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4 results about "Capacitance probe" patented technology
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Capacitance sensors (or Dielectric sensors) use capacitance to measure the dielectric permittivity of a surrounding medium. The configuration is like the neutron probe where an access tube made of PVC is installed in the soil; probes can also be modular (comb-like) and connected to a logger. The sensing head consists of an oscillator circuit, the frequency is determined by an annular electrode, fringe-effect capacitor, and the dielectric constant of the soil. Each capacitor sensor consists of two metal rings mounted on the circuit board at some distance from the top of the access tube. These rings are a pair of electrodes, which form the plates of the capacitor with the soil acting as the dielectric in between. The plates are connected to an oscillator, consisting of an inductor and a capacitor. The oscillating electrical field is generated between the two rings and extends into the soil medium through the wall of the access tube. The capacitor and the oscillator form a circuit, and changes in dielectric constant of surrounding media are detected by changes in the operating frequency. The capacitance sensors are designed to oscillate in excess of 100 MHz inside the access tube in free air. The output of the sensor is the frequency response of the soil’s capacitance due to its soil moisture level.
Transmission line with electrical length markings and method of continuous marking of transmission lines, transmission line assembly
The present invention discloses a transmission line with electrical length markings, its continuous marking method, and a transmission line assembly. On the outer surface of the transmission line, a plurality of electrical length markings with intervals are formed along the length direction of the transmission line itself. The distance between adjacent markings corresponds to the propagation distance of the signal within a preset time unit d. The electrical length τ satisfies τ = (n - 1)·d + ε, where n is a natural number greater than or equal to 2, 0 ≤ ε < d, and the number of markings corresponds to the integer index n. During manufacturing, the continuous wire is placed on a production line with tension control, the displacement is measured by a grating, and the phase is measured by a non-contact capacitive probe in cooperation with a vector network analyzer. The electrical length at each position is calculated, and the marking module is driven at a d interval to continuously mark and shipped in rolls. In this way, the electrical length of the transmission line can be identified, recorded, and circulated. During assembly, it is cut according to the physical length or electrical length. The number of electrical length markings N of each wire segment is equal to each other, and the electrical length markings at both ends are aligned, so as to achieve the consistency of the propagation time between differential pairs and between multiple channels.
Owner:HEIFEI INTERCONNECT HOLDINGS LTD
Multi-cyclone dual-chamber on-line moisture rapid detection system
The application discloses a multi-cyclone double-cavity online water content rapid detection system and belongs to the technical field of material water content online detection. The system comprises a bypass sampling and winnowing module and a multi-cyclone parallel collection module. The multi-cyclone parallel collection module and the double-test cavity module are used in cooperation, the multi-cyclone separator cone is collected in parallel and staggered, and double-cavity alternate testing is performed, so that the time waste caused by waiting for discharging in the traditional single-channel method is eliminated, the whole detection process can continuously and uninterruptedly run, near real-time high-frequency water content output is realized on low-cost hardware, the equivalent sampling interval is compressed to sub-second level, fast process control is met, the testing accuracy is ensured, the water content probe is used, the traditional resistance / capacitance probe is adopted, the cost is greatly reduced compared with an infrared / microwave moisture meter, and the water content probe can be quickly replaced.
Owner:SHENYANG YUANDA TECH IND
A gas-liquid-solid three-phase circulating fluidized bed cold model experimental device
The utility model discloses a kind of gas-liquid-solid three-phase circulating fluidized bed cold model experimental device, belong to fluidized bed experimental device technical field.The experimental device mainly includes liquid inlet, reaction tube, gas inlet, liquid outlet, gas-liquid separator, gas outlet, particle conduit, stock bin, screw feeder, conveying pipe, liquid-solid separator, conveying liquid outlet, filter, conveying liquid inlet, discharge port and discharge valve.Gas in the experimental device is in the form of bubble and moves upward and contacts with liquid-solid phase countercurrent, improves interfacial contact efficiency, liquid-solid phase moves downward, backmixing is small, and spiral feeder can be used to accurately control particle circulation rate;With pressure sensor, capacitance probe, optical fiber probe, high-speed camera and other test instruments, the stability of device can be used to study operating mechanism, reveal multiphase flow distribution in reactor, provide solid data and theoretical support for structure optimization and industrial application of the type reactor.
Owner:DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES