5 results about "GOT measurement" patented technology

The application provides a kind of terahertz wave power distribution measurement method based on circular sensor, belong to engineering and physical experiment measurement technical field, this method includes: obtaining the quantitative relationship of the output total power of circular sensor and the power density of measurement plane;Establish the resolution of the measured power distribution image of measurement plane, the constraint condition of measurement back-propagation error and the translation step of sensor;According to the translation step control of sensor, the translation measurement of circular sensor in measurement plane is carried out, to obtain the measurement power data set;According to the resolution, the measurement plane is discretized and the objective function is constructed, and the discrete power density of the measurement plane is obtained by solving the objective function;The measured power distribution image of measurement plane is reconstructed, and the measured power distribution image of measurement plane is output.The application has the advantages of high precision, adjustable resolution and controllable error, and is suitable for high-precision measurement scenarios of various engineering and physical experiments.

The invention discloses a signal processing circuit and method for gas measurement, electronic equipment and a storage medium. The signal processing circuit comprises an operational amplifier circuit, a sampling hold circuit, a first differential circuit and a second differential circuit, the operational amplification circuit is used for receiving the detection signal and amplifying the detection signal; the sampling and holding circuit is used for separating a reference signal and a measurement signal in the detection signal, respectively carrying out sampling and holding on a high-level signal and a low-level signal in the reference signal, and respectively carrying out sampling and holding on a high-level signal and a low-level signal in the measurement signal; the first differential circuit is used for removing interference of background slow-varying noise while obtaining a reference signal; and the second differential circuit is used for removing the interference of the background slow-varying noise while obtaining the measurement signal. According to the signal processing circuit and method for gas measurement, the electronic equipment and the storage medium provided by the invention, the influence of background slow-varying noise can be eliminated, and the accuracy and stability of measurement are ensured.

This invention provides a method for measuring the rotational error of a machine tool spindle based on installation error correction. A high-precision plane mirror is fixedly installed at the center of the bottom of the spindle tool head using bolts, and a laser interferometer is fixedly installed below the high-precision plane mirror. Before measurement, the corresponding data of different installation error values ​​and their caused residual synchronization errors are quantitatively calculated. Then, the installation error control range required to keep the residual synchronization error caused by the installation error within the required measurement accuracy is calculated. During testing, the installation error of the measuring device is obtained. Then, the installation error is adjusted by adjusting the installation position of the laser interferometer until the maximum amplitude of the basic synchronization rotational error extracted from the measurement data (i.e., the installation error) reaches the required installation error range. After the installation error of the measuring device is adjusted, data is collected to obtain the total axial rotational error data of the spindle, and the axial synchronous and asynchronous rotational errors of the spindle are calculated.

The application discloses a normal distribution-based equivalent ground reflectivity curve acquisition method, and belongs to the field of space optical remote sensing. The method comprises the following steps: using a spectrometer to measure the ground to obtain measurement data; reading the measurement data to obtain a measurement curve; intercepting the average value of the reflectivity of a relatively stable wavelength interval as the description value of the measurement curve, processing all the measurement curves to obtain a list list1 of the description values; through continuous clustering, counting the classes with higher frequency, and obtaining the maximum value and the minimum value of the class descriptors; counting all the description values of list1 between the maximum value and the minimum value to obtain list3, and calculating the average value a and the standard deviation sigma of list3; the curve corresponding to the descriptor in list1 within the range of [a-1.5*sigma, a+1.5*sigma] is a reserved spectral curve. The method can more effectively eliminate various error data in the reflectivity measurement process, and improve the absolute radiation calibration accuracy.

The invention belongs to the technical field of aircraft design, and particularly relates to a special method for measuring waviness of an aircraft RVSM key area, which comprises the following steps of: manufacturing a target point of a measurement area, and pasting the target point on the measurement area; through target point positioning, surface information of a measurement area is collected and processed to obtain measurement data. Performing theoretical data boundary matching on the measurement data to obtain measurement point cloud data, and performing reference curved surface fitting on the measurement point cloud data to obtain a smooth curved surface; and fitting the smooth curved surface with the actually measured curved surface, and then carrying out waviness parameter analysis to obtain the wavelength, amplitude and waviness parameters of each ripple on the actually measured intersecting line. Through rapid calibration of a measurement system, target point measurement and completion of surface measurement and detection of a measurement area, boundary matching of measurement data and theoretical data, reference curved surface fitting and actual measurement curved surface fitting are started, and finally waviness analysis is performed, so that the measurement precision is greatly improved, and the measurement period is shortened.