Marine chronometer

About: Marine chronometer is a research topic. Over the lifetime, 116 publications have been published within this topic receiving 633 citations.

Star viewing chronometer

Abstract: The star viewing chronometer has the function of timing, is synchronous with practical starry sky for observing stars anytime and can be used to determine the position of the sun in ecliptic. It can reach a precision of 4 min for 1000 years between the simulated starry sky and the practical one. It is used in timing and popularizing astronomy knowledge.

A chronometer time measuring device for three -dimensional laser scanning appearance

Abstract: The utility model discloses a chronometer time measuring device for three -dimensional laser scanning appearance relates to the chronometer time measuring technique. This device produces circuit (2000), counter (3000), edge detection circuit (4000), delay chain circuit (5000), look -up table (6000), data storage and output (7000) including PLL clock source (1000), measured signal. The utility model discloses a through the circuit system who designs, come the programming to realize to measure two originated, as to stop incident emergence moment event time spaced chronometer time measurement system through using verilog HDL hardware description language on the use FPGA chip. But wide application in three -dimensional laser scanning, laser rangefinder, the short -and -medium time interval's of absolute gravimeter fields such as measurement.

A synchronous slave device for timing random events

Abstract: A portable synchronous slave device is connected to a mechanical chronometer for the direct reading of time of random events. Synchronism is achieved electromechanically from the break-circuit of the chronometer.