49results about How to "Good for long-distance transmission" patented technology

The invention discloses a laser optical disc-based digital inclined-angle sensor. The laser optical disc-based digital inclined-angle sensor comprises a housing, a fixing seat, two laser head assemblies and a turnplate, wherein the two laser head assemblies and the turnplate are arranged in the housing. The fixing seat is fixed on an upper of the housing. A circuit board is arranged in the fixing seat. The circuit board is provided with a microprocessor. The two laser head assemblies are connected to the microprocessor by two circuits. The two laser head assemblies are located below the fixing seat. The turnplate is located below the two laser head assemblies. The turnplate is fixed in the housing by a rotation shaft. The turnplate is provided with a pendulum bob. The periphery of the turnplate is provided with a round of reflector panels. Tops of the reflector panels are located behind the two laser head assemblies. The reflector panels are provided with multiple nicks. The laser optical disc-based digital inclined-angle sensor has the advantages of high resolution ratio, high precision, stable and reliable performances, good linearity, high signal-noise ratio, low influence caused by a temperature change, wide measuring range (360 degree), simple structure and low cost.

The invention discloses a single fiber bi-directional BOSA optical structure used for a high-speed transmit-receive system. A double-face discrete structure is employed, a central partition in a housing is employed to separate a transmitting terminal TOSA optical structure from a receiving terminal ROSA optical structure. A wavelength division multiplexing light composition structure in the TOSA optical structure and a wavelength division multiplexing optical structure in the ROSA optical structure are employed to carrying out light composition and light splitting on light beams, the TOSA optical structure and the ROSA optical structure share a refractive PBS combination prism, a light splitting PBS combination prism, and an optical port collimator, the light beam emitted from the optical port collimator is refracted by the refractive PBS combination prism towards the lower layer, and the fact that the TOSA light beam is separated from the ROSA light beam is achieved. By employing the above design, single fiber bi-directional transmission is achieved by means of one housing and one optical port, and therefore the single fiber bi-directional BOSA optical structure is advantaged by being simple in structure, low in insertion loss, relatively-high in coupling efficiency, easy to assemble and debug and relatively-small in size, and being capable of saving the cost, and has a good application prospect.

The invention provides a common-optical fiber transmission method for the multiuser quantum key distribution of power systems, which includes the following steps: a channel type in a WDM (Wavelength Division Multiplex) optical fiber is defined; wavelength allocation is carried out on each user; common-optical fiber transmission in multiuser quantum key distribution is implemented. The common-optical fiber transmission method for the multiuser quantum key distribution of the power systems which is provided by the invention solves the problem of incoordination in the process of transmitting quantum signals and synchronizing signals, thus reducing the signal crosstalk between the synchronizing signals and the quantum signals and between multiple users, reducing cost, and helping to promote the practice of quantum key distribution in private optical fiber power networks.

The invention provides a soil humidity sensor based on a frequency domain reflection principle, which can realize rapid soil moisture measurement in a single-point single-depth mode or a multi-point multi-depth mode within a certain area range. The frequency domain reflection-type soil humidity sensor adopts current or voltage output, can be connected with various testing devices conveniently; the current output has very strong anti-interference capability, which facilitates long-distance transmission. The frequency domain reflection-type soil humidity sensor is convenient for application; the sensor is only needed to be inserted into a PVC pipe which is embedded at a place to be detected in advance, and the measurement only needs several seconds. The frequency domain reflection-type soil humidity sensor manufactured according to figure 1 has the following function that through the measurement of a soil dielectric constant epsilon, the frequency domain reflection-type soil humidity sensor can realize rapid soil moisture measurement in a single-point single-depth mode or a multi-point multi-depth mode within a certain area range.

The invention discloses a high-power wireless charging device. The high-power wireless charging device is characterized in that a power supply accesses an LC electromagnetic resonance circuit sequentially by a bridge type rectification circuit and a high-frequency switch, an AD collection circuit collects current and voltage of the LC electromagnetic resonance circuit and then sends the current and voltage to a central processor by an RC filter circuit and a signal amplification circuit to form the transmitting end of the charging device; and a battery load accesses an electromagnetic resonance unit through a power supply management system, and the current and voltage signals of the battery load is fed back to the power supply management system by a collection unit to form the receiving end of the charging device. Due to the adoption of the circuit structure, the charging device has the advantages that 1, solving the problem that the wireless feed-back real-time property of the prior art is poor is solved by a high-voltage resonance manner; 2, the transmission distance of wireless power energy is lengthened; 3, the directivity of a magnetic field is strong, which is beneficial to distant transmission of wireless power energy; and 4, the harm on a human body is little.

The invention discloses a signal mixed processing type greenhouse temperature monitoring system based on the Internet of Things technology, which is characterized in that it is mainly composed of a substation system and a master station system connected to the substation system through a wireless network; the substation The system consists of a substation microcontroller, a buzzer connected to the substation microcontroller, a cycle frequency stabilization module, a signal processing unit, a refrigerator and an electric heater, a temperature sensor connected to the signal processing unit, and a cycle frequency stabilization module The connected first wireless transmission module is formed; the substation single-chip microcomputer is also connected with the first wireless transmission module; Keyboard and second-order filter circuit and so on. The second-order filter circuit of the present invention can filter the interference signal generated during the wireless transmission of the signal, so as to prevent the interference signal from affecting the control accuracy of the present invention.

The invention relates to an extreme ultraviolet-ray space remote communication system. The extreme ultraviolet-ray space remote communication system comprises an extreme ultraviolet pulse generation modulator, an extreme ultraviolet collimator, an extreme ultraviolet focuser and an extreme ultraviolet detection demodulator; the extreme ultraviolet pulse generation modulator is arranged on the focal point of the extreme collimator and used for modulating a to-be-transmitted digital signal, and the signal is output in an extreme pulse signal form; the modulated extreme pulse signal is transmitted in an orientation manner after being collimated by the extreme ultraviolet collimator; the extreme ultraviolet focuser is used for receiving the extreme ultraviolet pulse signal and focusing the extreme ultraviolet pulse signal, and the extreme ultraviolet detection demodulator which is arranged on the focal point of the extreme ultraviolet focuser is used for demodulating the extreme ultraviolet pulse signal to obtain the to-be-transmitted digital signal.

The invention discloses an optical fiber conduction type rotor flow sensor. The optical fiber conduction type rotor flow sensor comprises a circuit system, a parallel light source, a glass rotor flow meter, optical fiber coherent fiber bundles and a photosensitive diode array, wherein the optical fiber coherent fiber bundles are arrayed into an ordered vertical row in the axis direction of a glass tube and is contacted with the outer wall of the glass tube; the parallel light source and the optical fiber coherent fiber bundle array are located on the two sides of the glass tube; an optical fiber coherent fiber bundle array is located on the opposite side of the parallel light source; the length of the parallel light source is the same as that of the optical fiber coherent fiber bundle array; the optical fiber coherent fiber bundle array is composed of a vertical row of optical fibers; the row of the optical fibers is divided into m/2 groups; the arraying length of each group of the optical fibers is two times as much as the length of a floater; each group of the optical fibers is composed of n optical fibers and n is a positive integer; correspondingly, the photosensitive diode array is composed of n photosensitive diodes. The sensor disclosed by the invention has the following characteristics that a digital signal is output, the anti-jamming capability is strong, the resolution ratio is high, the performance is stable and reliable, the structure is simple and the cost is low.

The invention provides a soil humidity sensor based on a time domain reflection principle, and the soil humidity sensor can realize rapid soil moisture measurement in a single-point single-depth mode or a multi-point multi-depth mode within a certain area range. The time domain reflection-type soil humidity sensor adopts current or voltage output and can be connected with various testing devices conveniently; the current output has quite strong anti-interference capability, so as to be in favor of long-distance transmission. The time domain reflection-type soil humidity sensor is convenient to apply; the sensor is only needed to be inserted into a PVC pipe which is embedded at a detected place in advance, and the measurement only needs a short time of a few seconds. The time domain reflection-type soil humidity sensor manufactured according to the figure 1 has the following function that through the measurement of a soil dielectric constant epsilon, the time domain reflection-type soil humidity sensor can realize rapid soil moisture measurement in the single-point single-depth mode or the multi-point multi-depth mode within a certain area range.

The invention discloses a digital gas flow sensor comprises a circuit system, a laser source, a glass rotameter, fiber image bundles and photodiode arrays. The circuit system structurally comprises a microprocessor, a driver circuit, a signal processing circuit and a photodiode scanning circuit. The fiber image bundles are arranged in the axial direction of a glass tube to form a plurality of columns, a cylindrical lens is arranged between the glass tube and the fiber image bundles, the heads and tails of the columns are flush, and each column is formed through a plurality of vertical-arrayed fibers. Each column of the fibers corresponds to a group of the photodiode arrays, each photodiode array is formed through a plurality of photodiodes, and the fibers are connected to the photodiodes. The digital gas flow sensor has the advantages that digital signals are outputted, anti-jamming capability is high, resolution is high, performances are stable and reliable, structure is simple, and cost is low.

The embodiment of the invention discloses a device for improving the photo-communication reliability. The device comprises at least two different transmitting lenses, wherein the transmitting lenses comprise a first transmitting lens and a second transmitting lens; the spatial transmitting angle of the first transmitting lens is 1.3-1.7 milliradian; and the spatial transmitting angle of the second transmitting lens is 1.8-2.2 milliradian. The embodiment of the invention further discloses a system for improving the photo-communication reliability. By utilizing the device and the system which are disclosed by the invention, the light transmission range and the receiving power of a receiving terminal are increased and the photo-communication stability and reliability are improved on the premise of ensuring that a communication link is connected.

The invention discloses a digital photoelectric temperature sensor which comprises a temperature-sensing pipe (1), a photoelectric conversion module (2) and a digital processing module (3). The blind end of the temperature-sensing pipe (1) is a temperature-sensing head capable of being placed in a temperature field to be measured and generating heat radiation light beams. The photoelectric conversion module (2) comprises a light pipe (20), a focus lens (21), a light beam plate (22), a beam-limiting plate (23) and a photoelectric conversion element (24), wherein the focus lens (21), the light beam plate (22), the beam-limiting plate (23) and the photoelectric conversion element (24) are arranged in the light pipe (20). The digital processing module (3) comprises a module box body, a multi-section compensation adjustment submodule (31), a standard signal conversion submodule (32) and a network protocol conversion submodule (33), wherein the multi-section compensation adjustment submodule (31), the standard signal conversion submodule (32) and the network protocol conversion submodule (33) are arranged in the module box body. The light pipe (20) is formed by a first connection pipe (20A), a second connection pipe (20B) and a third connection pipe (20C). According to the digital photoelectric temperature sensor, the measurement accuracy is greatly improved by utilizing subsection error automatic compensation technique, and standard signal processing and network protocol conversion are utilized, thereby realizing digitization and networked transmission.

The invention discloses an environmental factor comprehensive monitoring system and method. The system is used for comprehensively monitoring the environmental factor data of rainfall, wind speed anddirection, negative oxygen ions, PM2.5, illuminance, temperature and humidity, transmits the processed environmental factor data to a base station in a wireless transmission manner, and comprises a rainfall detection module, a wind speed and direction detection module, a negative oxygen ion detection module, a PM2.5 detection module, an illuminance detection module, a temperature and humidity detection module, a data processing module and a data memory. According to the environmental factor comprehensive monitoring system provided by the invention, by integrating the plurality of environmentalfactor monitoring modules and the wireless transmission module, the integration level is high; by adopting a damp-proof circuit, the environmental factor comprehensive monitoring system can be applied to a damp forest environment; and by adopting a software compensation algorithm, the system can adapt to different climates and environments.

The invention discloses a digital inclination angle sensor based on a pascal principle. The digital inclination angle sensor comprises a shell, wherein the shell is internally provided with a circuit system, a suspended pendulum part, a hydraulic micro-displacement amplification part, a fiber optic image transmission bundle and a photosensitive diode array. The sensor has the following characteristics that digital signals are output, each induction element outputs a signal in a switching pulse way, 0 and 1 are used as the sampling data, the fuzzy components of a traditional analog quantity detecting way are avoided, the influences from various environment distribution parameters such as temperature, air pressure, electric fields and magnetic fields are avoided, the detection accuracy and reliability are greatly improved, and the digital inclination angle sensor is very high in resolution ratio and precision, simple in structure and low in cost.

The invention relates to a variable gain correlated double sampling circuit and a control method. The variable gain correlated double sampling circuit is provided with a switch K1, a switch K2, a switch K3, a switch K4, a switch K5, a switch K2_b, a switch K3_b, a switch K4_b, a switch K5_b, a capacitor C1, a capacitor C2, an operational amplifier OPA and a variable gain control module G, and is also provided with a circuit with a symmetrical structure: a node A' is symmetrical with the node A, a node B' is symmetrical with the node B, a node C' is symmetrical with the node C, a node D' is symmetrical with the node D, and a node E' and a node E are symmetrical; the circuit structure located at the in-phase input end of the operational amplifier is the same as the circuit structure located at the anti-phase input end of the operational amplifier, the in-phase output end of the operational amplifier outputs a signal VOUTP, and the anti-phase output end of the operational amplifier outputs a signal VOUTN. Parallel work of the sampling circuit and the holding and amplifying circuit is realized, pixel correction is not needed, and subsequent image processing work is simplified. And after the differential signal is amplified, the post-stage numerical quantization ADC index requirement is reduced.