30 results about "Photon correlation" patented technology

The invention provides a method for measuring oscillation frequency. The method comprises: the change of scattered light is transmitted to a photomuitplier specially used for photon counting through optical fiber when objects vibrate, the photomuitplier transforms optical signals into electrical signals, and then the electrical signals are transmitted to a photoelectric pulse counter; data output by the photoelectric pulse counter is transmitted to a data processing computer, and the data processing computer utilizes a photon correlation method to process the data; after that, the data is transformed by Fourier, so that power spectrum image and data of oscillation frequency distribution can be obtained.

An optical system and method for characterizing an object is provided. The system includes at least one light source configured to direct photons toward an object and an interferometer configured to receive photons from the object. The system also includes at least one detector system adapted to detect an optical signal at an output of the interferometer and to remove, from the detected optical signal, a signal portion representing first order photon correlations, when present. The system also includes a processor configured to receive data relating to second-order correlated photons from said at least one detector system, each photon or photon pair subject to at least two indistinguishable paths to a photon or photon pair, but differing in at least one of time and length. The processor is configured to characterize the object based on a self interference of the second-order correlated photons from a common location within the object.

A heat-sensitive negative-working lithographic printing plate precursor includes a support having a hydrophilic surface or which is provided with a hydrophilic layer and a coating provided thereon, the coating including an image-recording layer which includes hydrophobic thermoplastic polymer particles, a binder, and an infrared absorbing dye; wherein the hydrophobic thermoplastic polymer particles have an average particle diameter, measured by Photon Correlation Spectroscopy, of more than 10 nm and less than 40 nm; the amount of the IR-dye, without taking into account an optional counter ion, is more than 0.80 mg per m2 of the total surface of the thermoplastic polymer particles, measured by Hydrodynamic Fractionation; and the amount of hydrophobic thermoplastic polymer particles relative to the total weight of the ingredients of the imaging layer is at least 60%.

The invention relates to the technical field of granularity measurement of a photon correlation spectroscopy and particularly relates to a photon correlator. The high-speed photon correlator with a large dynamic range comprises a photon correlator; the photon correlator comprises channels and the channels comprise a high-speed channel and a low-speed channel; the high-speed photon correlator further comprises an FPGA (Field Programmable Gate Array) chip circuit, a DSP (Digital Signal Processor) chip circuit and a computer; and the DSP chip circuit is respectively connected with the FPGA chip circuit and the computer. The FPGA chip circuit is used for computing the high-speed channel and the DSP chip circuit is used for computing the low-speed channel. According to the high-speed photon correlator with the large dynamic range disclosed by the invention, based on the structure combining the high-speed channel and the low-speed channel, fewer hardware resources are utilized, so that a dynamic range of the correlator is improved and the high-speed correlation computation is realized; and meanwhile, the cost of the correlator is reduced.

A method for making a lithographic printing plate includes the steps of (i) providing a lithographic printing plate precursor including a coating, the coating including an image-recording layer which includes hydrophobic thermoplastic polymer particles, a binder, and an infrared absorbing dye, wherein the hydrophobic thermoplastic polymer particles have an average particle diameter, measured by Photon Correlation Spectroscopy, of more than 10 nm and less than 40 nm, and the amount of the IR-dye, without taking into account an optional counter ion, is more than 0.70 mg per m2 of the total surface of the thermoplastic polymer particles, measured by Hydrodynamic Fractionation, and the amount of hydrophobic thermoplastic polymer particles relative to the total weight of the ingredients of the imaging layer is at least 60%; (ii) exposing the precursor to infrared light; and (iii) developing the exposed precursor in an alkaline aqueous solution.

The invention relates to a microwave photon correlation imaging system based on microwave far-field local optical reconstruction, and belongs to the technical field of photoelectric imaging. In microwave radar correlation imaging, it is necessary to accurately know the distribution of the random detection radiation field in the target area, and this radiation field distribution cannot be directly detected in real time. The current microwave radar correlation imaging technology mainly obtains the random detection radiation field distribution by calculation according to the system configuration and the parameters of the transmitted signal. There is a deviation in the waveform, and the calculation of the actual radiation field distribution is difficult, which is not conducive to stable and accurate imaging. Therefore, there are great challenges in the practical application of microwave radar correlation imaging. The invention realizes microwave radar correlation imaging based on the local optical reconstruction of the measured random detection radiation field distribution, and fundamentally avoids the above-mentioned problem of estimation deviation.

The present application provides a method and device for managing coincidence counts. The method includes: receiving a coincidence counting instruction instruction, and analyzing the coincidence counting instruction instruction, to obtain a plurality of counting combinations and channel data of each counting combination; and judging whether there is an existence between each counting combination according to the obtained channel data of each counting combination Combining inclusion relationships, and dividing multiple counting combinations with combined inclusion relationships into the same counting strategy; obtaining the photon generation time data of each optical channel corresponding to each counting strategy, and recording them within the time period corresponding to the preset counting duration , controlling the thread corresponding to the counting strategy to perform coincidence counting on each optical channel corresponding to the counting strategy based on the preset time window width and the corresponding photon generation time data. The method can save the computing resources of the system, improve the coincidence counting efficiency between different optical channel combinations, relieve the limitation on the number of optical channels by the equipment, and improve the scheme design flexibility of the photon correlation experiment.

The invention discloses a device for measuring the non-uniform broadening of the uppermost energy level in the cascade radiation process. The device comprises: a Franson type interferometer system and a feedback control system; photon pairs emitted by the cascade radiation process pass through the Franson type interferometer , to detect their two-photon correlation signals, so as to obtain the interference fringes of the Franson interferometer system, by changing the arm length difference of the Franson type interferometer system, read the size of the fanson interference visibility in various cases, so as to obtain the highest energy level non-uniformity In the case of widening; the feedback control system is used to calculate the change of the phase difference of the Franson type interferometer system, so as to maintain the relative stability of the Franson type interferometer system. By adopting the device disclosed by the invention, the non-uniform broadening of the uppermost energy level of cascade radiation can be directly measured, thereby expanding the scope of energy level research.

The invention relates to a topical nanoparticulate spironolactone formulation comprising nanoparticles having a mean diameter, measured by photon correlation spectroscopy, in the range of from about 300nm to about 900nm. The nanoparticles are incorporated into a crystalline network system comprising a dispersion of solid crystals of polar lipids, said lipids exposing their hydrophilic side outwards and their hydrophobic side inwards towards the spironolactone nanoparticles.

A time of flight camera includes a light source, a first pixel, a time-to-digital converting, and a controller. The light source is configured to emit light towards an object to be reflected back to the time of flight camera as image light. The first pixel includes a photodetector to detect the image light and to convert the image light into an electric signal. The time-to-digital converter is configured to generate timing signals representative of when the light source emits the light and when the photodetector detects the image light. The controller is coupled to the light source, the first pixel, and the time-to-digital converter. The controller includes logic that when executed causes the time of flight camera to perform operations. The operations include determining a detection window for a round-trip time of the image light based, at least in part, on the timing signals and first pulses of the light. The operations also include determining the round-trip time based, at least in part, on the timing signals and second pulses of the light detected within the detection window.

The invention relates to a photon correlator based on a field programmable gate array (FPGA), which is used for obtaining scattered light signal autocorrelation function in photon-correlation spectroscopy granulometry technology and is mainly composed of a synchronous reset module, a photon counting module, a correlation algorithm module and a computer interface module, wherein the photon counting module carries out the evenly spaced counting for photon signal period of a photon detector and sends the result to the photon correlation algorithm module to obtain a correlation function; the computer interface module sends the result to the computer. The invention realizes the high-speed photon correlator based on the field programmable gate array (FPGA) and expands the number of channels of the correlator and dynamic range time in a multi-disc FPGA cascading mode.