System and method for automatically measuring expansion and contraction of soil sample

• Main Authors: LIU XUAN, XIAO YULIN, QIN YUYANG, FENG MAN, XIAO JUAN, DU CHANGCHENG, LIANG ZHILEI, AN TINGTING
• Format: Patent
• Language: Chinese; English
• Published: 02.03.2018
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

A system and method for automatically measuring the expansion and contraction of a soil sample are provided. The measuring system comprises a test bench installed on a supporting chassis. A soil sample to be measured is placed on the test bench. A laser displacement sensor assembly is arranged above the soil sample to be measured and includes three groups of laser heads distributed at the same height. Three groups of laser heads simultaneously emit laser pulses that are reflected by the soil sample to be measured and then are received by the laser displacement sensor assembly. During the measurement, according to the time during which the three groups of laser pulses are emitted, returned, and received, the distances between the three groups of laser heads and the surface of the soil sample to be measured are calculated, and then the vertical height from the laser heads and the surface of the soil sample to be measured is calculated. In combination with the vertical height of the laserheads and the surface of