32results about How to "Comparable accuracy" patented technology

The invention pertains to a measurement system for measuring displacement of a moveable object relative to a base in at least a first direction of measurement, the moveable object having at least one reference part that is moveable in a plane of movement relative to the base, the actual movements of the reference part being within an area of said plane of movement that is bounded by a closed contour having a shape. The measurement system comprises a sensor head that operatively communicates with a planar element. The sensor head is mounted onto the base and the planar element being mounted onto the reference part of the moveable object or the other way around, wherein the planar element has a shape that is essentially identical to the shape of the closed contour.

A fiber grating device of low cost and arbitrary length is formed on a portion of a portion or the entirety of a highly elastic fiber optic core having a low Young's modulus of elasticity by causing elongation of the fiber optic core and forming or depositing a hard skin or cladding on the elongated fiber optic core. When the stress is then released, the hard skin or cladding buckles (including elastic or plastic deformation or both) to form wrinkles at the interface of the fiber optic core and the hard skin or cladding which are oriented circumferentially and highly uniform in height and spacing which can be varied at will by choice of materials, stretching, and thickness and composition of the cladding. Since the elastic elongation of the fiber optic core portion may be 200% or greater, an unprecedented measurement range is provided.

The invention relates to a method for acquiring the amplitude of a single-frequency signal, comprising the steps as follows: acquiring a sum sequence y(n) of a single-frequency signal x(n), wherein the sum sequence y(n) is obtained by continuously and sequentially calculating the sum of every M sample points of the single-frequency signal x(n), M=|p_max-p_min|, p_max is the position of the maximum value of the single-frequency signal x(n), and p_min is the position of the minimum value of the single-frequency signal x(n); calculating the peak value PK(y) of the sum sequence y(n) by using the maximum value max(y) and the minimum value min(y) of the sum sequence y(n), wherein PK(y)=[max(y)-min(y)] / 2; and calculating PK(y) / M, and adjusting the gain of PK(y) / M to obtain the amplitude of the single-frequency signal x(n). According to the invention, the amplitude of the single-frequency signal is obtained quickly by working out the difference between the maximum value and the minimum value after mean filtering. The method is simple and feasible, has low requirement on computation, is suitable for an occasion in which there is a need to obtain the amplitude of a single-frequency signal quickly, and is particularly suitable for an occasion in which all voltage are lost when the power grid suffers from power theft and the power metering unit is powered by a battery.

The invention provides a high-precision clock chip compensation production system and method. The system includes a PC and a main control software module, a first-level main control unit, a second-level main control unit, a third-level main control unit assembly module, and a frequency measurement unit. Collection module, reference clock source module, chip DUT backplane module, thermostat module; three-level main control unit collection module contains several three-level main control units; frequency measurement unit collection module contains several frequency measurement units; chip DUT bottom board module Several chip DUT devices are arranged; the chip DUT bottom plate module is arranged in the temperature box. The production system of this scheme has low cost, high precision, good scalability, and significantly improved production efficiency.

The invention discloses a character recognition method based on a tesseract engine and a corresponding device thereof. A cloud server is used to upgrade a local character library to correct the recognition result of the tesseract engine, thereby improving the accuracy of the tesseract engine in recognizing characters in an image. The character recognition device of the present invention includes a server, a tesseract engine module, a cloud server and a local character library. When upgrading the local text library, the server uses the text recognized by the cloud server to correct the recognition result of the tesseract engine module, and supplements the text that the tesseract engine module cannot correctly recognize into the local text library. In this way, when performing character recognition, the recognition accuracy can be improved by querying the local character library. The present invention uses the upgraded local character library to correct the recognition result of the tesseract engine module, which can achieve the same accuracy as directly using the cloud server for character recognition, and can also shorten the time for character recognition calculations, and is suitable for daily learning and image recognition at work. into words.

The invention discloses a positioning system for a take-off deviation of an airplane, which comprises a signal generator, a signal acquisition device and a deviation positioning unit, wherein the signal generator consists of power-on solenoids vertical to each other, is arranged on an airstrip and is used for transmitting a signal; the signal acquisition device is arranged on a nose of the airplane and is used for receiving the signal transmitted by the signal generator; and the deviation positioning unit is connected with the signal acquisition device and is used for carrying out real-time resolving on the acquired signal to determine a distance that the nose of the airplane deviates the center line of the airstrip. The invention also provides a positioning method for the take-off deviation of the airplane. The positioning system of the invention has low cost. The precision of the positioning system is higher than that of the common GPS system and is equivalent to that of a GBAS system. The positioning system has simple structure, is easy to arrange, can be applied to the field opportunity airfield and is unlike the GBAS system which needs to arrange an expensive ground base station. The positioning system is self-provided with a signal source, is independent from the commonly used global positioning system and can be applied to the runways in large-scale shelters and the areas with bad satellite signals.

The invention discloses a determination method for cadmium amount in copper slag. The determination method disclosed by the invention adopts an oscillographic polarography which comprises the following steps: taking hydrochloric acid-ammonium acetate as a base solution, pouring a prepared sample solution into an electrolysis cup for oscillographic polarograph photoplotting, and anodizing dipolar derivative waves, starting scanning when an origin potential is -224 mV, and measuring an output peak value; transferring and taking a pure cadmium standard solution along with a sample to obtain the output peak value of the pure cadmium standard solution; calculating the cadmium content in the copper slag sample by using a standard contrast method according to the concentration and the output peak value of the standard solution. Compared with a classic hydrochloric acid base solution method and an ammoniacal base solution method, the analysis method for determining the cadmium amount in copper slag by using the oscillographic polarography disclosed by the invention is stable in waveform and quite high in accuracy; the method is easy and fast, and also eliminates the influence of ammonia gas on a human body; moreover, the determination method is good in precision and high in analysis speed, can meet the requirement for rapid analysis in production, meanwhile provides accurate and reliable data, so as to play a good role in guiding production.