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

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.

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 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.