2results about How to "Reliable exclusion" patented technology

The invention discloses a nondestructive testing method and system for grouting compactness of a prefabricated bridge pier duct, particularly relates to the technical field of nondestructive testing of materials, and is used for solving the problem that an existing ultrasonic testing technology is insensitive to microcosmic nonuniformity response of a grouting material. The method comprises the following steps: transmitting a first fundamental frequency ultrasonic incident signal into a prefabricated bridge pier duct, collecting a reflection echo signal, repeatedly executing to obtain a plurality of echo signals, calculating a coherence coefficient, and judging whether the coherence coefficient is higher than a preset threshold value or not to perform macroscopic defect screening. When the coherence coefficient is higher than the threshold value, at least one second fundamental frequency ultrasonic incident signal is emitted, corresponding echo signals are collected, the waveform asymmetry coefficient of each echo signal is calculated, and finally the microcosmic non-uniformity of the grouting material is evaluated based on the variation trend of the waveform asymmetry coefficients under different fundamental frequencies. And comprehensive grouting quality evaluation from macroscopic to microscopic is realized.

The invention relates to a sanitary configuration system (1) comprising at least two switches (2, 3), wherein each switch (2, 3) has one water inlet (4) and at least two water outlets (5, 6), the first water outlet (5) of the first switch (2) is fluidically connected with the water inlet (4) of the second switch (3) and at least one water outlet (5, 6) of the second switch (3) has a detachable interface (8) for fluidically connecting with a water outlet device (9), wherein the first switch (2) is a monostable switch and the second switch (3) is a bistable switch. In this way a series connection of switches can be realized, wherein a switching between different water outlets is possible.