Abstract: Device for spatially resolved measurement of temperature, strain, or both by Brillouin scattering, with a laser light source (1) for generating a laser radiation, an optical fiber (5) used for the measurement, into which the laser radiation can be coupled in and from which Brillouin signals generated by Brillouin scattering can be coupled out, sensors for detecting the coupled-out Brillouin signals, evaluators for determining spatially resolved from the detected Brillouin signals the temperature, strain, or both of sections of the optical fiber (5), a polarization beam splitter (10, 11) capable of splitting the coupled-out Brillouin—signals into two components (12, 13) having mutually different polarizations, and an optical coupler (16, 17) for admixing a laser radiation to the Brillouin signal.

Abstract: Apparatus for spatially resolved temperature measurement, comprising at least one optical fiber (4) for spatially resolved temperature measurement, at least one laser light source (1), the light (11) from which can be coupled into the optical fiber (4), wherein those components (12, 12a, 12b) of the light (11) produced by the laser light source (1) which are scattered back in the optical fiber (4) can be coupled out of the optical fiber (4) and detected, modulator means (2) permitting the modulation of the light (11) that is to be coupled into the optical fiber (4), and also demodulator means (5, 6) which permit a demodulation of those components (12, 12a, 12b) of the light (11) which are coupled out of the optical fiber (4), wherein the demodulator means (5, 6) are designed as optical demodulator means (5, 6) and/or wherein the modulator means (2) are designed as optical modulator means (2).

Abstract: Fiber-optic cable useful in a borehole is provided, with at least one optical waveguide (2), at least one metallic tube (1) which at least partially surrounds the at least one optical waveguide (2), and at least one additional layer, which at least partially surrounds the at least one metallic tube (1). The fiber-optic cable includes a separator which contributes to or cause mechanical decoupling of individual components of the fiber-optic cable.

Abstract: A device for spatially resolved measuring of a physical variable has a device for generating a first electrical signal with a first frequency and a device for generating a second electrical signal with a second frequency. The second frequency differs from the first frequency by a difference frequency. An optical radiation source generates an optical signal modulated by the first frequency. The optical signal can interact with a test object and be modified in the process. A mixer can mix an electrical signal emerging from the optical signal with the second signal. A device, particularly embodied as a DDS system, generates a third electrical signal with a third frequency that corresponds to the difference frequency or a multiple of the difference frequency. A digital/analog converter digitizes the at least one mixed signal by sampling the mixed signal at the third frequency in order to digitize it.

Abstract: Apparatus for a spatially resolved temperature measurement, with at least one optical fiber (6) for the spatially resolved temperature measurement, and at least one laser light source (2) producing light (3, 23) which can be coupled into the optical fiber (6), wherein the portions of the light (3, 23) backscattered in the optical fiber (6) can be coupled out of the optical fiber (6) and evaluated. The apparatus further includes means for reducing polarization-induced effects, wherein the means may be, for example, a polarization modifier (4) capable of at least partially depolarizing the light (3).

Abstract: A device for calibrating a fiber-optic temperature measuring system has a broadband light source, a coupling-in device, which can couple light generated by the light source for calibration into an optical fiber of the temperature measuring system, a coupling-out device, which can couple components of the light source-generated light that are backscattered in the optical fiber out of the optical fiber. An evaluation device performs a calibration of the temperature measuring system on the basis of the backscattered components of the light.

Abstract: Fiber-optic cable useful in a borehole is provided, with at least one optical waveguide (2), at least one metallic tube (1) which at least partially surrounds the at least one optical waveguide (2), and at least one additional layer, which at least partially surrounds the at least one metallic tube (1). The fiber-optic cable includes a separator which contributes to or cause mechanical decoupling of individual components of the fiber-optic cable.

Abstract: Apparatus for spatially resolved temperature measurement, comprising at least one optical fibre (4) for spatially resolved temperature measurement, at least one laser light source (1), the light (11) from which can be coupled into the optical fibre (4), wherein those components (12, 12a, 12b) of the light (11) produced by the laser light source (1) which are scattered back in the optical fibre (4) can be coupled out of the optical fibre (4) and detected, modulator means (2) permitting the modulation of the light (11) that is to be coupled into the optical fibre (4), and also demodulator means (5, 6) which permit a demodulation of those components (12, 12a, 12b) of the light (11) which are coupled out of the optical fibre (4), wherein the demodulator means (5, 6) are designed as optical demodulator means (5, 6) and/or wherein the modulator means (2) are designed as optical modulator means (2).

Abstract: The invention relates to a device for a spatially-resolved measurement of mechanical parameters, in particular mechanical vibrations, comprising at least one optical fiber (3) for measuring at least one mechanical parameter with spatial resolution, at least one laser light source (1), the light from which can be coupled into the optical fiber (3), wherein in the optical fiber (3), backscattered portions of the light generated by the laser light source (1) can be coupled out of the optical fiber (3), tuning means (2) that can tune the laser light source (1) within a time period of less than 50 ms, detection means that can detect the portions of the backscattered light that are coupled out of the optical fiber (3), and analysis means that can determine at least one mechanical parameter of the optical fiber (3) in a spatially-resolved manner from the captured portions of the backscattered light.

Abstract: A device for spatially resolved measuring of a physical variable has a device for generating a first electrical signal with a first frequency and a device for generating a second electrical signal with a second frequency. The second frequency differs from the first frequency by a difference frequency. An optical radiation source generates an optical signal modulated by the first frequency. The optical signal can interact with a test object and be modified in the process. A mixer can mix an electrical signal emerging from the optical signal with the second signal. A device, particularly embodied as a DDS system, generates a third electrical signal with a third frequency that corresponds to the difference frequency or a multiple of the difference frequency. A digital/analog converter digitizes the at least one mixed signal by sampling the mixed signal at the third frequency in order to digitize it.

Abstract: Apparatus for a spatially resolved temperature measurement, with at least one optical fiber (6) for the spatially resolved temperature measurement, and at least one laser light source (2) producing light (3, 23) which can be coupled into the optical fiber (6), wherein the portions of the light (3, 23) backscattered in the optical fiber (6) can be coupled out of the optical fiber (6) and evaluated. The apparatus further includes means for reducing polarization-induced effects, wherein the means may be, for example, a polarization modifier (4) capable of at least partially depolarizing the light (3).

Abstract: A method and system for determining a physical property as a function of position. A data series including data point from one or more channels is obtained by frequency modulation continuous wave. A number of data points correspond to Nda different values of frequency of modulation. One or more processing steps are performed including at least part of said primary data series to obtain at least one secondary data series comprising N (N>Nda) data points from the values of frequency of modulation. The secondary data series from frequency domain is transformed to obtain at least one back scattering curve in space domain, and optionally the back scattering curve(s) to one or more physical properties as a function of position.

Abstract: The object of the invention is to provide a method of calibrating an optical FMCW backscattering measurement system that improves the precision of the measurement. The problem is solved by a method comprising the steps of A. Converting said received sensor signal to a complex received electrical signal as a function of said modulation frequency fm, said complex received electrical signal being represented by a magnitude part and a phase angle part as a function of said modulation frequency fm; B. Performing a transformation of said received electrical signal to provide a backscattering signal as a function of location between said first and second ends of said sensor and beyond said second end; C. From said backscattering signal as a function of location determining characteristics of a curve representative of said backscattering signal beyond said second end; D.

Abstract: A device for calibrating a fiber-optic temperature measuring system has a broadband light source, a coupling-in device, which can couple light generated by the light source for calibration into an optical fiber of the temperature measuring system, a coupling-out device, which can couple components of the light source-generated light that are backscattered in the optical fiber out of the optical fiber. An evaluation device performs a calibration of the temperature measuring system on the basis of the backscattered components of the light.

Abstract: The object of the invention is to provide a method of calibrating an optical FMCW backscattering measurement system that improves the precision of the measurement. The problem is solved by a method comprising the steps of A. Converting said received sensor signal to a complex received electrical signal as a function of said modulation frequency fm, said complex received electrical signal being represented by a magnitude part and a phase angle part as a function of said modulation frequency fm; B. Performing a transformation of said received electrical signal to provide a backscattering signal as a function of location between said first and second ends of said sensor and beyond said second end; C. From said backscattering signal as a function of location determining characteristics of a curve representative of said backscattering signal beyond said second end; D.

Abstract: The invention relates to a method and system for determining a physical property for determining physical property as a function of position, where a data series is obtained by FMCW. The data series comprises data points from one or more channels and the method comprises measuring a number of data points corresponding to Nda different values of frequency of modulation, performing one or more processing step comprising at least part of said primary data series to obtain at least one secondary data series comprising N (N>Nda) data points for the values of frequency of modulation, performing a transformation of said secondary data series from frequency domain to obtain at least one back scattering curve in space domain and optionally said back scattering curve(s) to one or more physical properties as a function of position.

Abstract: With the proposed invention a method for configuring a measuring arrangement for physical, more particularly thermal conditions over a section to be measured is indicated, comprising at least one locally distributed sensor. The measuring arrangement consists of programmable modules with the minimum characteristics of acquire, edit, save, represent and signal measurement data of at least one distributed sensor. The method according to the invention consists in the fact that zone-specific data of the section to be measured are assigned to zone-specific measured quantities, and that these data are combined into data groups, and that the modules are configured with parameter sets with which editing steps of the individual modules are functionally assigned to one another. One parameter set preferably includes at least sensor-specific parameters; measuring instrument-specific parameters; organization of data and programs; organization of hardware modules; representation of the data and communication parameters.