Abstract: A laser liquid level detection device is provided with linear optical magnification of a curved minor. The device includes a laser device, a CCD detecting device having a curved mirror and a CCD sensor and signal processing devices disposed in the laser device and the CCD detecting device. The laser device emits a laser beam to a surface level of a liquid, which reflects the beam to the CCD detecting device, and the curved mirror directs the reflected beam onto the CCD sensor. The shape of the curved mirror is determined by a polynomial curve function so as to linearly magnify a change in a height of the surface when the bounced beam reaches the CCD sensor. The liquid level detection device enables the position of the surface level of the liquid to be detectable in real time with high accuracy.

Abstract: The present invention discloses a laser liquid level detection device with linear optical magnification of a curved minor, wherein two openings are disposed at a top of a single crystal furnace symmetrically, a laser device and a CCD detecting device are respectively disposed on the two openings, and signal processing devices are pre-disposed within the laser device and the CCD detecting device. In the liquid surface height detection method using the device of the present invention, a model is first established to simulate the laser propagating path, a polynomial curve function of the curved mirror satisfying the requirement is calculated, the prepared curved minor is then disposed in the CCD detecting device, the change in the height of the liquid surface of molten silicon may be reflected on a CCD sensor, and therefore the actual change in the height of the liquid surface of molten silicon may be calculated.