The Infrared radiation experiments on bolt and rock in the process of loading were carried out. The results show
that the infrared radiation temperatures rise wholly and uniformly before stress peak with increase of loading.
The bolted rock presents local dissimilation in the thermal image after stress peak. The multi-layer round infrared
radiation isothermal lines is formed around bolt. The temperature is gradually reduced from inside to outside.
There are two kinds of infrared omens for bolted rock fracturing, i.e., the infrared thermal image anomaly and
curve of infrared radiation temperature and time anomaly, which reflect the spatial and temporal features of
infrared omens respectively.
The Infrared radiation experiments on bolt and rock in the process of loading were carried out. It was found that the
infrared radiation temperatures of non-bolted block rose wholly and uniformly before stress peak with increase of
loading. The bolted rock presented local dissimilation in the thermal image after stress peak. The multi-layer
round infrared radiation isothermal lines were formed around bolt. The closer from the bolt centre, the higher, the
farther from the bolt centre, the lower temperature was. The temperature was gradually reduced from inside to
outside. The change of infrared radiation temperature fields responded to stress fields around bolt. The high
infrared radiation isothermal lines corresponded with the high stress areas. The low infrared radiation isothermal
lines corresponded with the low stress areas.
Natural rubidium is a mixture of the two isotopes, 85Rb and 87Rb. Taking into account their hyperfine structure, and using a quantum-mechanical treatment of the resonant Faraday effect, we calculate the transmission, central frequency shift and pass bandwidth of Rb 780 nm Faraday- Zeeman optical filter, as functions of magnetic field strength and atomic cell temperature.
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