39results about How to "Shorten the measuring distance" patented technology

An optoelectronic distance measuring device is disclosed. The device has a transmitting unit with a driver stage for emitting optical pulses, a receiving unit for receiving a portion of the optical pulses, said portion being reflected from a target object, and converting it into an electrical reception signal, via a photosensitive electrical component. It also has an analog-digital converter for digitizing the reception signal, and an electronic evaluation unit to ascertain a distance from the target object on the basis of a signal propagation time using the digitized reception signal. The driver stage can be designed so that at least two pulse durations of different length for the optical pulses can be set.

A range finder includes a package, a semiconductor chip, an optical casing, a lens holder, a first lens, and a second lens. The first and second lenses are attached to the lens holder. The lens holder is formed of a material having a thermal expansion coefficient equal or close to that of the semiconductor chip. The range finder is constructed such that a distance between the two lenses and a distance between two light detecting sections on the semiconductor chip do not change significantly relative to each other due to the thermal expansion or contraction.

A system for measuring object points on a three-dimensional object using a planar array of a multi-camera group, and a measuring method, are provided. The system is useful in the field of optical measuring technologies. The method includes establishing a measuring system of at least one four-camera group wherein digital cameras form a 2×2 array; matching an image object point acquired by the camera group; upon matched object point image coordinates, calculating coordinates of spatial locations of respective object points; upon coordinates of the spatial locations, calculating other three-dimensional dimensions of the measured object to be specially measured to form three-dimensional point clouds and establish a three-dimensional point clouds graph for performing three-dimensional stereoscopic reproduction. Here, full matching is performed for all measured points of the measured object by directly translating, superimposing, and comparing, point-by-point, the pixel points of measured images in X and Y-axes directions. In this way a three-dimensional object may be reproduced.

The invention discloses a TOF based ranging system and its correction method. A main transmitting tube and a transmitting focusing lens group are arranged inside a transmitting lens barrel. A receiving lens barrel is in parallel arrangement with the transmitting lens barrel; the receiving lens barrel comprises an anti-stray light structure and a receiving focusing lens group. The anti-stray light structure is of a conical structure; the big end part of the conical structure's opening is connected with the receiving focusing lens group while the small end part of the opening is provided with an optical filter. A photosensitive receiving tube and an auxiliary transmitting tube are arranged under the optical filter and both are welded on a circuit board. During the rapid correction of the system, the main transmitting tube does not work, and the auxiliary transmitting tube transmits a beam of modulated infrared light, which is received by the photosensitive receiving tube and is converted into an electric signal. The internal circuit of the circuit board records the phase different between the modulated signal and the photosensitive receiving tube received signal at the time, calculates the ranging distance error at the time, and stores the distance error in a storage device. In this manner, the correction process is completed and compensation can be made to each measurement result.

The invention relates to a laser positioning distance measuring tool. The laser positioning distance measuring tool comprises a precise sliding guide rail, a left sliding seat and a right sliding seatwhich are transversely arranged, wherein the left sliding seat and the right sliding seat are respectively in sliding connection with left and right ends of the precise sliding guide rail, a right end of a top surface of the left sliding seat is provided with a laser distance measuring instrument, one side of the left sliding seat is provided with a vertical left laser lamp, a left end of the topsurface of the left sliding seat is provided with a left power supply module, the left laser lamp is connected with the left power supply module, a left end of a top surface of the right sliding seatis provided with a right power supply module, one side surface of the right power supply module opposite to the laser distance measuring instrument is provided with a laser reflection board, one sideof the right sliding seat is provided with a vertical right laser lamp, the right laser lamp is connected with the right power supply module, laser emission ends of the left laser lamp and the rightlaser lamp are arranged in the same direction, and an interval between the left laser lamp and the right laser lamp is equal to an interval between the laser distance measuring instrument and the laser reflection board. The laser positioning distance measuring tool has advantages of simple structure, convenient operation, low production cost and high measurement precision.

The invention discloses a ship draught detection system and a working method thereof. The system comprises a single-beam ultrasonic sensor array, a detection door, a water reference surface measurement device, a temperature measurement device, a sound velocity calibration device and a draught detection and process unit. The sound velocity calibration device comprises a long-distance shield ultrasonic wave device and a short-distance shield ultrasonic wave device which are arranged on the two sides of the detection door respectively, and the long-distance shield ultrasonic wave device and the short-distance shield ultrasonic wave device are used for reflecting ultrasonic wave which is transmitted from one or more single-beam ultrasonic sensors on the two sides of the detection door. The measurement of the mounting depth of the underwater detection door is changed into the measurement of the water distance, simultaneously the measurement distance is shortened, the precision is greatly increased, and the error is reduced. The temperature of the ultrasonic sensor array is measured by the temperature measurement device, and the used average sound velocity value is corrected. The accuracy of the sound velocity value in site is increased.

The invention discloses a rock soil seepage monitoring sensor and a manufacturing method. The sensor manufacturing method comprises the following steps: (1) the distance between an electrolysis electrode and a conductance electrode is calculated and determined; (2) the material, the shape and the size of a substrate are determined; (3) the material, the shape and the size of the electrolysis electrode are determined; (4) the material, the shape, the size and the number of the conductance electrode are determined; and (5) manufacturing and fixing of the electrodes are carried out. The sensor manufactured by the invention has a simple structure, small size and low cost, no new materials are introduced during a tracing process, no environmental pollution exists, the measurement distance needed by the method is small, and flow velocity components in multiple directions can be determined simultaneously.

The invention discloses a tree measuring method including that sampling point information collected by a non-prism total station in real time is acquired by a processor, the sampling point information includes a highest altitude Ht, a lowest altitude Hb and sampling point coordinates; a tree height H is calculated by the processor according to the highest altitude Ht and the lowest altitude Hb, the tree height H=Ht-Hb; tree crown projected area is calculated by the processor according to the sampling point coordinates. The invention further discloses a tree measuring system. By the aid of the tree measuring system and method, the sampling point information of object trees is accurately and efficiently collected by the non-prism total station in complex terrain situation; and the tree height and the tree crown projected area are calculated by the processor. And meanwhile, when the tree crown projected area is calculated, non-linear tree crown projection is linearized by combining a concave-convex polygon according to tree crown total grow state; the tree crown projection is transformed into an arc polygon with concave arcs and convex arcs to be calculated; and the accuracy is high.

A piston-cylinder assembly, in particular for pneumatic, hydraulic or mechatronic systems, includes a cylinder housing and a piston. The piston is coupled to a piston rod and disposed in the cylinder housing such that it can move along a longitudinal axis. A measuring device for detecting piston or piston rod position is provided inside the cylinder housing.

An apparatus for determining properties of a dust mixture flowing through a cross-sectional area of a coal dust line is provided. It has at least one sensor, which has at least one transmitting device for coupling electromagnetic and/or acoustic radiation into the dust mixture and at least one receiving device for generating a measuring signal on the basis of radiation reflected in the dust mixture or radiation transmitted by the dust mixture. Also provided is an evaluation device, which determines the property of the dust mixture on the basis of the measuring signal. The at least one transmitting device and the at least one receiving device or a measuring head are rotatably arranged at least approximately in the middle of the cross-sectional area.

The movable stages carry chucks 10a and 10b and move towards secondary stage bases 11a and 11b and a primary stage base 11, thereby positioning the substrate 1 on the primary stage base 11. Each first laser length-measuring system includes laser sources 31a and 31b, bar mirrors 34a and 34b mounted below X stages 14 of the movable stages, and laser interferometers 32a and 32b disposed at positions deviated from X guide rails 13 on the primary stage base 11, so as to detect positions of the movable stages in X direction. The laser interferometers 32a and 32b will not be influenced by the vibration of the secondary stage bases 11a and 11b. Meanwhile, the measuring distance from the laser interferometers 32a and 32b to the movable stages on the primary stage base 11 is reduced.

The invention discloses a preparation method of an in-situ polymerization low-resistance stable-conduction hydrophobic fabric. The preparation method comprises the following steps: pretreating the fabric by adopting a physical treatment method or a chemical treatment method, and precisely controlling the concentration of an aniline or pyrrole polymer solution, the concentration of ferric trichloride or ammonium persulfate and the temperature and time of low-temperature polymerization reaction; and performing cleaning with deionized water for multiple times of to remove residual reagents, and controlling the temperature and time of vacuum drying to prepare the in-situ polymerization low-resistance stable conduction hydrophobic fabric. The in-situ polymerization low-resistance stable-conduction hydrophobic fabric has micron-scale fiber diameter and pore diameter, controllable fiber form surface morphology, low resistance and good elastic elongation and conductivity, the conductive effecthas lasting stability, heat conduction and distribution on the surface and inside of the fabric are uniform, and a certain hydrophobic effect is achieved. The fabric prepared by the method has potential application value and prospect in the flexible wearable field and the nerve and myocardial repair tissue engineering field.

The invention discloses an auxiliary positioning device. The device is used for positioning foundation bolts on a reinforced concrete foundation platform. The device comprises a vertical supporting rod, a first axis positioning rod arranged on the vertical supporting rod and a first radius positioning rod; the axis which is emergent from the radial direction of the center point of the ring defined by the foundation bolts can be crossed with the first axis positioning rod arranged in the tangent direction of the ring; the first radius positioning rod is arranged on the supporting rod or the first axis positioning rod and is arranged in the radial direction of the ring, the track of the ring can be crossed with the first radius positioning rod. When the foundation bolts are positioned through the auxiliary positioning device, the axis point and the radius point can be precisely positioned on the bolts, through the axis point and the radius point, the reference point is positioned, positioning of the mounting position of the foundation bolts can be achieved, in the process, due to the fact that the measuring distance between the axis point and the radius point and the reference point is obviously reduced, the measuring error is greatly reduced, positioning precision of the foundation bolts can be obviously improved, and the construction quality is ensured.