43results about How to "Calibration results are accurate and reliable" patented technology

The invention discloses a calibration method for breath alcohol testers. The method comprises the following steps that 1, a testing environment is controlled; 2, a reference solution is prepared; 3, grinding jars are put into a thermostatic water bath case; 4, the standard ethanol concentration of the reference solution is obtained; 5, the breath alcohol testers are calibrated uniformly; 6, the test instruments are tidied. According to the calibration method for the breath alcohol testers, the horizontal positions and the longitudinal positions of the grinding jars in the thermostatic water bath case are changed, the obtained average value serves as the standard ethanol concentration of the reference solution, interference of differences existing in water bath temperatures of different positions in the thermostatic water bath case is eliminated, the obtained standard ethanol concentration of the reference solution has extremely high reference value, the breath alcohol testers are tested on conformance in a batched mode, the test repeatability is good, errors are determined, the breath alcohol testers are uniformly calibrated according to the errors, the calibration precision is improved, and the calibration result is accurate and reliable.

The invention provides a method for conducting partial heat treatment on martensitic precipitated hardening stainless steel after repair welding. The method can solve the problems that in an existing partial heat treatment method, the heating temperature is difficult to control, and the temperature uniformity is poor. An induction heating method is used for conducting partial heat treatment on a repair welded part. The method is characterized in that before partial heat treatment is conducted, the heating temperature for partial heat treatment of the repair welded part is calibrated, through calibration of the heating temperature for partial heat treatment, the difference between the temperature of a surface infrared temperature sensor and the inner temperature of the part in the heating process is determined, and according to the temperature difference, the actual heating temperature for induction heating in the partial heat treatment process is determined.

A computer-implemented method of calibrating a camera comprises the steps of: a. acquiring a video stream from said camera (CAM), and displaying it on a screen (DY); b. displaying on the screen, superimposed to the video stream, a representation of a target area (102); c. detecting a calibration pattern (100) in the video stream and periodically check whether it fits within the calibration area; d. when the calibration pattern is found to fit within the calibration area, extracting an image thereof from the video stream; said steps a. to d. being iterated a plurality of times using respectivetarget areas corresponding to different positions of a physical support (101) carrying the calibration pattern; and then e. estimating intrinsic calibration parameters of the camera by processing saidimages. A computer program product, computer-readable data-storage medium and computer system for carrying out such a method are disclosed.

The invention discloses a vehicle parameter calibration method. The method includes the steps of 1, collecting vehicle data; 2, conducting vehicle dynamics formula calculation and curve fitting; 3, establishing a simulation vehicle model; 4, applying a batch processing program; 5, verifying vehicle parameters. The method has the advantages that through repeated verification calculation based on avehicle dynamics formula and software, the calculation result is obtained from actual experiments and can also be calibrated in an interference-free simulation environment, so that the parameter calibration result is more reliable; meanwhile, by using the batch processing program in combination with an optimization algorithm to assist in parameter selection, the calibration time can be greatly shortened, and the calibration accuracy can be improved.

The invention provides a correction method and system for a CMOS image sensor and image processing equipment, and the method comprises the following steps: obtaining an initial environment temperature after the CMOS image sensor is powered on; acquiring an image required by correction, and calculating a correction parameter according to the image required by correction; acquiring an environment temperature change value; judging whether the environment temperature change value is greater than or equal to a preset environment temperature change value; if yes, obtaining the image needed by correction again, calculating the correction parameters again, and obtaining the corrected correction parameters; and correcting the CMOS image sensor according to the corrected correction parameters. In the working process of equipment, the correction parameters of the CMOS image sensor can be corrected according to the environment temperature change condition, the accuracy and reliability of the correction parameters are improved, the temperature adaptability of the CMOS image sensor is improved, the correction result is accurate and reliable, column noise is effectively eliminated, and the image quality is improved.

The invention relates to a device and method for measuring ultrasonic power in a half-noise-elimination water tank. The device mainly comprises the half-noise-elimination water tank and an electronic instrument. The half-noise-elimination water tank comprises a transparent circular tube with scale lines, an upper cover plate and a lower cover plate. A reflection target is fixed through a thin chain located on the upper cover plate and then is suspended in the half-noise-elimination water tank. An ultrasonic transmitter is fixed to the water surface in the middle of the upper cover plate. The radiating surface of the ultrasonic transmitter is immersed under water. The ultrasonic transmitter transmits sound waves downwards from the upper portion of the half-noise-elimination water tank. A sound absorption material layer is pasted to the lower cover plate used for sealing the bottom of the transparent circular tube. The sound absorption material layer absorbs the sound waves transmitted into the lower cover plate. The device and method have the advantages that the reflection target is used for ultrasonic power measurement in the water tank, and reflected waves can be prevented from influencing a measurement result on the condition of a certain distance, so that the measuring process is clear and discernible; when the device and method are used for ultrasonic power measurement, the outstanding advantages that the site state is grasped at any time, anomaly is analyzed, and the effectiveness and the working efficiency of measurement are improved are achieved.

The invention relates to a method for realizing on-site calibration of a synchronous transmitter / resolver, and is especially suitable for the calibration requirement of a synchronous transmitter / resolver that is difficult to disassemble on large equipment. The special power supply system that supplies power to the airborne experimental equipment at the experiment / work site provides reference signals. Based on the characteristics of the angular position indicator that can directly measure the vector angle and is light and easy to carry, it will pass the verification / calibration of the superior organization, and the accuracy level will be calibrated. The angular position indicator which is more than three times (or an order of magnitude) higher than the synchronous transmitter / resolver is used as a calibration standard device, and the output angle value of the calibrated device is directly measured at the experiment / work site, and the calculation error and uncertainty are completely and accurately calculated calibration data. This method enables field calibration of a synchronous transmitter / resolver.

The invention relates to a method for on-site calibration of a ground hydraulic tester, which is especially suitable for the calibration requirements of digital display meters that are difficult to disassemble on large equipment. The working site is used to provide reference signals for the power supply system of airborne experimental equipment. Based on the characteristics that the calibrator can directly measure the pressure value and is light and easy to carry, it will pass the verification / calibration of the superior institution, and the accuracy level is five times higher than that of the digital display meter being calibrated. The above calibrator is used as the standard equipment for calibration, and directly measures the output pressure value of the equipment being calibrated at the work site, and calculates the error and uncertainty to obtain complete and accurate calibration data. This method can calibrate the digital display meter on site.

The invention discloses a dynamic calibration method for a portable braking tester and comprises the following steps: a. an acceleration sensor of the braking tester to be calibrated is mounted on a fixed mechanism of the acceleration sensor; b. a control processing module controls a driving mechanism, and a rotating shaft is driven by the driving mechanism to rotate; c. an angle sensor transmitsangle signals of the rotating shaft tested at different times to the control processing module, and the braking tester transmits acceleration signals tested at different times to the control processing module; d. the control processing module calculates an actual deceleration-time curve according to the input angle signals and an actual measurement deceleration-time curve of the braking tester according to the input acceleration signals, and by comparing the two curves, calculates the MFDD indication error. The method has the advantages of exact and reliable calibration result, high calibration efficiency, high operability and repeatability, can guarantee the personal and property safety, and greatly reduces the cost of dynamic calibration.

The invention discloses a system and a method for measuring frame delay time of a photographing system of an optical measurement device. The system comprises an image recording apparatus (1), a photographing system (2), a timing terminal (3), a control and display LED (Light-Emitting Diode) lamp array apparatus (4) and an LED lamp array (5). The method comprises the following steps of: judging the number of image outputting delay frames of a video camera, according to the time information on a digital image output by the photographing system and the information of the LED lamp array; providing time and external interruption signals by the timing terminal; recording the image of the photographing system and superposing the time information of the recording moment by the image recording apparatus; controlling an LED array to turn on or turn off the LED lamps by the control and display LED lamp array apparatus according to the external interruption signal and the time information; and imaging the LED array by the photographing system. The system and the method provided by the invention realize accurate calibration on image outputting delay time of the photographing system.

The invention discloses a method for calibrating frequency transient parameters of power supply characteristics of an aircraft power supply, and belongs to the technical field of electrical measurement. The invention evaluates the uncertainty evaluation introduced by the discrete Hilbert transform algorithm in the process of frequency transient parameter calibration. The transformation algorithm obtains the instantaneous frequency. Analyze the uncertainty introduced by the discrete Hilbert transform error caused by the endpoint effect caused by insufficient sampling rate when the frequency changes instantaneously. According to the principle of discrete Hilbert transform to obtain the instantaneous frequency, the relationship between the instantaneous frequency and the original signal and the Hilbert transform of the original signal is established. Based on the numerical simulation technology, the error introduced by the end effect is calculated under different sampling rates, and then the evaluation is carried out. Uncertainty, improve the uncertainty analysis of the calibration results of the frequency transient parameters of the aircraft power supply characteristic test system, making the calibration results more accurate and reliable.