44results about How to "Not subject to electromagnetic interference" patented technology

The invention relates to the technical field of water leakage detection and in particular relates to a water leakage detection positioning system and a water leakage detection positioning method. The system comprises a power supply, a positioning induction line, a positioning power supply line and an auxiliary power line, wherein the positioning power supply line is connected to two ends of the positioning induction line; the front end of the positioning induction line is connected with one pole of the power supply; the front end of the auxiliary power line is connected with the other pole of the power supply; the tail end of the positioning power supply line is separated from the tail end of the auxiliary power line; the positioning induction line and the positioning power supply line are not conducted with the auxiliary power line in a water leakage-free state, and the positioning induction line is conducted with the auxiliary power line in a water leakage state through a water leakage point. According to the detection method, the current flowing through the positioning induction line reaches an auxiliary induction line through the water leakage point is detected, so that the water leakage point is positioned by combining the length L of the positioning induction line. According to the system, the positioning accuracy and reliability of the water leakage point are effectively improved, and the cost of the system is greatly reduced.

The invention discloses a time measuring device and method after a target projectile is intercepted and impacted. The time measuring device comprises a light emitting unit, an optic fiber sensing network, a photoelectric detecting unit, a data collecting and processing unit and a calculating module; the light emitting unit emits a light signal; the optic fiber sensing network transmits the light signal to the photoelectric detecting unit; the photoelectric detecting unit converts the light signal into an electrical signal and outputs the light-transmission state; according to the light-transmission state, the data collecting and processing unit reports the data frame matched with the light-transmission state in the fixed time interval Tau; and the survival time T1 and the hit moment T2 ofthe target projectile in the collision process are calculated according to the type and quantity of the data frame by the calculating module. According to the time measuring device and method after the target projectile is intercepted and impacted, calculation of the survival time and the hit moment of the target projectile are realized, and the time measuring device and method has the advantagesof being wide in frequency bandwidth, free from electromagnetic wave interference, small in size, small in weight, high in winding, resisting in corrosion and low in cost, measuring for the target projectile in the interception process is complete and comprehensive, and supporting for inversion of the damage process is provided.

The invention discloses a large-scale altered lithofacies location prediction method for hydrothermal deposits, which consists of three stages of work including fine analysis of ore-forming structures, altered lithofacies mapping, altered lithofacies zoning and concealed ore location prediction program, to predict the direct location of deep deposits or ore bodies. This method solves the problem that the conventional physical and chemical prospecting method is difficult to predict deep hidden ore bodies due to the strong anomaly multi-solution and the difficulty in positioning in the whole space domain.

The invention discloses a pneumatic steering adjusting mechanism of a car lamp. The pneumatic steering adjusting mechanism comprises a reflecting cover, a light transmitting mirror, a mounting shaft, a lamp holder, an adjusting guide column, a guide column fixed frame, an air conveying pipe and a valve. The reflecting cover is of a U-shaped structure, and the light transmitting mirror is fixed to an opening of the reflecting cover; the mounting shaft is located in the reflecting cover, the lamp holder is fixedly arranged in the reflecting cover, and the mounting shaft is movably sleeved with the lamp holder; the adjusting guide column is fixedly connected with the arc-shaped end of the reflecting cover and is in a circular arc shape, and the round center of the adjusting guide column is located at the axis of the mounting shaft; the guide column fixed frame is provided with an arc-shaped airtight sliding groove matched with the adjusting guide column; and one end of the air conveying pipe is communicated with the airtight sliding groove, and the other end of the air conveying pipe is led out and is connected with the valve. The pneumatic steering adjusting mechanism of the car lamp achieves the steering adjusting function of the car lamp in a pneumatic manner, so that an electronic control circuit is prevented from being used. Electromagnetic interference does not exist, and the mechanism cannot generate electromagnetic interference.

The invention discloses a liquid core angle sensor, which comprises a closed hose filled with liquid and two optical fibers, the refractive index of the liquid is less than or equal to the refractive index of the hose, one end of the two optical fibers is placed outside the hose, The other end is placed in the liquid of the hose, the end faces of the two optical fibers placed in the liquid are facing each other and do not touch, and the two optical fibers can be coupled through the liquid. The sensing position of the liquid core angle sensor of the present invention is located between the end faces of the two optical fibers inserted into the hose. The input light enters one of the fibers, couples to the other fiber through the liquid in the hose, and exits the detector through this fiber. When the hose is bent, the coupling state of the two optical fibers changes, and the output light intensity decreases. By establishing a one-to-one correspondence between the light intensity change and the angle, angle sensing is realized. The invention has the characteristics of high sensitivity, good repeatability, strong robustness and anti-electromagnetic interference, and the measurement range and measurement accuracy can be adjusted.

The invention discloses a front-end signal synthesis module for an accelerator low-level control system, comprising: a reference working signal generating unit, an intermediate frequency signal generating unit, a local oscillator signal generating unit and a clock signal generating unit; a reference working signal generating unit and The output end of the intermediate frequency signal generating unit is connected with the input end of the local oscillator signal generating unit; the output end of the intermediate frequency signal generating unit is connected with the input end of the clock signal generating unit; the present invention adopts a frequency multiplication and frequency division parallel structure, wherein, a The structure is a parallel reference working signal generation unit and an intermediate frequency signal generation unit, and the secondary structure is a parallel local oscillator signal generation unit whose internal function is frequency mixing and a clock signal generation unit whose internal function is 4 times frequency. This structure can not only ensure the coherence between the local oscillator signal, the clock signal and the reference working signal, but also can obtain a larger frequency range while overcoming the problem of cascaded noise.

The invention discloses a micro-fluidic chip flow velocity sensor based on micro-nano optical fibers. The micro-fluidic chip flow velocity sensor comprises a micro-fluidic chip, micro-nano optical fibers and a flexible thin film, the thickness of the flexible thin film is smaller than or equal to 100 microns, a refractive index of the flexible thin film is smaller than that of the micro-nano optical fiber, the flexible film coats a fluid channel of the micro-fluidic chip, the flexible film is provided with openings at an inlet and an outlet of the fluid channel respectively, a stretching partof the micro-nano optical fiber stretches across the fluid channel at the to-be-measured position of the fluid channel, and the stretching part of the micro-nano optical fiber, a tapering transition area and non-stretching parts at the two ends are partially embedded in the flexible film. When fluid in the fluid channel flows, the flexible film is bent outwards under pressure, and due to the increase of the bending loss of the micro-nano optical fiber, an output light intensity signal is reduced accordingly, so that flow velocity sensing is realized. According to the invention, multi-point flow velocity detection can be realized, flow velocity detection can be carried out on an existing micro-fluidic chip, and high-sensitivity flow velocity sensing is realized.