51results about How to "Eliminate accidental errors" patented technology

The invention discloses a hydrophone sensitivity calibration method based on sine function fitting, and the method comprises the following steps: adopting a hydrophone sensitivity calibration system which is mainly composed of a sound source, a to-be-measured hydrophone, a standard hydrophone and a data processor, and enabling the data processor to record an output signal of the to-be-measured hydrophone and an output signal of the standard hydrophone; constructing a fitting function, fitting the two paths of hydrophone output signals, and obtaining signal peak-to-peak values corresponding tofundamental frequency items in the two paths of hydrophone output signals by utilizing a fitting coefficient; and substituting the fitting coefficient into a hydrophone sensitivity calculation formulato obtain the sensitivity of the to-be-measured hydrophone. According to the invention, accidental errors of a manual reading calibration method are overcome, and the measurement precision and repeatability of the sensitivity of the hydrophone are improved.

The invention provides a cross radiation calibration method and system for a large observation angle sensor. The method comprises steps that a to-be-calibrated image and a reference image are registered, random sampling of each set of corresponding wave bands of the to-be-calibrated image and the reference image is respectively carried out to acquire corresponding calibration points; for each wave band, cross calibration for each pair of calibration points is carried out respectively, a BRDF adjusting coefficient is established as a ratio of a surface bidirectional reflection distribution function of the to-be-calibrated image and a surface bidirectional reflection distribution function of the reference image, and processing is carried out in an iteration mode; for each wave band, points with average mean values greater than a preset threshold are deleted from the cross calibration result, averaging is carried out, and a final radiation calibration coefficient is acquired. The method is advantaged in that BRDF values of the to-be-calibrated image and the reference image can be respectively calculated without a complex model, calculation is simple and stable, strong operationality is realized, and an error caused by introducing auxiliary data for BRDF calculation and influence of abnormal calibration points on the result can be further avoided.

The invention relates to medical dialyzing paper compression resistance multilevel test equipment. The equipment comprises a test bottom plate and test dialyzing paper. A tension test device is installed in the middle of the upper end face of the test bottom plate. Two tensioning devices are symmetrically installed on the two sides of the upper end face of the test bottom plate. The head end of the test dialyzing paper penetrates in the tensioning device located on the right side of the test bottom plate. The middle of the test dialyzing paper penetrates through the tension test device. The tail end of the test dialyzing paper penetrates out of the tensioning device located on the left side of the test bottom plate. The tension test device can be used for conducting a three-level tension test on the test dialyzing paper under the assistance of the two tensioning devices. The average value of three tension test values is taken as the final test value, so that accidental errors existing in a manual tension test are eliminated, and the compression resistance test precision is high; the tensioning devices can conduct self-tension adjustment on the two sides of the test dialyzing paper, and therefore manual tension adjustment is not needed. Through the equipment, a precise and automatic tension test function of compression resistance of the dialyzing paper can be achieved.

The invention discloses a rapid analysis method for the fineness of nitrocellulose, which comprises the following steps: taking at least three samples of different fineness of nitrocellulose to be tested, and analyzing the fiber length of the nitrocellulose samples, said The fiber length of the nitrocellulose sample is the weighted average of the length of the nitrocellulose sample; the fineness of the nitrocellulose sample is determined by the existing analysis method of the fineness of the nitrocellulose; the fiber length and the fineness of the measured nitrocellulose sample are Degree of linear fitting, get the relationship: fiber length = a × fineness + b, that is, the relationship between the length of the nitrocellulose fiber and the degree of fineness. The invention does not require sample pretreatment and drying, does not need to add water and shake, simplifies the multi-step water adding and shaking process, reduces power consumption and water consumption; the analysis period is shortened from 3 hours to 10 minutes, improves the analysis efficiency, and simplifies the operation process ; Can effectively eliminate human and other accidental errors, can effectively predict the fineness of nitrocellulose, and effectively guide production.