公开(公告)号：US10107744B2

公开(公告)日：2018-10-23

申请号：US15319313

申请日：2015-06-16

申请人： University of Virginia Patent Foundation ,  BrightSpec, Inc.

发明人： Brooks Hart Pate ,  Amanda Steber ,  Brent Harris

IPC分类号： G01N21/35 ,  G01N21/3586

摘要： Apparatus and techniques for broadband Fourier transform spectroscopy can include frequency hopping spread-spectrum spectroscopy approaches. For example, an excitation source power can be spread over a specified frequency bandwidth, such as by applying a sequence of short, transform-limited pulses to a sample. Each pulse can include a specified carrier frequency, and a corresponding bandwidth of the individual pulse can be determined by a frequency domain representation when Fourier transformed. A series of short excitation pulses can be used to create an excitation sequence, such as to deliver a specified or desired amount of power to the sample, such as by having the excitation source enabled for a time comparable to a free induction decay (FID) dephasing time.

公开(公告)号：US09921170B2

公开(公告)日：2018-03-20

申请号：US14898077

申请日：2014-06-12

申请人： University of Virginia Patent Foundation

发明人： Brooks Hart Pate ,  Amanda Steber ,  Brent Harris ,  Kevin K. Lehmann

IPC分类号： G01J5/02 ,  G01N22/00 ,  G01J3/453 ,  G01N21/3586

CPC分类号： G01N22/00 ,  G01J3/453 ,  G01N21/3586

摘要： Examples herein include apparatus and techniques that can be used to perform rotational spectroscopy on gas-phase samples. Such techniques can include using a spectrometer providing frequency synthesis and pulse modulation to provide excitation (e.g., pump or probe pulses) of a gas-phase sample at mm-wave frequencies. Synthesis of such mm-wave frequencies can include use of a frequency multiplier, such as an active multiplier chain (AMC). A free induction decay (FID) elicited by the excitation or other time-domain information can be obtained from the sample, such as down-converted and digitized. A frequency domain representation of the digitized information, such as a Fourier transformed representation, can be used to provide a rotational spectrum.

公开(公告)号：US11029261B2

公开(公告)日：2021-06-08

申请号：US16807270

申请日：2020-03-03

申请人： BrightSpec, Inc.

发明人： Justin L. Neill ,  Brent Harris ,  Brooks Hart Pate

IPC分类号： G01N22/00 ,  G01J3/44 ,  G01J3/42 ,  G01J3/45 ,  G01N21/63 ,  G01N21/35 ,  G01J3/453 ,  G01N21/3581

摘要： Methods and apparatuses for direct multiplication Fourier transform millimeter wave spectroscopy are disclosed herein. A sample method includes generating at least one pulse of microwave electromagnetic energy. The sample method also includes frequency-multiplying the pulse(s) to generate at least one frequency-multiplied pulse and filtering at least one spurious harmonic of the frequency-multiplied pulse to generate at least one filtered pulse. The spurious harmonic is generated by frequency-multiplying the pulse. The method also includes exciting a sample using the filtered pulse. The method further includes detecting an emission from the sample. The emission is elicited at least in part by the filtered pulse.