35results about How to "Strong electrical signal" patented technology

The invention relates to the field of image sensors, and discloses a wide-dynamic range image sensor and a control method thereof. According to the invention, a plurality of photoreceptors and a plurality of transfer transistors are arranged in each pixel; in each integration period, the photoreceptors are sequentially connected with a floating diffusion area according to a preset time sequence respectively, the photoreceptors are sequentially read, and the other photoreceptors are integrated in the reading process of a certain photoreceptor, so that concurrent integration can shorten total operation time and increase the operating speed of the image sensor in a wide-dynamic range operating mode; and a structure with two layers of micro lenses is adopted, so that each photoreceptor in the same pixel can sample optical signals of the same point, and the optical signal detection accuracy of the image sensor is improved.

The present invention discloses a silk-screen printing electrode sensor preparation method based on ionic liquid-multi-wall carbon nano-tube modification, and belongs to the technical field of biological sensors. According to the method, an ionic liquid-multi-wall carbon nano-tube nanometer material is prepared and then coats the surface of a silk-screen printing carbon electrode in a dropwise manner, and then acetylcholine esterase coats the surface of the ionic liquid-multi-wall carbon nano-tube nanometer material modified silk-screen printing work electrode in a dropwise manner so as to prepare the acetylcholine esterase biological sensor for detecting organic phosphorus and carbamate pesticides. According to the present invention, the prepared sensor has characteristics of simple process, easy operation, low cost, high detection sensitivity, strong electrical signal and simple electrode pretreatment, and is suitable for detection of pesticide residues, wherein the detection limit is 0.05 [mu]g/L.

The invention discloses a wafer level packaging method. The wafer level packaging method includes that providing a substrate, wherein the substrate has a front surface and a back surface, and an interlevel dielectric layer and a welding pad located on the interlevel dielectric layer are formed in the front surface; forming a first through hole in the back of the substrate, wherein the interlevel dielectric layer exposes out of the first through hole; forming a polymer layer at each of the back surface of the substrate and the side wall of the first through hole; etching the interlevel dielectric layer, and etching to remove the polymer layers when etching the interlevel dielectric layer; repeating the steps of forming the polymer layer at each of the back surface of the substrate and the side wall of the first through hole, etching the interlevel dielectric layer, and etching to remove the polymer layers when etching the interlevel dielectric layer till exposing the welding pad, and forming a second through hole. According to the technical scheme, when etching the interlevel dielectric layer, the polymer layers protect the back of the substrate and the side wall of the first through hole from damage, the surfaces of the back of the substrate and the side wall of the first through hole are smooth, the electrical signals of wires in the second through hole are good, and the performance of the packaging structure is good.

The invention discloses a preparation method and an application of a sensor based on a screen-printed carbon electrode and belongs to the technical field of biological sensors. The method comprises steps as follows: a dicyclohexyl phthalate/ multiwalled carbon nanotube nano material is prepared and dripped on the surface of the screen-printed carbon electrode layer by layer, then acetylcholine esterase is dripped on the screen-printed work electrode surface modified with a dicyclohexyl phthalate/multiwalled carbon nanotube, and the acetylcholine esterase biological sensor for detecting organophosphorus and carbamate pesticides is prepared. The prepared sensor has the characteristics of simple work procedure, convenience in operation, low cost, high detection sensitivity, strong electric signal and simplicity in electrode pre-treatment and is applied to detection of pesticide residues, and the detection limit reaches 0.05 mu g/L.

The invention discloses a gene sequencing method capable of increasing the signal-to-noise ratio by detecting pyrophosphoric acid charges. According to the method, by adding dNTP, polymerases and catalysts to a reaction system, pyrophosphoric acid is released through base pairing, pyrophosphoric acid is hydrolyzed to generate hydrogen phosphate ions, and the hydrogen phosphate ions are combined with sensor surface receptors to generate electrical signals which are further translated into corresponding bases. Pyrophosphoric acid generated during amplification can be detected, the diffusion rate of pyrophosphoric acid is much slower than that of hydrogen ions because the relative molecular mass of pyrophosphoric acid is 174, electrical signals which can be detected last for a long time, and accuracy can be effectively improved. Besides, pyrophosphoric acid has four positive charges, diffusion is slowed down, effective surface concentration is high, the converted electric signals are strong, and the detected signal-to-noise ratio is high. The high signal-to-noise ratio allows the use of smaller sensors and a sensor array with higher density and larger scale, so that sequencing throughput can be further improved and sequencing cost can be reduced.

The invention discloses an electrochemical immunosensor electric signal marker for prostate specific antigen detection. The electric signal marker is protease, and a catalytic substrate of the protease is polypeptide with the sequence characteristic that the third amino acid from a cleavage site to a carbon end is histidine H. A detection method for prostate specific antigen detection adopts the electrochemical immunosensor electric signal marker for prostate specific antigen detection. The method comprises the steps as follows: A, preparing a secondary antibody/carbon nanotube/protease compound; B, preparing a working electrode; C, soaking the working electrode in a PBS solution containing copper ions and the polypeptide substrate for 2 h, and conducting an electrochemical test with linear sweep voltammetry. The electrical signal marker has obvious electrical signals, can meet the requirement of detection of concentration of prostate specific antigens in human serum and is harmless toworkers and environments due to the fact that no biphenyl substances are used in the catalytic substrate.

A design method for a condensing element for improving an illumination system of a grating reading head belongs to the technical field of optics. According to the method, the size of light source is reduced, electric signals can be stably output, and the resolution and precision of a grating measuring device can be increased. The method includes the following steps: the position of the condensing element is first determined, i.e., the condensing element is between the light and a collimating lens, and is on the same optical axis as the illumination system of the grating reading head; according to the specific structure of the grating reading head and the mounting position of the condensing element, the size of the light passing through the condensing element is determined; and according to the actual size of the light source, the size of the light passing through the condensing element and the maximum incidence half-angle of the light capable of being received by the condensing element, the axial length and focal length of the condensing element are determined. The luminous flux of the light is increased, and the electric signals outputted by the illumination system of the grating reading head are strong; the collimation and parallelism of the emergent light passing through the condensing element are high; when the illumination system is used for measuring a grating scale, the measurement precision is high, and response speed is high.

The invention relates to a linear grating scale of a numerical control machine tool. The linear grating scale of the numerical control machine tool comprises a number reading head and a grating scale body. The linear grating scale of the numerical control machine tool is characterized in that the grating scale body is provided with two rows of grating lines, namely, a first row of grating lines and a second row of grating lines; the first row of grating lines is scaled at equal distance, so is the second row of grating lines; the scaling distance of the first grating lines is greater than that of the first row of grating lines; pulse is between the first row of grating lines and the second row of grating lines. According to the linear grating scale of the numerical control machine tool, the method that two rows of A-B-phase grating lines are scaled at every 100 microns and are staggered in 10 microns is adopted, and the effective working grating torque is 10 microns, so that the manufacturing difficulty can be greatly reduced, and the oil-water pollution resistance can be effectively improved; the anti-interference performance of pulse signals generated by a photoelectric cell unit is high. The linear grating scale is high in novelty and creativity and high in practical value.

The invention provides a magnetostrictive biosensor driving device. A DC solenoid coil is wound on an iron core, the upper end of the iron core is fixed on a coil mounting seat, an AC flat coil is fixed on the coil mounting seat, the AC flat coil is is arranged in parallel with a magnetostrictive biosensor, the magnetostrictive biosensor is fixed on a sensor mounting seat, the coil mounting seat is fixed on a first shell, and the sensor mounting seat is fixed on a second shell. According to the magnetostrictive biosensor driving device provided by the invention, a driving magnetic field is changed by adjusting the current, a driving coil can be separately modified according to different AC and DC magnetic field requirements, thereby reducing the repeated modifications and the input cost ofthe hardware circuit drive; and by reducing the use of permanent magnets, precise control of the magnetic field can be achieved to achieve optimal electrical signals.

The invention discloses a preparing method for a modified graphene oxide-piezoelectric polymer energy-storing thin-film device. According to the preparing method, at first, a thin-film material is prepared, perfluoro nitrine benzoic acid and graphene oxide are subjected to a covalent reaction through heating so that micro-molecular modifying agents can be connected to the surface of modified graphene oxide, then the modified graphene oxide is washed cleanly through ethyl alcohol, frozen, dried, and then dispersed in N, N-dimethylformamide in an ultrasonic mode, a certain quantity of polyvinylidene fluoride-hexafluoropropylene copolymers is added, the mixture is heated and stirred, a tape-casting method is used for preparing a composite thin film, after heating is carried out to remove solvent, the thin film is cooled and recrystallized, then the thin film and a substrate are soaked in water, and the thin film is taken down; finally, the prepared thin film is prepared into the device, two pieces of copper foil are connected to the upper face and the lower face of the thin film respectively to serve as current collectors, wires are led out of the copper foil, or the copper foil can be directly connected with a test instrument for testing, and namely the flexible thin-film device integrating an electricity generation ability and an electricity storage ability is prepared.

The invention discloses a preparation method and application of an MOF-based plant leaf friction nano-generator. The preparation method comprises the following steps: washing a substrate clean, preparing a copper acetate solution, and mixing a tetrafluorophthalic acid solution and a triethylene diamine solution to obtain a mixed solution A; spraying a copper acetate solution, the mixed solution A and absolute ethyl alcohol on the surface of a substrate, wherein the copper acetate solution, the absolute ethyl alcohol, the mixed solution A and the absolute ethyl alcohol are sequentially sprayed; after each solution is sprayed, using a fan with a heating function for evaporating absolute ethyl alcohol on the surface of the substrate; and repeatedly spraying for a plurality of times to obtain the MOF-based plant leaf friction nano-generator. The nano-generator has the advantages of being easy to prepare, good in biocompatibility, high in sensitivity and free of batteries, can stably work for a long time, and is an excellent substitute of a traditional wind speed sensor.

The invention discloses a heart rate recognition device. The heart rate recognition device comprises an upper pressing plate, a lower base plate, a piezoelectric panel and a buffer layer; the upper pressing plate comprises an upper pressing plate panel and a first bulge group which is positioned on the lower side of the upper pressing plate panel and is provided with a plurality of vertically downward first bulges; the lower base plate comprises a lower base plate panel which is positioned below the upper pressing plate and is parallel to the upper pressing plate panel, and a second bulge group which is positioned on the upper side of the lower base plate panel and is provided with a plurality of vertically upward second bulges; the piezoelectric panel is clamped between the first bulge group and the second bulge group; and the buffer layer is located among the upper pressing plate, the lower base plate, and the piezoelectric panel. The heart rate recognition device has the beneficial effects that through a plurality of first contact faces and a plurality of second contact faces which are located on the upper side and the lower side of the piezoelectric panel and arranged in a staggered mode, the piezoelectric panel deforms multiple times, so that superposition of multiple electric signals is formed, the stronger electric signals can be output under the condition of bearing the same pressure, and heart rate recognition is more accurate.

The invention discloses an energy-saving illumination voltage stabilizer, which relates to the field of electrical engineering. The energy-saving illumination voltage stabilizer comprises a shell and a body, wherein the body is internally provided with a resistive power-saving circuit, a power-saving voltage detection circuit, an electric motor control circuit and a protection circuit, wherein the resistive power-saving circuit is connected with the power-saving voltage detection circuit and the electric motor control circuit in parallel and is connected with the protection circuit in series, the power-saving voltage detection circuit is connected with the electric motor control circuit and the protection circuit in series, the power-saving voltage detection circuit, the electric motor control circuit and the protection circuit adopt nanocarbon materials as circuit materials, the energy-saving illumination voltage stabilizer is internally provided with a compensation circuit, and the compensation circuit is respectively connected with the electric motor control circuit and the power-saving voltage detection circuit. The nanocarbon materials are used as the circuit materials due to good superconductivity and toughness of the nano materials, the resistance is small, the electric signal is strong, the energy-saving illumination voltage stabilizer is not likely to break, the cost is low, air pollution cannot be caused, energy-saving and environment-friendly effects are realized, the compensation circuit can be regulated according to a signal of the power-saving voltage detection circuit, the energy consumption can be reduced, the starting voltage can be regulated to be 231V, the stabilized voltage can be regulated to be 198V, and the service life of a lamp can be prolonged.