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

The invention relates to an optoelectronic distance measuring device having a transmitting unit having a driver stage for a light source for emitting optical pulses as pulsed-mode-intensity-modulated optical radiation, having a receiving unit for receiving a portion of the optical radiation, said portion being reflected from a target object, and converting it into an electrical reception signal, by means of a photosensitive electrical component. It also has an analogue-digital converter for digitizing the reception signal, and an electronic evaluation unit which is designed in such a way that a distance from the target object can be ascertained on the basis of a signal propagation time using the digitized reception signal.

The invention relates to a method and a device for assisting the parking of a motor vehicle (1) in a parking space. Said method comprises the following steps: the vehicle is driven up to the parking space; the parking space is measured by means of sensors arranged on the motor vehicle (1); a nominal parking path is calculated and displayed on a display (15); and the actual parking path (22) is displayed on the display (15) in such a way that the actual parking path (22) can be adapted to the nominal parking path (21).

The invention provides an automobile generator rotor inspection mechanism, which belongs to the technical field of machinery. According to the invention, a rotor comprises claw poles and a shaft body;an inspection mechanism comprises a base, a sliding seat arranged on the base in a sliding manner, and a second driving piece for driving the sliding seat to slide back and forth in the horizontal direction; three guide rods are arranged in the sliding direction of the sliding seat, one guide rod is provided with a first spring and two first base blocks which are symmetrically arranged, the firstbase blocks are arranged on the guide rods in a sliding mode, and the first spring enables the two first base blocks to move back to back; the other two guide rods are each provided with a spring unit and a pair of second base blocks which are symmetrically arranged, the second base blocks are arranged on the guide rods in a sliding mode, and the spring units enable the second base blocks to moveoppositely; the first base blocks are provided with first protruding heads abutting against the inner walls of the claw poles, the second base blocks are provided with second protruding heads, one pair of second protruding heads abut against the outer walls of the claw poles, and the other pair of second protruding heads abut against the outer side wall of the shaft body. A first displacement sensor is fixed on one first base block, and second displacement sensors are arranged on the two second base blocks. The mechanism is high in efficiency.

The invention discloses a method for detecting the insertion depth of a connecting reinforcement in a full grouting sleeve reinforcement joint. The method is characterized in that a three-dimensionalstereoscopic measuring endoscope is used for detecting the insertion depth of the connecting reinforcement joint in the full grouting sleeve, involving the reinforcement at a grouting inlet end and ata grouting outlet end, and the detecting time is after the on-site splicing of a prefabricated member and before the construction of the sleeve grouting; an endoscope probe provided with a forward-looking three-dimensional measuring lens is protruded from a grouting opening and a grouting outlet in the surface of the prefabricated member, and the guiding bending function of the endoscope probe and a gap between the connecting reinforcement and the inner wall of the sleeve are utilized to protrude the endoscope probe into the sleeve to shoot a 3D image of the middle part of an inner cavity ofthe sleeve. By measuring the relative distance between the tail end of an insertion section of the connecting reinforcement in the 3D image and a limiting stopper in the middle of the sleeve, the characteristic of high precision of sleeve production and manufacturing is used to calculate the insertion depth of the connecting reinforcement. The method can be used for visually, clearly and quantitatively obtaining the insertion depth of the reinforcement and improving the detection efficiency.

The invention discloses a method for detecting the insertion depth of a connecting steel bar in a semi-grouting sleeve steel bar joint. A three-dimensional measurement endoscope, a rigid sleeve pipe and a rubber plug. The three-dimensional measurement endoscope comprises an endoscope host, a connection hose, a probe and lenses connected in sequence, and the lenses comprise a front-view three-dimensional measuring lens and a side-view three-dimensional measuring lens. A central hole is arranged in the middle of the rubber plug, and the rigid sleeve can be inserted into the rubber plug through the central hole. The relative position of an end of an inserted section of the connecting steel bar and the bottom of a sleeve grout discharging port is judged by using an auxiliary tool. When a judgment result is that the end of the inserted section of the connecting steel bar is above the bottom of the sleeve grout discharging port, the front-view three-dimensional measuring lens is used to measure and calculate to obtain a result, and when the judgment result is that the end of the inserted section of the connecting steel bar is under the bottom of the sleeve grout discharging port, the side-view three-dimensional measuring lens is used to measure and calculate to obtain a result. According to the method, the insertion depth of the steel bar can be intuitively, clearly and quantitatively obtained, and the detection efficiency is improved.

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 provides an automobile generator rotor inspection mechanism, which belongs to the technical field of machinery. In the present invention, the rotor includes claw poles and a shaft, and the inspection mechanism includes a base, a sliding seat slidably arranged on the base, and a driving member 2 for driving the sliding seat to reciprocate in the horizontal direction. Three guide rods are arranged, one of which is provided with a spring one and two symmetrically arranged base blocks one, the base block one slides on the guide rod, and the spring one moves the two base blocks one against each other; A spring unit and a pair of base blocks 2 are arranged symmetrically. The base block 2 slides on the guide rod, and the spring unit moves the pair of base blocks 2 towards each other; , the base block 2 has protruding heads 2, wherein a pair of protruding heads 2 abut against the outer wall of the claw pole, and the other pair of protruding heads 2 abuts against the outer wall of the shaft body; one of the base block 1 is fixed with a displacement sensor 1, wherein Displacement sensor 2 on two base blocks 2. The invention has high efficiency.

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.

The invention discloses a rock-soil seepage monitoring sensor and a preparation method thereof. The sensor preparation method comprises the following steps: (1) calculating and determining the distance between an electrolysis electrode and a conductance electrode; (2) determining the material, shape and size of a substrate; (3) Determine the material, shape and size of the electrolysis electrodes; (4) Determine the material, shape, size and number of the conductivity electrodes; (5) Make and fix the electrodes. The sensor manufactured by the invention has the advantages of simple structure, small volume, low cost, no new substances are introduced in the tracing process, no environmental pollution, the required measuring distance of the method is small, and flow velocity components in multiple directions can be simultaneously measured.

The invention discloses a tree three-dimensional green biomass measurement method which comprises the following steps of: acquiring sampling point information collected by a prism-free full-station instrument in real time by a green biomass calculator; extracting sampling point combination diaphragm layers with same layers, and generating an arc section polygon according to the coordinates of the sampling points in the diaphragm layers; calculating the volume of a tree crown formed by the projection of an arc section polygon of an upper diaphragm layer and an overlapped region of the arc section polygon of a lower diaphragm layer in adjacent diaphragm layers; calculating the volume of a tree crown formed by the projection of an arc section polygon of an upper diaphragm layer and a non-overlapped region of the arc section polygon of a lower diaphragm layer in adjacent diaphragm layers; calculating the total volume of the tree crown, wherein the total volume of the tree crown is the sum of the volume of the tree crown formed by the overlapped region and the volume of the crown formed by the non-overlapped region. The invention also discloses a tree three-dimensional green biomass measuring system. According to the invention, the sampling points collected by the prism-free full-station instrument can be processed in layers; and combined with the arc section polygon, the volume of the tree crown formed by the overlapped region and the volume of the tree crown formed by the non-overlapped region are calculated respectively, and the accuracy is high.

The invention discloses a method of measuring a seepage flow velocity by electrolytic polarization. The method comprises the following steps of arranging an electrolysis electrode used for generating the electrolytic polarization to form ionic pulses; arranging a conductivity electrode used for measuring system conductivity to sense the change of ionic concentration; applying a direct voltage to the electrolysis electrode for a certain time, and at the same time drawing a conductivity change curve through conductivity change measured by the conductivity electrode; on the conductivity change curve subjected to smoothing, taking the time that the electrolysis electrode starts to apply the direct voltage as a zero point to solve the time that a conductivity maximum value or a conductivity minimal value occurs; measuring a flow velocity according to the time the conductivity extreme values occur and calculation of electrode spacing of the two electrodes; calculating an actual flow velocity according to a correction coefficient a and a compensating factor b which are measured by calibration. The method provided by the invention is simple and convenient to operate; no new objects are introduced in a tracer process; no environment pollution exists; the measuring distance required by the method is short; velocity components in multiple directions can be measured at the same time, and a continuous measurement method is provided for seepage monitoring.