Terahertz frequency domain spectrometer with discrete coarse and fine tuning
First Claim
1. A method for spectroscopy comprising:
- sweeping a CW radiative beam over at least one frequency band in a range of frequencies greater than 100 GHz;
receiving the CW radiative beam with a frequency control element and finely adjusting the frequency of the CW radiative beam using the frequency control element in frequency increments less than 100 MHz for generating electrical signals representative of some characteristic of a target in the at least one frequency band;
directing the finely adjusted radiative beam to a target; and
acquiring spectral information from the target.
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Accused Products
Abstract
An apparatus for analyzing, identifying or imaging an target including first and second laser beams coupled to a pair of photoconductive switches to produce CW signals in one or more bands in a range of frequencies greater than 100 GHz focused on and transmitted through or reflected from the target; and a detector for acquiring spectral information from signals received from the target and using a multi-spectral heterodyne process to generate an electrical signal representative of some characteristics of the target. The lasers are tuned to different frequencies and a frequency shifter in the path of one laser beam allows the terahertz beam to be finely adjusted in one or more selected frequency bands.
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Citations
14 Claims
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1. A method for spectroscopy comprising:
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sweeping a CW radiative beam over at least one frequency band in a range of frequencies greater than 100 GHz; receiving the CW radiative beam with a frequency control element and finely adjusting the frequency of the CW radiative beam using the frequency control element in frequency increments less than 100 MHz for generating electrical signals representative of some characteristic of a target in the at least one frequency band; directing the finely adjusted radiative beam to a target; and acquiring spectral information from the target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification