38results about How to "Adjustable magnification" patented technology

The invention discloses a high-strength mining expansion filling fireproofing and extinguishing material and an application method thereof. The material comprises the following substances in parts by weight: 16-25 parts of aluminate cement clinker, 12-20 parts of Portland cement clinker, 4-16 parts of active calcic material, 6-15 parts of setting accelerator, 5-10 parts of quicklime, 22-40 parts of fly ash, 0.1-1 part of zinc powder foaming agent, 0.5-2 parts of thickening time control agent, 1-2 parts of aluminum hydroxide, 1-3 parts of dispersing agent and a proper amount of sodium hydroxide. By adding the sodium hydroxide, the pH value of the prepared slurry is 12-13. The material can obviously enhance the compression strength of the filled body, can enhance the critical fracture toughness and stability of the filled body, implements long-distance line delivery, and also implement quick filling and high-efficiency fireproofing and extinguishment.

The invention discloses a current type terahertz pyroelectricity detector reading circuit, and belongs to the field of terahertz detecting and imaging. The reading circuit comprises a current-voltage converter, a 50Hz trap circuit, a first-order lowpass filtering amplifying circuit and an electric potential raising module. Signals output by the terahertz pyroelectricity detector are input into the current-voltage converter so that the current signals can be converted into voltage signals; the signals output by the current-voltage converter are input into the 50Hz trap circuit so that power frequency interference can be eliminated; the signals output by the 50Hz trap circuit are input into the first-order lowpass filtering amplifying circuit so that the signals can be further amplified; the signals output by the first-order lowpass filtering amplifying circuit are input into the electric potential raising module so that a voltage can be raised and the voltage signals output by the circuit can be matched with a voltage required by a rear digital collecting circuit. The voltage signals output by the circuit are pure, and the circuit is suitable for collecting and outputting a weak current of the terahertz pyroelectricity detector.

The present invention relates to a novel spectacles type display which comprises micro-display chips, optical prisms, a display control circuit, etc. Two identical micro-display chips are cooperated with two optical prisms to form a binocular spectacles type display; the micro-display chips and the optical prisms respectively form a left-eye display and a right-eye display; the left-eye display and the right-eye display have symmetrical spatial locations; the distance between centers of the left-eye display and the right-eye display is between 63 mm and 65 mm; the inverted extension lines of normals of image surfaces of two displays intersect in the two-meter-place. The optical prism has three surfaces: a plane, a spherical surface and a free curved surface. Three surfaces of the optical prism of the invention only have a non-standard curved surface in order that the design, adjustment and manufacturing methods are simple and feasible. The invention adopts an AV port and a VGA port compatible with VESA standard and can link to any video equipment with the AV port and the VGA port. The invention also has the function of focusing for myopes to use.

A 8k line scan lens is characterized in that, from an object side to an image side, a first convex-concave lens, a second convex-concave lens, a doublet of a first biconvex lens and a first biconcave lens, an iris, a doublet of a second biconcave lens and a second biconvex lens, a first concave-convex lens and a second concave-convex lens are sequentially fixed in a lens barrel. The invention has the advantages of high accuracy and small aberration, and the image is unlikely to be distorted. The line scan lens with adjustable amplification rate can be applied in automatic optical detection equipment and can be matched with large-size and high-accuracy line array CCD camera.

Disclosed is a portable cutter wear measurement apparatus. The apparatus is characterized by comprising a miniaturized microscope (1), a mobile phone (2) and an elastic mobile phone clamp (3), wherein an ocular lens end of the miniaturized microscope (1) is installed on one clamping jaw (4) of the elastic mobile phone clamp (3) in a rotating mode, the clamping jaw (4) is provided with a through hole, the through hole is opposite to a shooting lens of the mobile phone (2), another clamping jaw (5) of the elastic mobile phone clamp is clamped on the front surface of the mobile phone (2), and the mobile phone (2) processes a shot picture by use of its own image processing software or sends the shot picture through a data line to a computer (8) preinstalled with the image processing software for analysis so as to obtain cutter wear data. The structure is simple, the application is convenient, real-time rapid detection can be performed without removing a cutter from a knife rest, wear conditions can be obtained timely, and a basis can be provided for replacing or reconditioning the cutter.

The invention discloses a three-phase dry type magnetic voltage regulator driver for driving a cathodic power supply for processing niobium-silicon alloy. The driver utilizes a reference control voltage signal module to generate needed standard voltage signals and carries out reversed-phase amplification through a control voltage operational amplifier module. After amplitude is regulated by a control voltage regulation potentiometer, a driving operational amplifier carries out operational processing and power amplification on the regulated voltage signal and a current feedback signal to driveand control a driving power amplifier. By controlling the current magnitude of a voltage regulator coil, the driving power amplifier changes the magnetic flux of a three-phase dry type transformer inorder to regulate the output power of the cathodic power supply. An experiment indicates that the three-phase dry type magnetic voltage regulator driver for driving the cathodic power supply for processing niobium-silicon alloy can ensure the output of the cathodic power supply to have a smooth controllable on-load stepless voltage regulation characteristic; and has the advantages of reliable operation and low high-frequency noise.

The invention discloses an integrated weak electric signal filtering and amplifying circuit, which comprises a coupling capacitance circuit, a first chopping change-over switch circuit, an operationalamplifier circuit, a second chopping change-over switch circuit, a filtering circuit, a first direct current feedback circuit, a second direct current feedback circuit, a first feedback capacitor array circuit and a second feedback capacitor array circuit. The integrated weak electric signal filtering and amplifying circuit provided by the invention can effectively eliminate DC offset of electrodes without causing distortion of a target signal, can suppress motion artifacts to a certain extent, and has configurable high-pass cut-off frequency, adjustable magnification times and low circuit noise at the same time, thereby improving the integration level and precision of the whole signal acquisition system.

The invention provides a lens and a manufacturing method there as well as a pair of glasses and an optical system. The lens comprises a fresnel liquid crystal lens and a geometric lens. According to the lens provided by the invention, the fresnel liquid crystal lens can electrically control and adjust the focal length of the lens; furthermore, the fresnel liquid crystal lens is also combined withthe geometric lens for use, the focal length and wavelength of the fresnel liquid crystal lens are inversely proportional, and the focal length of the geometric lens is proportional to the wavelengththe geometric lens, so that the problem of chromatic aberration of the common optical component can be effectively reduced by the combination of the fresnel liquid crystal lens and the geometric lens.

The invention discloses a piezoresistive force sensor signal amplification module, which comprises a power interface, a power conversion circuit, an input interface, a primary amplification circuit, aprimary amplification output bias circuit, a secondary amplification circuit and an output interface, an external power supply is introduced from the power supply interface, and multiple paths of power supplies are output through voltage reduction of the power supply conversion circuit to supply power to circuits and force sensors; the input interface accesses a pair of differential signals output by the force sensor and supplies power to the force sensor; the first-stage amplification circuit amplifies a pair of differential signals accessed to the input interface, the output voltage is increased or decreased through the first-stage amplification output bias circuit, and the differential signals are amplified through the second-stage amplification circuit and then output through the output interface. The module is simple, easy to use, high in universality, high in reliability and capable of supplying power to the force sensor and amplifying signals, the amplification factor and biasvoltage of the module can be adjusted, the force measurement precision is effectively improved through proper adjustment, the module can be directly applied to various devices, and the device development and production cost is greatly saved.

The invention provides a liquid lens and a using method thereof and an optical system. The liquid lens comprises an annular first electrode, a second electrode, a first cover plate, a liquid storage cavity at least formed by a first electrode, a second electrode and the first cover plate, an optical liquid stored in the liquid storage cavity, and a flow control device arranged on the side wall of the liquid storage cavity and communicated with the liquid storage cavity to control the proportion of a conductive liquid to a non-conductive liquid. According to the liquid lens and the using method thereof and the optical system, the liquid storage cavity is formed on the basis of the containing area defined by the annular first electrode, the flow control device is designed on the side portion of the liquid storage cavity, and the proportion of the conductive liquid to the non-conductive liquid in the liquid storage cavity can be changed through the flow control device; and the liquid lens is simple in structure, high in imaging quality, adjustable in magnification and convenient to integrate, and can be widely applied to optical focusing and zooming systems.

The invention belongs to the technical field of busbar monitoring, in particular to a busbar current leakage detection apparatus with input protection. The technical problem to be solved by the invention is to provide a busbar current leakage detection apparatus which has small-sized circuits, can be manufactured at a low cost and provides highly stable performances. The apparatus comprises a photoelectric isolation circuit, an amplifying circuit, a wireless transmitter and a controller wherein the photoelectric isolation circuit includes an optical-coupler (A1), a resistor (R1), a resistor (R2) and a diode (D1). The amplifying circuit comprises an instrument amplifier (B1), a resistor (R3), a resistor (R4) and a resistor (R5). The invention can find applications in an electric power department.

The invention discloses a VR video slow live broadcast interaction method and system. The VR video slow live broadcast interaction method comprises the steps of: acquiring a VR video slow live broadcast stream, and carrying out the video live broadcast after preprocessing; receiving an interaction request sent by a user through using VR interaction equipment in the live video broadcasting processand responding to the interaction request, wherein the step is specifically implemented by sending a request for amplifying a specific region through VR interaction equipment in a live video broadcasting process by a user; and acquiring information of the specific area, performing fusion decoding, and performing amplified rendering display based on the view angle center of the specific area. Aiming at a new live broadcast form of slow live broadcast, audiences can feel a 360-degree all-around service scene in a VR video mode, an interaction means is introduced for weakening the interest of long-time watching, the audiences can select interested view angle areas to amplify and watch ultra-high-definition picture details, the amplification factor is adjustable, the information amount is large, the interaction feeling is strong, the display effect is excellent, the user experience is remarkably improved, and the watching loyalty of the user is improved.

The invention provides a liquid nitrogen frozen rock microstructure in-situ observation method. The method comprises steps of (1) heating a polished rock sample so that the rock sample is uniformly heated; (2) fixing the uniformly heated rock sample on a sample holder; (3) soaking the rock sample in liquid nitrogen till an internal temperature field of the rock is stable; (4) sequentially carryingout vacuumizing treatment, sublimation treatment and coating treatment of the rock sample; and (5) observing the rock sample subjected to film coating treatment by using a freezing electron microscope. The method is advantaged in that the microstructure of the liquid nitrogen frozen rock can be observed in situ in an ultralow temperature environment (-185 DEG C), the temperature of the rock sample in the observation process is consistent with the actual situation of a liquid nitrogen fracturing site, and the observed thermal stress micro-crack size and other microstructures better conform tothe actual situation of the liquid nitrogen fracturing site.

The invention discloses a spray head lifting and positioning mechanism and a printing device. The spray head lifting and positioning mechanism comprises lifting guide frames (1), ball screws (2) and aservo motor (6); a spray head is mounted on a mounting frame; the lifting guide frame and the ball screw are both two, and the two ball screw rods are arranged on the two lifting guide frames respectively; the two ends of the mounting frame with the spray head are sleeved with the two ball screw rods; each ball screw is driven by the servo motor (6); when the servo motor rotates, the mounting frame and the spray head can be driven to ascend and descend through the transmission of the ball screw; the mounting frame is provided with an inclination angle sensor used for detecting the inclinationangle of the mounting frames; the two ball screws are driven by two independent servo motors respectively; a tilt angle sensor is connected with a MCU; and the servo motor is controlled by the MCU. The spray head lifting and positioning mechanism and the printing device are compact in structure, high in positioning precision and easy to implement.