36 results about "Linearity testing" patented technology

A license plate localization method and system based on a combination of a top-down texture analysis and a bottom-up connected component. An image with respect to a vehicle captured by an image capturing unit can be processed in order to locate and binarize a busy area. A black run with respect to the binarized image can be analyzed and classified and one or more objects (connected components) can be generated based on the black run classification. The objects can be further classified in accordance with their size utilizing a run-length based filter to filter out a non-text object. The leftover objects can then be spatially clustered and the uniformity and linearity of the clustered objects can be examined based on a linearity test. The clustered objects can be rejected if they fail the linearity test and the detected objects can further be matched with a plate edge characteristic in order to locate a license plate.

The invention disclose a straightness detecting device for a lead rail, which includes a working platform; the surface of the working platform is provided with at least two bottom locating pieces and at least two side locating pieces which are respectively arranged along the length direction of the working platform as well as a lifting movable roof; one side of the surface of the working platform is provided with a linear track along the length direction of the working platform; a movable meter holder is arranged on the linear track in a sliding way; a measuring device is arranged on the movable meter holder. The working platform of the invention is provided with a linear rail track which is parallel with the working surface of a lead rail to be detected; the movable measuring device sliding along the linear track walks on the surface of the working surface of the lead rail for detecting the straightness of the working surface of the lead rail; the straightness detecting device for the lead rail has high detecting precision and is conveniently operated.

A high-linearity testing stimulus signal generator comprises a signal collection unit receiving an input current signal, a waveform conversion unit connecting with the signal collection unit, a first voltage-to-current conversion unit connecting with the waveform conversion unit, a delay unit connecting with the waveform conversion unit, a second voltage-to-current conversion unit connecting with the delay unit, a current comparison unit connecting respectively with the first voltage-to-current conversion unit and the second voltage-to-current conversion unit, an error calculation unit connecting with the current comparison unit, and a compensation unit connecting with the error calculation unit. The above-mentioned structure forms a feedback mechanism to perform compensation adjustment to promote the linearity of the output signals. Thus, the present invention can generate high-accuracy testing stimulus signals.

The invention discloses a testing device for linearity of an electro-optical modulator. If the electro-optical modulator to be tested is an intensity modulator, an optical wave from an optical sourceis sent to the electro-optical modulator to be tested, a modulation signal generator generates a modulation signal and sends the modulation signal to the electro-optical modulator to be tested, a first demodulator circuit and a second demodulator circuit; a test signal generator generates a test signal and sends the test signal to the electro-optical modulator to be tested and the first demodulator circuit. In the electro-optical modulator to be tested, the modulation signal causes the two optical waves to generate modulation phase difference, the test signal causes the two optical waves to generate test phase difference, the two optical waves are interfered and sent to a detector, and sent to the second demodulation circuit after photoelectric conversion, the first demodulation circuit obtains the size of the test signal, and the second demodulation circuit obtains the test phase difference; if the electro-optical modulator to be tested is a Y-waveguide integrated optical device, theoptical wave of the optical source is sent to the electro-optical modulator to be tested by an electro-optical modulator for modulation, the modulation signal from the modulation signal generator is sent to the electro-optical modulator for modulation, the test signal from the test signal generator is sent to the tested electro-optical modulator, and the other structures are not changed.

The invention relates to a recording power compensating system and a recording power compensating method. A best power test is controlled by a control unit; a calculating unit is used for approximating test power and a corresponding asymmetry parameter into a linear test power function and calculating a difference value of the asymmetry parameter tested by a test unit and corresponding power compensation amount; and a power compensating unit makes use of the power compensation amount to adjust laser beam power so as to improve the recording quality.

The invention discloses a device and method for detecting and determining the straightness of the width of a square guide rail, including a workbench, a controller, a double linear guide rail and a transmission motor. Connected by a ball screw, a measuring device is installed on the workbench at the front and rear sides of the detection platform, the measuring device and the transmission motor are connected with the controller, the controller is connected with a data processor, each measuring device is connected with the data processing connected to the device. The beneficial effects of the present invention are: by using two measuring devices to detect the two surfaces of the square guide rail at the same time, the flatness of the two surfaces of the square guide rail can be quickly judged, and the width of the square guide rail can also be detected at the same time, which is convenient for judgment Regarding the straightness or curvature of the square guide rail, the present invention also has the advantages of wide application range, easy operation, high detection accuracy and high efficiency.

The invention discloses a waterlog comprehensive testing system and a waterlog comprehensive testing platform thereof. The waterlog comprehensive testing system consists of a sensor property testing unit, a circuit board voltage and linearity testing unit, a circuit board static pressurization testing unit, a waterlog communication signal testing unit, a waterlog power supply adaptability testingunit, a microprocessor and a computer. The upper case body of the waterlog comprehensive testing platform is provided with a gas valve switch, a waterlog testing passage, a waveband switch, a toggle switch, a voltage indicating lamp and an interface connector from left to right in sequence; and the top panel of a middle case body is provided with a motion axis tool, a sensor testing tool and a waterlog circuit board tool. The system is a set of testing equipment for detecting the performance state and the delivery inspection in a waterlog production process, and has the advantages of ensuringproduct quality and high automation degree, improving the efficiency of product inspection, possibly reducing human operation and detection errors, and effectively avoiding inspection errors caused by objective factors of humans.

The invention provides a detector dynamic performance integrated testing and evaluating method. The detector dynamic performance integrated testing and evaluating method comprises steps of 1, performing the reception linear test and the ground noise test; 2, performing the pulse signal test and the weak signal reception ability test; 3, performing the anti-interference capability test and the actual seismic signal reception capability test; 4, performing the field test to verify the reception performance of the detector by comparing actual seismic tests; and 5, performing the integrated performance evaluation of the detector. The detector dynamic performance integrated testing and evaluating method is closely integrated with the actual data, and the effect is more obvious. It is an effective method to preferably select the detector according to the seismic exploration demand.

The invention discloses a static stiffness testing device for the joint part of a rolling linear guide rail. Three positioning holes A, B and C are arranged on the bridge type box body; Stiffness test loading; fix the tensile load loading mechanism in the positioning hole A, and perform normal tensile stiffness test loading; fix the pressure load loading mechanism in the positioning hole B, and perform lateral stiffness test loading; fix the torque loading mechanism in the positioning In hole A, carry out angular stiffness test loading around the Z axis; fix the torque loading mechanism in positioning hole B, and carry out angular stiffness test loading around the Y axis; fix the torque loading mechanism in positioning hole D on the front panel of the bridge box , to carry out angular stiffness test loading around the X axis. The invention also discloses a method for testing the static stiffness of the joint part of the rolling linear guide rail pair. The device and method of the present invention adopt a modular structure design, which can meet the requirements of stiffness testing of guide rails of different specifications.

The embodiment of the invention discloses a determination method and apparatus of offset parameters of an active device, a storage medium and electronic equipment. The determination method of offset parameters of an active device includes the steps: obtaining an offset parameter range of the active device in the equipment to be tested at the current frequency range or frequency point, and determining at least two test offset parameters in the offset parameter range; according to the at least two test offset parameters, setting the active device in the equipment to be tested, and determining acorresponding linearity test value; and according to the linearity test value and the preset linearity threshold, determining a target offset parameter of the current frequency range or frequency point. Through the above technical scheme, the determination method of offset parameters of an active device performs a linearity test on each equipment to be tested under a plurality of test offset parameters, according to the linearity test value fed back from the linearity test, determines the target offset parameter of the active device of each equipment to be tested, thus guaranteeing excellent performance of each equipment to be tested, and solves the performance difference problem caused by applying the same group of offset parameters to the active devices of the same type of equipment, thus improving consistence of performance of the equipment.

The invention discloses a gamma waveguide phase modulation linearity testing method used for optical fiber gyro, which comprises: composing a testing system by a light source, a optical fiber coupler, a tested gamma waveguide, a optical fiber ring, a photo detector, an A / D converter, an D / A converter and a digital logic processing unit; the digital logic processing unit sending out line form changeable digital square wave with duty ratio of 1:1 to modulate the tested gamma waveguide; and fitting the phase difference of the tested gamma waveguide by least squares method to achieve the modulated linearity. By adopting the square wave with duty ratio of 1:1 with half of the optical fiber ring eigenfrequency to modulate the tested gamma waveguide, increasing the amplitude linearity, and fitting the tested gamma waveguide by least squares method, the invention increases the precision of optical fiber gyro scale factor; meanwhile, by adopting the high accurate D / A converter and A / D converter to modulate and demodulate, the invention increases the testing precision while the phase difference of the tested gamma waveguide is at pi or 2pi.