High resolution molecular LIDAR
AssigneeNEOLund AB
InventorMikkel Brydegaard
Life of this patent
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Abstract
The present disclosure provides a Scheimpflug LIDAR apparatus for detecting a property of a gas comprising: a light source configured to emit a light along at least a first axis, a light detection arrangement, and an optical configuration fulfilling the Scheimpflug condition and Hinge rule. The light source comprises an expander aperture, and wherein the expander aperture and light detection arrangement are configured such that: a spot size of the emitted light along the first axis is matched to a pixel footprint of pixels configured to receive light from corresponding distances along the first axis, and an effective range resolution of at least one column of pixels or probe volume deteriorates linearly with respect to the range.
Claims9
A device for detecting a property of a gas comprising:
- a light source configured to emit a light along at least a first axis, and
- a light detection arrangement comprising:
- a lens arrangement having a lens plane, a displaced image plane, and a front focal plane, and being configured to direct the light from the light source and scattered by the gas to a light sensor, and
- the light sensor comprising at least one column of pixels aligned to an image plane and configured to output a sensor signal,
- wherein the first axis, the lens plane, and the image plane intersect such that a Scheimpflug condition is achieved,
- wherein the displaced image plane, the front focal plane of the lens arrangement, and a relationship between the light source and the light detection arrangement fulfil the Hinge rule intersection,
- wherein the light source comprises an expander aperture providing an effective range resolution of at least one column of pixels or a probe volume that deteriorates linearly with respect to range, and wherein the expander aperture and the lens arrangement are configured such that a spot size of the light emitted along the first axis is matched to a pixel footprint of pixels configured to receive light from corresponding distances along the first axis, and
- wherein dimensions of the light source are matched with respective focal lengths attributable to the pixels of the at least one column of pixels.
A method for detecting a property of a gas comprising:
- emitting a light from a light source along at least a first axis, and
- generating a sensor signal using a detection arrangement comprising:
- a lens arrangement having a lens plane, a displaced image plane, and a front focal plane, and being configured to direct the light from the light source and scattered by the gas to a light sensor, and
- the light sensor comprising at least one column of pixels aligned to an image plane and configured to output a sensor signal,
- wherein the first axis, the lens plane, and the image plane intersect such that a Scheimpflug condition is achieved,
- wherein the displaced image plane, the front focal plane of the lens arrangement, and a relationship between the light source and the detection arrangement fulfil the Hinge rule intersection,
- wherein the light source comprises an expander aperture providing an effective range resolution of at least one column of pixels or a probe volume that deteriorates linearly with respect to range, and wherein the expander aperture and the lens arrangement are configured such that a spot size of the light emitted along the first axis is matched to a pixel footprint of pixels configured to receive light from corresponding distances along the first axis, and
- wherein a dimension of the light source is matched with a respective focal length attributable to the pixels of the at least one column of pixels.
Dependencies are inferred from the claim text.