127results about "Time interval measurement" patented technology

Plural electronic or optical images are provided in a streak optical system, as for instance by use of plural slits instead of the conventional single slit, to obtain a third, fourth, etc. dimension—rather than only the conventional two, namely range or time and azimuth. Such additional dimension or dimensions are thereby incorporated into the optical information that is to be streaked and thereby time resolved. The added dimensions may take any of an extremely broad range of forms, including wave-length, polarization state, or one or more spatial dimensions—or indeed virtually any optical parameter that can be impressed upon a probe beam. Resulting capabilities remarkably include several new forms of lidar spectroscopy, fluorescence analysis, polarimetry, spectropolarimetry, and combinations of these, as well as a gigahertz wavefront sensor.

A method and system for calibrating a wireless sensor device are disclosed. In a first aspect, the method comprises determining a vertical calibration vector and determining a rotation matrix using the vertical calibration vector to line up native axes of the wireless sensor device with body axes. In a second aspect, a wireless sensor device comprises a processor and a memory device coupled to the processor, wherein the memory device includes an application that, when executed by the processor, causes the processor to determine a vertical calibration vector and to determine a rotation matrix using the vertical calibration vector to line up native axes of the wireless sensor device with body axes.

A combination probe is positioned at a location in a stationary portion of a turbo machine that defines a gas flow path and is configured to detect a moving portion of the turbo machine within the gas flow path. The combination probe includes a tip timing sensor configured to sense when the moving portion is located proximate to the location of the probe, and an optical component configured to have a field of view that includes the moving portion when the moving portion is located proximate to the location of the probe. There is also an image capture device coupled to the optical component to capture an image of the field of view. The image can be used to determine the particular blade tip location within the field of view which is also the blade tip location sensed by the tip timing sensor.

An apparatus (1) for activation of at least one element is disclosed. The apparatus (1) comprises at least one activation layer (20), at least one migration layer (40) arranged at the at least one activation layer (20) and being permeable to a fluid (70). The fluid (70) causes in use a change of doping level in the at least one activation layer (20) which activates the at least one element. The element may comprise an electrochromic display element (220), an electrical switch, a time controlled resistor, a galvanic element (210) or any combination thereof.

The present invention provides a timepiece wherein the passage of time is represented by the movement of a fluid column from within an inner tube to a space between the inner tube and a concentric outer tube. In one embodiment, the timepiece includes a display mechanism adapted to adjust a fluid column height based on a capacitance proportional to the fluid column height.

The structure and the relation of position in the device are as follows. The light source passing through the first beam splitter mirror is divided into the transmissive pump light and the reflected probe light. With passing through the pulse strecher and the first delay light path system, the pump light is reflected by the first holophote and through the first convergent lens to irradiate the specimen to be measured perpendicularly. With passing through the second and third holophote, the probe light is focused by the second convergent lens to the specimen. The first detector is positioned in the reflected light path of the probe light and the second detector in the transmission light path. The pulse width of the pump light is broadened by the stretcher to several, tens or hundreds timesof wide of the probe light pulse.

A method determines a transient response of a sample. The method includes providing a measured magnitude of the Fourier transform of a complex electric field temporal profile of a pulse sequence comprising a probe pulse and a dummy pulse, wherein the probe pulse is indicative of the transient response of the sample. The method further includes providing an estimated phase term of the Fourier transform of the complex electric field temporal profile of the pulse sequence. The method further includes multiplying the measured magnitude and the estimated phase term to generate an estimated Fourier transform of the complex electric field temporal profile of the pulse sequence. The method further includes calculating an inverse Fourier transform of the estimated Fourier transform, wherein the inverse Fourier transform is a function of time. The method further includes calculating an estimated complex electric field temporal profile of the pulse sequence by applying at least one constraint to the inverse Fourier transform.

A digital data transmitter includes a circuit board having at least a power circuit, a universal serial bus (USB) interface circuit, a central processing unit (CPU) and two connectors. The connectors are high-speed transmission USB connectors. To transmit digital data stored in a specific information product to another information product, the two information products are connected to the high-speed transmitter, thereby directly transmitting and storing data via the CPU without requiring computers as media as in conventional transmission means. Being free of restrictions of computer hosts, the digital data transmitter enables a user to quickly transmit and store digital data at all time.

An electrochemical display device capable of irreversibly switching from a first indicating state to a second indicating state comprises a substrate (12) having an electrically insulating surface (16), and a first electrode (30) located on at least a part of said surface (16) of said substrate (12), wherein said substrate (12), at least within said part of its surface (16) is light-transmissive, the transmissivity of the combination of said substrate (12) and said first electrode (30) being less than that of said part of said substrate (12). Furthermore, the electrochemical display device comprises a second electrode (32), and an electrolytic liquid (28) arranged between and in electrical contact with said first and second electrodes (30,32), wherein, upon application of an electrical voltage to said first and second electrodes (30,32), material of said first electrode (30) dissolves into said electrolytic liquid (28) exposing at least partially said substrate (12) thereby switching from the first indicating state to the second indicating state.

A method and system for calibrating a wireless sensor device are disclosed. In a first aspect, the method comprises determining a vertical calibration vector and determining a rotation matrix using the vertical calibration vector to line up native axes of the wireless sensor device with body axes. In a second aspect, a wireless sensor device comprises a processor and a memory device coupled to the processor, wherein the memory device includes an application that, when executed by the processor, causes the processor to determine a vertical calibration vector and to determine a rotation matrix using the vertical calibration vector to line up native axes of the wireless sensor device with body axes.

An optical heterodyne sampling device includes: two pulsed laser sources which may have a jitter and which can receive respectively a pump beam and a probe beam having respective repetition frequencies Fs and Fp, whereby Fs≠Fp; and an element for combining the pump beam and the probe beam which are intended to be passed over a sample, consisting of a signal channel including a system for the photodetection of the response signal from the sample and a system for acquiring the photodetected signal, which is connected to the signal channel. According to the invention, Fs and Fp are essentially constant and the acquisition system includes an acquisition trigger element. A synchronization channel is connected to the trigger element, and includes a device for measuring the beat frequency |Fs−Fp| which can generate a synchronization signal comprising pulses each time the pulses of the pump beam and the probe beam coincide.

A light pulse from an ultrashort pulse light source 11 is split by a beam splitter 12 and guided, to a detection medium 4, as an excitation pulse and probe pulse having respective predetermined linearly polarized states by an excitation optical system 2 and probe optical system 3, respectively. A light track region which is generated in the detection medium 4 by incidence of the excitation pulse, and in which the refractive index is changed by a nonlinear optical effect, is irradiated with the probe pulse. Of components which have passed through the detection medium 4, a probe pulse component whose polarized state has changed through the light track region is detected by a camera 53 via an analyzer 51 in a photodetection part 5. This realizes a light track observation apparatus capable of directly observing the light track of an excitation pulse.

The invention relates to a device for measuring the profile of single optical pulses, comprising:

means (1, F) for creating a series of replica pulses (Ri) of the initial optical pulse, starting from the initial optical pulse (I),

slaving means (2, 3, 4, AMP) for adjusting the amplitudes of replica pulses (Ri) to values substantially the same as each other,

sampling means (7, Ech) for forming optical samples (Ei) starting from replica pulses (Ri), and

detection means (D) for forming an electrical signal starting from the optical samples (Ei).

The invention is applicable to measurement of single optical or electrical pulses or pulses with a low repetition rate.

The invention discloses a pulsar photon timing method based on an APD detector. An APD is used for realizing detection on weak pulsar photons of 0.5keV to 10keV. On one hand, the pulsar photon timing method has the advantages of high detection efficiency, rapid response time, high energy resolution and the like; on the other hand, photon-generated carriers in the detector are drifted along a pn junction direction; time jitter caused by the detector is relatively small, so that the pulsar photon timing method is very suitable for pulsar photon timing; a constant-ratio timing and single threshold value triggering method is adopted, so that noises are inhibited, and furthermore, an amplitude movement effect caused by different X photon energy is eliminated; advantages that a GPS (Global Positioning System) second pulse signal is long and stable and an atomic clock is short and stable are combined, and long and stable and high-precision clock frequency is output through a correction principle; TDC (Time-Digital Convert) timing precision is kept; furthermore, pulsar photon timing errors are reduced.

The invention belongs to the field of ultrafast diagnosis, and particularly relates to a terahertz-driven sub-femtosecond time-resolved streak camera. The camera comprises a femtosecond laser device, a beam splitter, an ultraviolet laser pulse generation device, an electronic gun, a magnetic focusing device, a deflection system, a fluorescent screen and an EBCCD camera; after femtosecond laser emitted by the femtosecond laser device passes through the beam splitter, one femtosecond laser beam enters the ultraviolet laser pulse generation device, and the other femtosecond laser beam enters the deflection system; the electronic gun is used for converting ultraviolet laser pulses generated by the ultraviolet laser pulse generation device into electronic pulses and accelerating the electronic pulses; the magnetic focusing device is installed between the electronic gun and the deflection system; the EBCCD camera is installed at the position, directly facing the fluorescent screen, outside a main vacuum chamber. According to the streak camera, the time characteristics of the non-relativistic and relativistic ultrafast electronic pulses can be detected, and the resolution can reach the magnitude of a few femtoseconds.

The invention belongs to the field of time measurement, and particularly relates to a time interval measurement calibration device based on light path delay and a measurement calibration method of the device. The time interval measurement calibration device based on light path delay comprises a light source (1), a Y-type optical fiber (2), a first photoelectric detector (3), a second photoelectric detector (4), an emitting lens (5), a receiving lens (6), a light transmitting optical fiber (7), a time interval measurement system (8), a displacement measurement system (9), a moving platform (10) and a guide rail (11). The time interval measurement calibration device based on light path delay is simple in principle, compact in structure and convenient to trace for the source; time resolution of calibration is high, and uncertainty of the system is small; the device is convenient and flexible to operate, good in repeatability and high in stability.