A memory system of embodiments includes a container, a first circuit board, a second circuit board, and an optical cable. The container has a hole connecting inside and outside the container. The first circuit board is disposed outside the container and has a first circuit to convert a first electric signal to an optical signal. The second circuit board is disposed inside the container and has a memory device, and a second circuit to convert the optical signal into a second electric signal and storing the second electric signal in the memory device. The optical cable transmits the optical signal from the first circuit board through the hole to the second circuit board.

Provided are multiply-insulated articles, comprising at least first and second containers disposed together such that the interior volume of the first container is sealed against the environment exterior to the article.

Various systems may benefit from appropriate thermal protection. For example, various flight recorder systems may benefit from thermal isolation of a flight recorder memory core. A system can include a memory core of a flight recorder. The system can also include an inner chamber housing the memory core. The system can further include an outer chamber housing the inner chamber with a vacuum between the inner chamber and the outer chamber. The system can additionally include a signal path from avionics equipment to the memory core through the outer chamber and the inner chamber. The system can also include a power path for the memory core through the outer chamber and the inner chamber.

Various systems may benefit from appropriate thermal protection. For example, various flight recorder systems may benefit from a vacuum protected flight recorder memory. A system can include a memory core of a flight recorder. The system can also include an inner chamber housing the memory core. The system can further include an outer chamber housing the inner chamber with a vacuum between the inner chamber and the outer chamber. The system can additionally include a signal path from avionics equipment to the memory core through the outer chamber and the inner chamber. The system can also include a power path for the memory core through the outer chamber and the inner chamber.

An EM emitter includes at least three orthogonal coils driven by an oscillating voltage source, with the coils being electrically in parallel or series. When used in a vehicle, particularly an airplane, and the vehicle is lost, e.g., sinks, the emitter's EM signal passes through water with little attenuation and can be detected and the vehicle located.

A method for improving fire prevention performance of a vehicle-carried data recording device and a protection device thereof are provided, where the method includes: mounting the vehicle-carried data recording device in a water-proof shell in a sealing manner; mounting the water-proof shell in a mounting space enclosed by an upper constant-temperature water shell and a lower constant-temperature water shell; injecting a liquid into the upper constant-temperature water shell and the lower constant-temperature water shell; mounting a constant-temperature water shell composed of the upper constant-temperature water shell and the lower constant-temperature water shell in a fire-proof box; and packing the fire-proof box in a protective housing with heat dissipation holes to prevent a data recording device from being damaged when the vehicle is damaged by the action of an external force. The device is majorly encased by a water-proof shell, a constant-temperature water shell, a fire-proof box and a protective housing successively. The present disclosure has advantages of long fire resistance time and high data security.

Embodiments of the present disclosure disclose a Black box with Satellite Transmitter (BSAT) for underwater vehicles. The BSAT provides a mission data backup of sunken under water vehicles and it is akin to a black box recorder of aircrafts. The BSAT comprising a sealed enclosure to receive and transmit IR and electromagnetic signals, a Global Positioning System (GPS) with an antenna to provide GPS parameters of the BSAT, a transmit antenna to transmit the GPS parameters and parameters associated with the underwater vehicle, an ejection mechanism to eject the BSAT from the underwater vehicle on detecting a pre-defined condition, by an electronic controller. The electronic controller to perform at least one of sending control signals, communicating using IR transceiver, acquire and store underwater vehicle parameters, identifying an ejection instant, acquiring and storing data GPS parameters, scheduling data transmission through a satellite after ejection of the BSAT from the underwater vehicle.

A crash-protected memory unit (100) for a flight recorder comprises: an electronic memory (110), configured to store data; an active casing (120), configured to encase the electronic memory (110), and comprising a heat absorption material (125), adapted to absorb heat by undergoing an endothermic chemical process, thereby providing an active thermal insulation of the electronic memory (110); and a passive casing (130), configured to encase the active casing (120), and comprising a heat resistant material (135) for providing a passive thermal insulation for the electronic memory (110).