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Modeling of Vibration Sensing with Variable Fabry-Perot System
Issue:
Volume 2, Issue 1, February 2013
Pages:
1-6
Published:
20 February 2013
Abstract: The application of Fabry-Perot (FP) system for vibration sensing is theoretically analyzed and successfully demonstrated by simulation. The separation between the reflecting mirrors of the FP is varying in accordance with the sensed vibration that is in contact with the freely movable mirror. The variable separation is modeled as a small uniform sinusoidal perturbation that satisfies the constructive multiple beam interference inside the cavity. The variation of the separation between the two mirrors of the FP induces a phase variation to the reflected laser beam employed in the system. The constructed signals by signals processing and transformation reveal the effectiveness of the method for vibration sensing and hence the applicability for gravitational and seismic waves monitoring.
Abstract: The application of Fabry-Perot (FP) system for vibration sensing is theoretically analyzed and successfully demonstrated by simulation. The separation between the reflecting mirrors of the FP is varying in accordance with the sensed vibration that is in contact with the freely movable mirror. The variable separation is modeled as a small uniform si...
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Nonlinear Amplification of the Brillouin-Rayleigh Triplet Caused by Two-Photon Heating
V. B. Karpov,
V. V. Korobkin
Issue:
Volume 2, Issue 1, February 2013
Pages:
7-16
Published:
20 February 2013
Abstract: The thin structures of stimulated Brillouin scattering (SBS) and stimulated temperature scattering (STS) spectral components caused by two-photon heating are analyzed theoretically. In contrast to the linear (single-photon) case for two-photon heating a stokes SBS component exhibits the spectral shift depending on the pump intensity. Emergence of an anti-stokes SBS component is possible when the pump intensity is sufficiently high so that the positive two-photon thermal gain may compensate the negative electrostrictive gain. The spectral components of STS caused by linear or two-photon absorption (essentially different linear or two-photon STS-2) possess the same thin structures.
Abstract: The thin structures of stimulated Brillouin scattering (SBS) and stimulated temperature scattering (STS) spectral components caused by two-photon heating are analyzed theoretically. In contrast to the linear (single-photon) case for two-photon heating a stokes SBS component exhibits the spectral shift depending on the pump intensity. Emergence of a...
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Conditions and Probability of electron-Photon Interactions
Issue:
Volume 2, Issue 1, February 2013
Pages:
17-24
Published:
20 February 2013
Abstract: In that paper some aspects of electron-photon interactions are discussed. Although that subject has already been treated in many publications there are still some unsolved problems: like relationship between photon duration and electron transit time, or conditions and probability of interaction processes. These are addressed in this paper and new results are obtained. For example, the electron-photon interaction process can only occur if the electron transit time from an energy level to another one is equal to the length of the photon in time or by other words to the duration of the interacting photon. That means the energy transfer in a specific process requires a specific processing time, i.e. the processing time and the processing energy are strictly connected to each other. If these two conditions are not satisfied simultaneously the interaction cannot be carried out. Further, it can be stated: time is passing as changes occur in the state of the material, like changes in its energy level, location, motion, composition, etc. To perform such a change, some energy is needed. If the inherent energy of a specific physical process which is utilized to carry out the change in the state of material is higher, the change is carried out in a shorter time. This relationship presents strict connection between energy and time
Abstract: In that paper some aspects of electron-photon interactions are discussed. Although that subject has already been treated in many publications there are still some unsolved problems: like relationship between photon duration and electron transit time, or conditions and probability of interaction processes. These are addressed in this paper and new r...
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Cleanness Evaluation Method of Remaining Dirt on Inner Surface of Narrow Tubule by IR Spectroscopy
Shouhei Koyama,
Yuki Miyauchi,
Hiroaki Ishizawa
Issue:
Volume 2, Issue 1, February 2013
Pages:
25-31
Published:
20 February 2013
Abstract: We try to develop a new measurement method for cleanliness evaluation of inner surface of narrow tubule.In this measurement method, we use the infrared spectroscopy and the partial least squares regression (PLSR).The absorption spectrum is measured by using fiber probe and cone mirror.We measure the spectra of the known amount of dirt.We build a calibration curve using these spectra and the PLSR.Next, we measured spectrum of inner surface of narrow tubule, and calculates the amount of remaining this dirt by the calibration curve.This method can be measured in a non-contact and non-destructive.This method can identify the remaining position and the type and amount of dirt.In this paper, we propose this measurement method as new cleanliness evaluation method has overcome the problems that exist in the cleanliness evaluation.
Abstract: We try to develop a new measurement method for cleanliness evaluation of inner surface of narrow tubule.In this measurement method, we use the infrared spectroscopy and the partial least squares regression (PLSR).The absorption spectrum is measured by using fiber probe and cone mirror.We measure the spectra of the known amount of dirt.We build a ca...
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