Profile measuring instrument for liquid storage tank

The invention discloses a liquid storage tank profile measuring instrument. The instrument is composed of a main machine, a probe, a detection cable connected between the main machine and the probe and a cable cleaner, vertical reciprocating motion scanning of the probe in a storage tank is achieved by winding and unwinding the cable, and the position of the probe and pressure and temperature datacorresponding to the probe are continuously collected; the apparent density is calculated by adopting the pressure difference P corresponding to the h-height liquid column, and the apparent density is combined into the relation of the apparent density of the mixed liquid according to different medium content proportions; the method comprises the following steps of (1) performing correlation correction and dynamic correction; and calculating the liquid level of the longitudinal section of the liquid storage tank, the contents, the temperatures, the densities, the purification light component interval, the purification