-
公开(公告)号：US11336290B2
公开(公告)日：2022-05-17
申请号：US16833731
申请日：2020-03-30
Applicant: Thermo Finnigan LLC
Inventor： Johnathan W. Smith , Scott T. Quarmby , Dustin J. Kreft , Michael W. Senko
Abstract: Control of an amplitude of a signal applied to rods of a quadrupole is described. In one aspect, a mass spectrometer includes an amplifier circuit that causes a radio frequency (RF) signal to be applied to the rods of the quadrupole based on an amplifier RF input signal. An analog-to-digital converter (ADC) can generate a digital representation of the RF signal. A controller circuit can receive the digital representation and adjust an amplitude of the amplifier RF input signal based on differences between an amplitude of a fundamental frequency of the RF signal being different than an expected amplitude.
-
公开(公告)号：US20220146312A1
公开(公告)日：2022-05-12
申请号：US17518874
申请日：2021-11-04
Applicant: IRsweep AG
Inventor： Stéphane SCHILT , Pierre BROCHARD , Kenichi KOMAGATA , Giulio TERRASANTA , Andreas HUGI
IPC: G01J3/433
Abstract: A dual-comb spectrometer comprising two lasers outputting respective frequency combs having a frequency offset between their intermode beat frequencies. One laser acts as a master and the other as a follower. Although the master laser is driven nominally with a DC drive signal, the current on its drive input line nevertheless oscillates with an AC component that follows the beating of the intermode comb lines lasing in the driven master laser. This effect is exploited by tapping off this AC component and mixing it with a reference frequency to provide the required frequency offset, the mixed signal then being supplied to the follower laser as the AC component of its drive signal. The respective frequency combs in the optical domain are thus phase-locked relative to each other in one degree of freedom, so that the electrical signals obtained by multi-heterodyning the two optical signals are frequency stabilized.
-
公开(公告)号：US20220136900A1
公开(公告)日：2022-05-05
申请号：US17435052
申请日：2020-03-02
Applicant: Spec-Imaging AB
Inventor： Edouard Jean Jacques BERROCAL , William René Serge CHAZE , Elias Viktor KRISTENSSON , Jérémie Thouakesseh ZOUEU
Abstract: An assembly for measurements of one or more optical parameters of a medium is disclosed. The assembly comprises a light sheet generator, a light intensity modulator, a holder for a sample, and an optical sensor.
The light sheet generator is configured to provide a polychromatic light sheet comprising a light spectrum extending in a first spatial dimension, wherein the polychromatic light sheet has a propagation path in a second spatial dimension.
The light sheet generator comprises a light source configured to provide white light, a dispersive element configured to spread the white light in the first spatial dimension to provide the light spectrum, and an optical slit extending in the first spatial dimension configured to provide the polychromatic light sheet by limitation of the spread white light.
The light intensity modulator is configured to provide an intensity modulated polychromatic light sheet by applying—to the polychromatic light sheet—an intensity modulation having a periodical (or substantially periodical) pattern in the first spatial dimension.
The holder for a sample of the medium is configured to enable the intensity modulated polychromatic light sheet to illuminate the sample.
The optical sensor is configured to record intensity of light exiting the sample over the light spectrum for provision of the one or more optical parameters.
A method of using the assembly for measuring one or more optical parameters of a medium is also disclosed.-
公开(公告)号：US11307092B2
公开(公告)日：2022-04-19
申请号：US16853811
申请日：2020-04-21
Applicant: Massachusetts Institute of Technology
Inventor： Amir H. Atabaki , Rajeev J. Ram , William F. Herrington
IPC: G01J3/44 , G01J3/02 , G01J3/10 , G01J3/28 , G01J3/18 , G01N21/65 , G01J1/42 , G01J3/433 , G02B6/293
Abstract: In swept source Raman (SSR) spectroscopy, a swept laser beam illuminates a sample, which inelastically scatters some of the incident light. This inelastically scattered light is shifted in wavelength by an amount called the Raman shift. The Raman-shifted light can be measured with a fixed spectrally selective filter and a detector. The Raman spectrum can be obtained by sweeping the wavelength of the excitation source and, therefore, the Raman shift. The resolution of the Raman spectrum is determined by the filter bandwidth and the frequency resolution of the swept source. An SSR spectrometer can be smaller, more sensitive, and less expensive than a conventional Raman spectrometer because it uses a tunable laser and a fixed filter instead of free-space propagation for spectral separation. Its sensitivity depends on the size of the collection optics. And it can use a nonlinearly swept laser beam thanks to a wavemeter that measures the beam's absolute wavelength during Raman spectrum acquisition.
-
公开(公告)号：US20220018759A1
公开(公告)日：2022-01-20
申请号：US17377096
申请日：2021-07-15
Inventor： Yamuna PHAL , Kevin Lee YEH , Rohit BHARGAVA
Abstract: Methods and apparatus for obtaining a vibrational circular dichroism (VCD) image using a discrete frequency infrared (DFIR) microscope are disclosed. The method includes generating a pulsed laser beam comprising a spectral frequency, which may be tunable; modulating the laser beam to generate circularly polarized light; illuminating a sample and collecting, and detecting an optical signal transmitted or transflected from the location of the sample. The detected signal is demodulated at, for example, both the pulse frequency and the sum or difference of the pulse frequency and the modulating frequency to obtain an intensity value that correspond to the absorbance, and a polarization-dependent value that corresponds to the VCD. Other configurations of the apparatus may be employed to measure VCB and VLD.
-
Patent Agency Ranking
公开(公告)号：US11193826B2
公开(公告)日：2021-12-07
申请号：US16293184
申请日：2019-03-05
Applicant: Rocco DiFoggio , Bernardo E. Pohl
Inventor： Rocco DiFoggio , Bernardo E. Pohl
Abstract: A method for performing a formation fluid test in a borehole penetrating a subsurface formation includes disposing a fluid tester in the borehole, extracting a sample of fluid from the subsurface formation using the fluid tester, and analyzing the sample using the fluid tester to provide test data for a process used to analyze the sample. The method also includes fitting an equation to the test data and calculating a ratio of a first derivative of the equation to a second derivative of the equation. The method further includes continuing to extract the sample from the subsurface formation in response to the ratio indicating a clean sample will be forthcoming and terminating the extracting of the sample from the subsurface formation in response to the ratio indicating a clean sample will not be forthcoming.
-
197.发明授权公开(公告)号：US11131625B2
公开(公告)日：2021-09-28
申请号：US16772763
申请日：2018-12-17
Applicant: NEO Monitors AS
Inventor： Viacheslav Avetisov
IPC: G01J5/02 , G01N21/3504 , G01J3/433 , G01N21/39
Abstract: Gas sensor capable for in-situ non-contact optical measurements of hydrogen gas (H2) and method for measuring hydrogen gas under ambient and elevated pressures without the need for cells with extremely long optical path length. The gas sensor can be configured for dual gas measurements such as H2 and CO2.
-
公开(公告)号：US11099069B2
公开(公告)日：2021-08-24
申请号：US16870282
申请日：2020-05-08
Applicant: NOVATRANS GROUP SA
Inventor： John F. Roulston , Daniel Mandelik
IPC: G01J3/10 , G01J3/433 , G01N21/3581 , G01J3/42
Abstract: A terahertz spectrometer includes: a terahertz-wave emitter and a terahertz receiver elements. The terahertz wave generated by means of generating beat frequency corresponding to the difference between two rapidly tunable continuous wave lasers. Having a difference in time between the interrogating signal and the reference signal at the receiver end side, which corresponds to intermediate frequency (IF), not centered around the baseband, i.e. zero Hertz. The offset step size of the intermediate frequency from zero Hertz is linearly correlated to the position of the interrogated object position.
-
公开(公告)号：US10935489B2
公开(公告)日：2021-03-02
申请号：US16150948
申请日：2018-10-03
Applicant: HORIBA, Ltd.
Inventor： Kyoji Shibuya , Kensuke Fukushiro , Toshio Ohta , Katsumi Nishimura
IPC: G01N21/39 , G01N21/3504 , G01J3/10 , G01J3/433 , G01J1/42
Abstract: The present invention relates to an analysis apparatus adapted to analyze a measurement target component contained in a sample by irradiating a measurement cell into which the sample is introduced with pulse-oscillated light, whereby suppressing reduction in wavelength resolution without shortening the pulse width. The analysis apparatus includes multiple light sources adapted to produce pulse oscillations, a light detector adapted to detect light emitted from the light source and transmitted through the measurement cell, and a signal separation part adapted to separate, from a light intensity signal obtained by the light detector, signals corresponding to a part of pulses from the light sources.
-
200.发明申请公开(公告)号：US20210041296A1
公开(公告)日：2021-02-11
申请号：US17044486
申请日：2019-04-01
Applicant: The Regents of the University of California
Inventor： Mona Jarrahi , Ning Wang
Abstract: A system for detecting high-frequency radiation that offers near-quantum-limited sensitivity, broad spectral bandwidth, and high spectral resolution while operating at room temperature. The system can include an antenna assembly configured to receive at least a high-frequency radiation and a substrate comprising a semiconductor material with a contact-semiconductor interface connected to the antenna assembly. The system also includes an optical pump configured to produce an optical beam that has a high-frequency beat frequency, the optical beam contacting the contact-semiconductor interface to create an intermediate frequency signal by combining the optical beam with the high-frequency radiation. The system further includes a detector configured to detect the intermediate frequency and generate at least one report indicating the received, high-frequency radiation.
-
-
-
-
-
-
-
-
-
Search Results
468
records
(took 0.025 seconds)
