2 edition of **Applications of the coherence function in comparing seismometers** found in the catalog.

Applications of the coherence function in comparing seismometers

Samuel D Stearns

- 355 Want to read
- 34 Currently reading

Published
**1979**
by Dept. of Energy, Sandia Laboratories, for sale by the National Technical Information Service] in [Washington], [Springfield, Va
.

Written in English

- Seismometers

**Edition Notes**

Statement | Samuel D. Stearns, Ground Motion and Seismic Division, 1111, Sandia Laboratories ; prepared by Sandia Laboratories for the United States Department of Energy |

Series | SAND ; 79-1633 |

Contributions | United States. Dept. of Energy, Sandia Laboratories, Sandia Laboratories. Ground Motion and Seismic Division, 1111 |

The Physical Object | |
---|---|

Pagination | 33 p. : |

Number of Pages | 33 |

ID Numbers | |

Open Library | OL14883526M |

It is well known that the coherence function, which is given by the ratio between the modulus of the CSD and the product of the two PSDs, assumes value ≤ 1. The proximity to the unit is a measure of the correlation between the two signals, while the deviation from the unit is to be related to non-linearity in the structure or to the presence Cited by: 2. A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text.

Comparing and Contrasting What this handout is about This handout will help you first to determine whether a particular assignment is asking for comparison/contrast and then to generate a list of similarities and differences, decide which similarities and differences to focus on, and organize your paper so that it will be clear and effective. Modern instruments use electronic sensors, amplifiers, and recording devices. Most are broadband covering a wide range of frequencies. Some seismometers can measure motions with frequencies from Hz to Hz (1/ = seconds per cycle, to 1/ = seconds per cycle).

Cross-Spectra and Coherence Deﬁnitions “Coherence” is a measure of the degree of relationship, as a function of frequency, between two time series, {p>|p. The concept can be motivated in a number of ways. One quite general form is to postulate a convolution relationship, X4 |p = dn{p n +qp () 4. Renewed interest in laser communication systems has sparked development of useful new analytic models. This book discusses optical scintillation and its impact on system performance in free-space optical communication and laser radar applications, with a detailed look at propagation phenomena and the role of scintillation on system behavior.

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Get this from a library. Applications of the coherence function in comparing seismometers. [Samuel D Stearns; United States. Department of Energy.; Sandia Laboratories.; Sandia Laboratories.

Ground Motion and Seismic Division, ]. Then an estimate of the coherence, the sample coherence function, may be defined by Note that the averaging in the numerator occurs before the absolute value is taken.

The coherence is a real function between zero and one which gives a measure of correlation between and at each frequency. S.D. Steams, Applications of the Coherence Function in Comparing Seismometers, preprint, Albuquerque (). S.D. Steams, Digital Signal Analysis, Hayden (). [12] G.C. Carter et al., Estimation of the magnitude-squared coherence function via overlapped Fast Fourier Transform processing, IEEE Trans.

Au(4) Augustp. Cited by: A book of the names and address of people living in a city. How should these seismometers be oriented. 'Applications of the coherence function in comparing seismometers' -- subject(s.

Coherence Function in Matlab. In Matlab and Octave, cohere(x,y,M) computes the coherence function using successive DFTs of length with a Hanning window and 50% overlap. (The window and overlap can be controlled via additional optional arguments.) The following matlab illustrates cohere on.

Request PDF | A Comparison of Seismic Instrument Noise Coherence Analysis Techniques | The self-noise of a seismic instrument is a fundamental characteristic used to evaluate the quality of the. An important application of Dynamic Signal Analysis is characterizing the input-output behavior of physical systems.

In linear systems, the output time history, y(t), can be predicted from a known input time history, x(t) if the Frequency Response Function (FRF) of the system is known.

As illustrated later, the coherence function is insensitive to phase. Coherence is a normalized cross-power spectrum that can be used as a measure of the spectral similarity of two signals, or as a measure of the degree to which two signals have a common source.

The left panel is a comparison of a modern broadband seismometer response and the classic World-Wide Standard Seismic Network (WWSSN) long- and short-period instruments. The same broad-band response is shown in the right panel, to compare the response with a special short-period instrument, the Wood-Anderson, and an accelerometer.

The Spectral Coherence Function In this post I introduce the spectral coherence function, or just coherence. It deserves its own post because the coherence is a useful detection statistic for blindly determining significant cycle frequencies of arbitrary data records. Seismic Application Test Using the three sensor coherence technique, we hope to determine the self-noise of three STS2 low-gain seismometers and compare these sensor noise estimates to the standard STS2 low-gain seismometer noise model by C.

Hutt of USGS/ASL (see acknowledgments), which from here on we will refer to as STS2 NM. This. In signal processing, the coherence is a statistic that can be used to examine the relation between two signals or data sets.

It is commonly used to estimate the power transfer between input and output of a linear system. • Temporal and spatial coherence • Spatially incoherent imaging – The incoherent PSF – The Optical Transfer Function (OTF) and Modulation Transfer Function (MTF) – MTF and contrast – comparison of spatially coherent and incoherent imaging next two weeks • Applications of the MTF •.

Coherence function refers to a normalized version of the cross-spectrum defining the linear relationship between two signals in the frequency domain. To estimate the noise level of the PSS after the impact test, we calculated the coherence among microtremors observed by the three types of seismometers.

The coherence function can be used to provide preliminary estimates of the system's signal-to-noise ratio (Holcomb, ).Cited by: A new method is presented for the self-noise estimation of a seismometer using a single, side-by-side, reference instrument and taking into consideration the misalignment in the orientation of.

Near 1 Hz, the nighttime PSD estimates (green lines) are similar for both seismometers, consistent with the high coherence and transfer function near 1 shown in Fig. 6, but in the daytime estimates (red), the power on the deck is higher by ∼ 10 dB, which demonstrates the greater noise on the deck due to air conditioning airflow.

At long Cited by: 2. JCZ-series seismometers are characterized by full-band coverage with low-frequency output extending to solid tides (Cai et al., ). CTS-series seismometers are very-broadband feedback seismometers with wide dynamic ranges (Cai et al., ). The CTS borehole seismometer circuit parameters are designed almost identical to those of the CTSAuthor: Penghui Wang, Yunyao Zhou, Yongqing Lv, Ya Xiang.

Seismometers are instruments that measure and record motions of the ground, including those of seismic waves generated by earthquakes, nuclear explosions, and other seismic sources. Name two uses for seismometers.

Unanswered Questions. How old is marianna proestou. SB-9 When is a sailboat the stand-on vessel in relations to a recreational power boat. Samuel D Stearns has written: 'Applications of the coherence function in comparing seismometers' -- subject(s): Seismometers Asked in Authors, Poets, and Playwrights What has the author Martha.Well, nothing is wrong with it except for one thing it sometimes read the wrong information out like when it says there is going to be a major earthquake it turns out to be a GREAT earthquake.Spatial coherence.

In some systems, such as water waves or optics, wave-like states can extend over one or two dimensions. Spatial coherence describes the ability for two points in space, x 1 and x 2, in the extent of a wave to interfere, when averaged over precisely, the spatial coherence is the cross-correlation between two points in a wave for all times.