Humidity and Temperature Effects on LaCoste & Romberg Gravimeters.
Humidity and Temperature Effects on LaCoste & Romberg Gravimeters.
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湿度和温度对 LaCoste 的影响
DOI：
10.11366/sokuchi1954.47.10
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
M. Ruymbeke
中科院分区：
文献类型：
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作者：
Abdelbar El Wahabi;B. Ducarme;M. Ruymbeke
LaCoste & Romberg（LCR）重力仪能够记录从几天到几个月的小的非潮汐重力变化，如果校正由于空气温度和湿度的仪器效应。利用同一台重力仪（LCR G906）在五个测站进行了试验，确定了短期和中期的温度效应。在Belgium，LCR G906安装在超导重力仪C021旁边，湿度和温度非常稳定，在消除LCR G906信号的长期漂移后，两台仪器记录的重力变化在微伽水平上一致。为了使LCR重力仪在温湿度不稳定的台站也能得到类似的结果，在比利时皇家天文台（ROB）的布鲁塞尔基本台站，利用LCR G8重力仪进行了气象影响的试验研究。该重力仪显示了与湿度信号的相关性，时间超过10天。当湿度达到35%时，它的反应几乎是瞬间的，在三个月内稳定地上升了1.5毫伽以上，当湿度恢复正常时，它也会类似地下降。我们发现LCR G8的行为就像空气湿度变化的积分器。通过这个实验，我们部分地满足了Bastien等人（1990）的结果，并且我们显著地提高了对LCR重力仪在湿度效应方面的行为的理解。由于每台重力仪的反应是不同的，因此应对每台仪器进行类似的实验。
LaCoste & Romberg (LCR) gravimeters are able to record small non tidal gravity variations for periods ranging from some days to several months if one corrects the instrumental effects due to air temperature and humidity. An experiment has been carried out in five stations using the same gravimeter (the LCR G906) and the temperature effect was established for short and medium periods. At Membach (Belgium), the LCR G906 was installed next to the superconducting gravimeter C021 in very stable conditions of humidity and temperature and after removing a long term drift from the LCR G906 signal, the gravity variations recorded by both instruments agree at the microgal level. In order to reach a similar result with LCR gravimeters in stations where the temperature and humidity are not stable, some experiments were performed in the fundamental station of Brussels in the Royal Observatory of Belgium (ROB) using the LCR G8 to study the meteorological influences. This gravimeter showed a correlation with the humidity signal for periods longer than 10 days. To a humidity step of 35%, it reacted quasi-instantaneously by going steadily up by more than 1.5 milligal in three months and going down similarly while the humidity was returning to normal. We showed that the LCR G8 behaves like an integrator of air humidity changes. With this experiment, we partially met the result of Bastien et al (1990) and we significantly improved the understanding of the behaviour of LCR gravimeters on what concerns the humidity effect. As the reaction of each gravimeter is different, a similar experiment should be performed for each instrument.