Abstract: Provided are an imaging method and system for residual stress of a basin insulator and a method for preparing a test block. The imaging method includes cutting and preparing a standard industrial sample of a basin insulator and testing the acoustoelastic coefficient of the standard industrial sample; then obtaining the residual stress data of the basin insulator and obtaining the spatial point sound velocity distribution of the basin insulator; finally, obtaining a stress distribution cloud map of the basin insulator by calculation of the attribute value and the coordinate data of a to-be-measured location, and performing reliability verification based on the residual stress data.

Abstract: A flushing device configured to connect a toilet to a water tank includes a flushing vertical pipe configured to be connected to the water tank; a flushing lateral pipe configured to be connected to the toilet; and a connecting bend pipe configured to be connected between a lower end of the flushing vertical pipe and a first end of the flushing lateral pipe. An inner diameter of the flushing vertical pipe is larger than an inner diameter of the connecting bend pipe and larger than an inner diameter of the flushing lateral pipe.

Abstract: An interferometric displacement measurement apparatus (100) includes at least one measurement interferometer (103) for measuring a change in optical path difference between a measurement beam (150) and a reference beam. A light source module (118) is arranged to generate a modulated light beam, having a particular optical spectrum, from which the measurement beam and reference beam are derived. A data acquisition and analysis module (105) can determine a measure representative of the displacement using interference intensity data received from a photodetector (111) which detects the interference of the measurement beam with the reference beam.