperatively connected to the computing module, wherein the at least one transducer produces a sound wave able to impinge upon a submerged surface, at least one wave form generator cooperatively connected to the computing module and the at least one transducer, at least one power amplifier cooperatively connected to the at least one wave form generator and the at least one transducer, and at least one sensor cooperatively connected to the computing module, wherein the at least one sensor substantially.

A system for repelling a pet from at least one predetermined area includes a first device adapted for positioning at the predetermined area. The first device includes at least one of a first receiver and a first transmitter. A second device is adapted for placement on the pet. The second device includes at least one of a second receiver and a second transmitter. At least one of the first device and the second device is configured to warn the pet when the second device approaches the at least one predetermined area, and thereby train the pet to stay away from the predetermined area.

A system for repelling a pet from at least one predetermined area includes a first device adapted for positioning at the predetermined area. The first device includes at least one of a first receiver and a first transmitter. A second device is adapted for placement on the pet. The second device includes at least one of a second receiver and a second transmitter. At least one of the first device and the second device is configured to warn the pet when the second device approaches the at least one predetermined area, and thereby train the pet to stay away from the predetermined area.

An apparatus includes a base, a body coupled to the base and having slopped sidewalls, and imprinted glass marbles carried by the body. Each imprinted glass marble is configured to transmit terahertz frequencies from 300 GHz to 3 THz. The slopped sidewalls direct the transmitted terahertz frequencies above the body.

An apparatus includes a base, a body coupled to the base and having slopped sidewalls, and imprinted glass marbles carried by the body. Each imprinted glass marble is configured to transmit terahertz frequencies from 300 GHz to 3 THz. The slopped sidewalls direct the transmitted terahertz frequencies above the body.