36results about How to "Does not affect transmission performance" patented technology

The invention provides a protection circuit of a communication interface. The circuit includes: a first-level protection circuit, a second-level protection circuit and a third-level protection circuit connected in sequence, wherein: the first-level protection circuit includes a current discharge circuit, wherein the current discharge circuit It includes three connection ends, the first connection end is connected to the first signal line of the two signal lines of the RS-485 port, the second connection end is connected to the second signal line of the two signal lines of the RS-485 port, The third connection terminal is connected to the protective ground; the second-level protection circuit includes a first current-limiting resistor, a second current-limiting resistor and a bidirectional transient suppression diode; the third-level protection circuit includes a voltage discharge circuit, wherein the voltage discharge The amplifier circuit is connected to the communication ground, and one end is connected to the two signal lines of the RS‑485 port, and the other end is connected to the RS‑485 transceiver.

The invention discloses a single-fiber bidirectional transmission system based on mode division multiplexing. The single-fiber bidirectional transmission system based on the division multiplexing mainly comprises two optical signal input units, two optical signal output units and a mode division multiplexing and demultiplexing unit, wherein the mode division multiplexing and demultiplexing unit comprises two mode-type multiplexers which are connected through few-mode fiber. Polarization multiplexing optical signals are generated by the signal input units, the polarization multiplexing optical signals are enabled to be coupled into a mode field of the few-mode fiber by the mode-type multiplexer to finish the mode division multiplexing, the polarization multiplexing optical signals carried by the mode field are sent to the other mode-type multiplexer through the few-mode fiber, the received polarization multiplexing optical signals are enabled to be coupled into single-mode fiber by the other mode-type multiplexer and sent to the optical signal output units through the single-mode fiber, polarization diversity, mixing and balance detection are carried out on the received optical signals by the signal output units, then the received optical signals are changed into electric signals and then changed into digital signals. According to the single-fiber bidirectional transmission system based on the mode division multiplexing, the few-mode fiber is used for overcoming Rayleigh backward scattering effect, single-fiber bidirectional transmission is achieved, and use efficiency of optical fiber and wavelength resources is improved.

The invention discloses a testing device based on conformal antenna design in a high-explosion and high-pressure environment. The testing device is characterized by comprising a sealing cover conformal antenna, a sealing ring, a testing module, a battery and a protecting device, wherein the sealing cover conformal antenna serves as an upper cover of the protecting device and is matched with the protecting device, the sealing ring is arranged between the sealing cover conformal antenna and the protecting device, the testing module is located in the protecting device, and the battery is arranged in the protecting device. The design of the testing device for performance parameters of missiles and the like in a high-explosion and high-pressure environment can be simplified, real-time parameter acquisition and processing can be achieved, testing cost can be lowered, and testing efficiency can be improved.

The invention discloses a hinge structure with a signal transmission line. The hinge structure comprises at least two rotating vanes and two parallel rotating vane connecting pieces arranged between the two adjacent rotating vanes, i.e. a first rotating vane, a second rotating vane, a first rotating vane connecting piece and a second rotating vane connecting piece, wherein the first and second rotating vanes are connected through the first and second rotating vane connecting pieces in a rotating manner; each rotating vane connecting piece comprises at least two parallel signal transmission channels; the signal transmission channels in each rotating vane connecting piece are in S-shaped connection; a signal of a first unit connected with the first rotating vane can be transmitted into a second unit connected with the second rotating vane. According to the hinge structure with the signal transmission line, the signal transmission channels are designed as in the S-shaped connection, so that the signal transmission channels are perpendicular to a rotating direction, are namely parallel to the hinge structure, and are not likely to be bent along with bending of the hinge structure, influence on transmission performance of the signal transmission line is eliminated, and long service life is ensured.

Provided is a trigger optical cable applied to the field of ultra-high voltage power transmission. The trigger optical cable applied to the field of the ultra-high voltage power transmission comprises a core layer, a wrapping layer, a coating layer, a tight wrapping layer, a reinforced layer and an outer protective layer from inside to outside in sequence. The core layer is of a solid structure, the wrapping layer wraps the outer wall of the core layer, the coating layer wraps the outer wall of the wrapping layer, the tight wrapping layer wraps the outer wall of the coating layer, the reinforced layer wraps the outer wall of the tight wrapping layer, and the protective layer wraps the outer wall of the reinforced layer. The tight wrapping layer is made of Hytrel materials of flame-retardant level, the outer protective layer is made of fluoroplastics, the reinforced layer is filled with aramid fibers, and the refractive index of the core layer is larger than that of the wrapping layer. The trigger optical cable applied to the field of the ultra-high voltage power transmission does not influence the transmission performance of the optical cable in the near-infrared band in an 800nm-1400nm range under the premise that the ultra-high voltage endurance level and the flame-retardant level of the whole product are ensured, and is resistant to corrosion, resistant to high low temperature, inflaming retarding, insulative, resistant to ultra-high voltage, resistant to treading and free of damage.