10 results about "Crystal filter" patented technology

The crystallization purification preparation system for 2, 6-dimethylnaphthalene comprises a suspension stirring crystallizer and a crystal filter, the suspension stirring crystallizer is connected to one end of the crystal filter, and the other end of the crystal filter is connected with a residual liquid tank and a static crystallizer; a mother liquid tank and a finished product tank are arranged on the first pipeline between the static crystallizer and the crystal filter; meanwhile, the residual liquid tank, the mother liquid tank and the static crystallizer are also respectively connected with a waste removal and discharge pipeline; wherein the suspension stirring crystallizer is connected with a cooling and heating all-in-one machine through a cooling and heating medium pipeline, and the static crystallizer is also connected with the cooling and heating all-in-one machine through the cooling and heating medium pipeline. According to the method, high-purity 2, 6-dimethylnaphthalene is obtained from low-value petrochemical raw materials by adopting a crystallization purification method.

The utility model discloses a miniature crystal filter, and relates to the technical field of wireless communication. The filter comprises a filter base and a filter core group, the filter base comprises a metal substrate and a metal lead column, and the metal lead column penetrates through the metal substrate; the filter core group comprises a printed circuit board, a chip capacitor, a crystal resonator and a magnetic ring; and the printed circuit board is welded with the metal lead columns. The filter core group is vertically mounted, and the chip capacitors are assembled at positions reserved between the left and right ends of the upper-layer plate and the two columns of crystal resonators, so that the capacitors and the crystal resonators are in the same plane, and the height space consumption of the filter is reduced.

The application discloses a preparation method of high-purity needle-shaped sodium sesquicarbonate crystals and relates to the technical field of inorganic salt crystallization treatment. The sodium sesquicarbonate crystal mother liquor is prepared by dissolving sodium carbonate and sodium bicarbonate, a complex additive composed of polyvinylpyrrolidone and sodium dodecyl sulfate is added into the crystal mother liquor, and crystallization is carried out under the synergistic action of pulse ultrasonic waves, so that needle-shaped sodium sesquicarbonate crystal slurry with a high length-diameter ratio is obtained. After solid-liquid separation, the obtained needle-shaped sodium sesquicarbonate crystal filter cake is washed by anhydrous ethanol under low-temperature conditions, residual moisture among the crystals and on the crystal surface is replaced, the crystals washed by anhydrous ethanol are placed in a supercritical carbon dioxide environment for static drying, the whole-chain anti-agglomeration protection of the needle-shaped sodium sesquicarbonate crystals from crystallization growth to the final dried products is realized, thermal decomposition of the sodium sesquicarbonate is avoided, and the method is suitable for high-quality industrialized preparation of thermosensitive hydrated salts.

Hybrid lattice filters with acoustic baluns are disclosed. In one aspect, a hybrid lattice filter may be formed using acoustic elements. The hybrid lattice filter may operate with acoustic baluns such as coupled resonator filters (CRF) or stacked crystal filters (SCF). To achieve the desired common mode rejection, an additional rejection or low common mode intermediate impedance network may be supplied between the acoustic balun and the hybrid lattice filter. By combining the acoustic balun with the low common-mode intermediate impedance network and the hybrid lattice filter, a passband filter with a desired bandwidth may be created.

The invention provides a miniaturized wide-passband narrow-stop-band quartz crystal filter and a processing method thereof, and belongs to the technical field of filters, and the method comprises the steps: determining the shape and size of a wafer according to the size and technical parameters of a preset target filter; designing an A-surface electrode and a B-surface electrode which are matched with each other; a surface electrode A and a surface electrode B are coated on the wafer, and the electrodes are fine-tuned and packaged after being connected. According to the processing method provided by the invention, the miniaturized wide-passband and narrow-stop-band quartz crystal filter can be produced through the design of the wafer size and the electrodes, and the problem that the traditional wide-passband and narrow-stop-band filter can only be realized by adopting a combined filter formed by combining a plurality of large-size monolithic quartz crystal filters is solved.

The invention discloses an optical fiber type natural light illumination system for agriculture and light complementation application. The optical fiber type natural light illumination system comprises a bionic light energy collection layer, a light source layer and a light source layer, according to the intelligent light transmission layer, photosensitive liquid crystal adjusts the refractive index to optimize a light path according to light intensity data; when light attenuation of a main channel exceeds a threshold value, a standby channel is automatically switched, a shape memory alloy spring compensates temperature deformation, compressed air periodically cleans an optical fiber end face, optical fiber total reflection light is transmitted to the position below a photovoltaic panel, and then light below the panel is reflected to the ground and crops. According to the precise light regulation and control layer, a multispectral camera monitors crop canopy spectrum to generate a dynamic light formula, a photonic crystal filter decomposes wave bands, a micro-lens array is shaped into rectangular light spots, and surplus light energy is converted into electric energy to be used for power supply of agricultural monitoring equipment at night or emergency lighting in extreme weather. And the ecological collaboration layer is used for collecting environmental parameters and crop physiological indexes, calculating an optimal light intensity / spectrum and temperature and humidity threshold range, generating a differentiated regulation and control instruction and continuously monitoring a regulation and control effect.

This invention discloses an automatic testing system for quartz crystal filters based on a vector network analyzer, belonging to the field of electronic testing and measurement technology. It includes a frequency path recording module, an offset identification module, a backtracking reconstruction module, a rhythm alignment module, and a curve output module. The frequency path recording module acquires response change data corresponding to each frequency position during the frequency sweep process and records the correspondence between each frequency position in the sweep sequence, forming a frequency position change record. By constructing a frequency position change record and tracking the correspondence, this invention maintains a true correlation between frequency position and response change data during the frequency sweep process, and achieves abnormal segment identification and data recovery during sequential offsets, avoiding performance parameter calculation deviations. Simultaneously, through backtracking and rhythm alignment, the response change process is made continuous and consistent, and the performance curves are rearranged for all frequency positions, thereby improving the accuracy and stability of the test results.

The invention belongs to the technical field of crystal filter design, and particularly relates to a single-chip high-integration crystal filter, which comprises a chip, and an input end crystal resonance unit group and an output end crystal resonance unit group which are arranged on the chip, the input end crystal resonance unit group comprises a rectangular electrode A and a rectangular electrode B which are arranged on the upper surface of the wafer, and a rectangular electrode C arranged on the lower surface of the wafer; the output end crystal resonance unit group comprises a rectangular electrode D and a rectangular electrode E which are arranged on the upper surface of the wafer, and a rectangular electrode F arranged on the lower surface of the wafer; a signal of the input end passes through the input end crystal resonance unit group, then enters the output end crystal resonance unit group in series, and finally is transmitted to the output end; according to the invention, high performance can be ensured while the compact size of the filter is maintained.

This invention discloses a chemically strengthened glass surface treatment device, relating to the field of chemically strengthened glass production technology. It includes a salt bath tank and a crystal filter assembly. Guide rails are provided on both sides of the inner wall of the salt bath tank. The crystal filter assembly includes a floating frame slidably connected to the surface of the guide rails via guide wheels. A limiting frame is provided at the bottom of the guide rails on the inner wall of the salt bath tank. Lifting support plates are fixed on both sides of the top surface of the floating frame, and the surfaces of the lifting support plates are used to support a basket loaded with glass. This chemically strengthened glass surface treatment device utilizes the gravity of each batch of glass undergoing chemical strengthening to press down the floating frame. A filter plate rotates to a horizontal position, closing the hollow part of the floating frame to filter the solution, causing the solution to rise to the upper strengthening chamber, while the crystallizing slag is pressed down and collected in the lower processing chamber. This ensures the purity of the solution during each batch of glass undergoing chemical strengthening, preventing excessive crystallizing slag content in the solution from affecting the chemical strengthening effect of the glass.

The utility model relates to sodium chlorate evaporation crystallizer technical field discloses a sodium chlorate evaporation crystallizer with crystalline particle screening function, including crystallization pipe, the bottom of crystallization pipe is installed with no. The bottom of no. The bottom of no. The bottom of no. The top of crystallization pipe is installed with evaporation chamber. The utility model discloses through setting crystal filter structure, the crystal particle that crystallization pipe inside production uses the filter of no. The bottom of no. The bottom of no. The bottom of no. The top of crystallization pipe is installed with evaporation chamber. The utility model discloses through setting crystal filter structure, the crystal particle that crystallization pipe inside production uses the filter of no. The bottom of no. The bottom of no. The bottom of no. The top of crystallization pipe is installed with evaporation chamber.