Development and practice of CHZ-Ⅱ marine gravimeter
Marine gravimeter is an important instrument to obtain high-precision and high-resolution marine gravity field,which is mainly used in resource exploration,geoid refinement,marine science research and gravity assisted inertial navigation.The existing marine gravimeters in China mainly rely on foreign imports,which not only have high prices,but also have many inconveniences in the introduction and maintenance of the instruments.With the support of the major scientific instrument pro-jects of the Ministry of Science and Technology,the CHZ-Ⅱ spring type marine gravimeter with completely independent intel-lectual property rights has been successfully developed based on the CHZ marine gravimeter.The new gravimeter uses metal zero length spring as the measuring element,and its unique axisymmetric vertical suspension structure can overcome the cross coupling effect.The application of high-precision servo control technology and strong damping can overcome the influence of carrier disturbance and ensure that the instrument maintains measurement accuracy under different sea conditions.High preci-sion constant temperature technology and temperature compensation technology can eliminate the influence of ambient tempera-ture fluctuation on the measuring accuracy of the instrument.This paper introduces the working principle,system structure,features and test results of the instrument.The static test shows that its monthly drift is better than 3 mGal;the wharf moor-ing test shows that its dynamic accuracy reaches 0.2 mGal,which can clearly reflect the gravity variation characteristics of sea tide;the ship borne test with a total voyage of more than 50 000 nautical miles shows that the comprehensive measurement ac-curacy is better than 1 mGal.To sum up,the accuracy and stability of the instrument have reached the level of the same kind of instruments at home and abroad,which can replace the current imported marine gravimeter.
万方数据
维普
