Abstract: The present invention provides a heating tray for a vacuum hopper precharger, wherein a heating part is configured in a tray having a secondary battery mounted thereon to allow heat generated from the heating part to be circulated inside a vacuum hopper precharger and to be transferred to the entire secondary battery so that the activity of an electrolyte inside the secondary battery is improved, and according thereto, a large amount of residual gas and impurities can be discharged so as to increase purity of the secondary battery. Particularly, the secondary battery can be fully charged with an electrolyte inside the vacuum hopper precharger, thereby improving productivity compared to a conventional configuration in which a secondary battery is charged with an electrolyte at 60% to 70% inside a vacuum hopper precharger and then charged with a remaining charge amount in another process so as to be fully charged.

Abstract: Disclosed is a laser rangefinder and method thereof. By using characteristics that noise has non-correlation and signals have correlation, laser beams are output to a target to find a range to the target with iteration rates of thousands of times per second, signals for each range-finding are binary-quantized using a sampling frequency corresponding to a range-finding resolving power, and data are accumulated. After this, the accumulated data are processed in a statistical manner to detect a target signal and produce a target range based on the target signal. According to the present invention, the rangefinder for outputting low-power laser beams, using the laser beams reflected from the target, and detecting a range to the target, easily and accurately detects target signals in the noise.

Abstract: Disclosed is a laser rangefinder and method thereof. By using characteristics that noise has non-correlation and signals have correlation, laser beams are output to a target to find a range to the target with iteration rates of thousands of times per second, signals for each range-finding are binary-quantized using a sampling frequency corresponding to a range-finding resolving power, and data are accumulated. After this, the accumulated data are processed in a statistical manner to detect a target signal and produce a target range based on the target signal. According to the present invention, the rangefinder for outputting low-power laser beams, using the laser beams reflected from the target, and detecting a range to the target, easily and accurately detects target signals in the noise.