Micro ring grating spectrometer with adjustable aperture
First Claim
1. A spectrometer comprising:
- a micro-ring grating device having a plurality of coaxially-aligned ring gratings, wherein the grating device is configured for diffracting a predetermined frequency band of incident light onto a target focal point;
a detection device operable for detecting a predetermined spectral characteristic;
at least one actuator; and
an adjustable aperture device defining a circular aperture circumscribing the target focal point, wherein the aperture device is operable for directing a selected portion of the predetermined frequency band to the detection device;
wherein the adjustable aperture device is selectively adjustable using the at least one actuator to thereby direct the selected portion of the predetermined frequency band to the detection device.
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Accused Products
Abstract
A spectrometer includes a micro-ring grating device having coaxially-aligned ring gratings for diffracting incident light onto a target focal point, a detection device for detecting light intensity, one or more actuators, and an adjustable aperture device defining a circular aperture. The aperture circumscribes a target focal point, and directs a light to the detection device. The aperture device is selectively adjustable using the actuators to select a portion of a frequency band for transmission to the detection device. A method of detecting intensity of a selected band of incident light includes directing incident light onto coaxially-aligned ring gratings of a micro-ring grating device, and diffracting the selected band onto a target focal point using the ring gratings. The method includes using an actuator to adjust an aperture device and pass a selected portion of the frequency band to a detection device for measuring the intensity of the selected portion.
41 Citations
17 Claims
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1. A spectrometer comprising:
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a micro-ring grating device having a plurality of coaxially-aligned ring gratings, wherein the grating device is configured for diffracting a predetermined frequency band of incident light onto a target focal point; a detection device operable for detecting a predetermined spectral characteristic; at least one actuator; and an adjustable aperture device defining a circular aperture circumscribing the target focal point, wherein the aperture device is operable for directing a selected portion of the predetermined frequency band to the detection device; wherein the adjustable aperture device is selectively adjustable using the at least one actuator to thereby direct the selected portion of the predetermined frequency band to the detection device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A spectrometer comprising:
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a micro-ring grating device having a plurality of coaxially-aligned ring gratings, wherein the ring gratings are configured for directing a predetermined frequency band of incident light onto a target focal point; an adjustable aperture device defining a circular aperture circumscribing the target focal point; a detection device adapted for detecting the intensity of a selected portion of the predetermined frequency band, and for converting the detected intensity into a corresponding proportional electrical signal; a linear actuator connected to the aperture device, wherein the linear actuator is configured for selectively changing the distance between the aperture device and the grating device to thereby modify the focal length of the spectrometer; and a Micro-Electro-Mechanical System (MEMS) device connected to the aperture device and configured for changing the diameter of the circular aperture. - View Dependent Claims (9, 10, 11, 12)
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13. A method of detecting the intensity of a selected frequency band of incident light, the method comprising:
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directing the incident light onto a plurality of coaxially-aligned ring gratings of a micro-ring grating device; diffracting a predetermined frequency band of the incident light onto a target focal point using the ring gratings; using at least one actuator to selectively adjust an adjustable aperture device to thereby pass a selected portion of the frequency band to a detection device; detecting the intensity of the selected portion using the detection device. - View Dependent Claims (14, 15, 16, 17)
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Specification