| 摘要 |
<p>The invention relates to industrial physics, in particular to the class of devices used for investigating the internal structure of objects, and can be used in medicine for diagnosis of the state of individual organs and systems in a human subject, in particular for optical coherence tomography, and in industrial diagnostics, e.g. for monitoring industrial processes. The aim of the invention is to create an optical fibre interferometer which, when used as part of an optical coherence tomography system, will permit investigation of mediums with low characteristic times for changes in characteristics or position relative to the optical probe, for example in in vivo investigation of tissues. Another aim of the present invention is to produce an optical fibre piezo-electric transducer suitable for use in an optical fibre interferometer to ensure that the mediums in question are scanned to the requisite depth. In the optical fibre interferometer as developed, the piezo-electric transducer in the form of an optical fibre controlled delay line serves as the optical fibre part of the interferometer leg which allows the virtual inertia-free adjustment of the length of the interferometer leg and therefore adjustment of the difference in optical lengths of the legs by a factor of at least several tens of times the working wavelengths of the interferometer. The optical fibre piezo-electric transducer as designed takes the form of an optical fibre piezo-electric controlled delay line and comprises a piezo-ceramic wafer on the opposing surfaces of which are provided electrodes and an optical fibre. It is expedient to make the wafer in the form of a disc and to lay the fibre in a spiral, which ensures that the length of the optical fibre can be altered within broad limits without inertia and with a transducer of small dimensions.</p> |
