OPTICAL PROBE, APPARATUS AND SYSTEM

• US 20140060619A1
• Filed: 10/11/2011
• Published: 03/06/2014
• Est. Priority Date: 10/11/2010
• Status: Abandoned Application

• Current Assignee: Sensor Coating Systems Limited
• Original Assignee: Sensor Coating Systems Limited
• Inventors: Feist, Joerg Peter, Zhang, Sijiong
• Application Number:
  US13/878,882
• Publication Number:
  US 20140060619A1
• Time in Patent Office: Days
• US Class Current: 136/246
• CPC Class Codes: F24S 23/00 Arrangements for concentrating solar-rays for solar heat collectors
• CPC Class Codes: F24S 50/20 for tracking
• CPC Class Codes: G01N 21/6408 with measurement of decay time, time resolved fluorescence
• CPC Class Codes: G01N 21/645 Specially adapted constructive features of fluorimeters
• CPC Class Codes: G01S 3/7861 Solar tracking systems
• CPC Class Codes: G02B 19/0014 at least one surface having optical power
• CPC Class Codes: G02B 19/0042 for use with direct solar radiation
• CPC Class Codes: G02B 23/2446 of the image relay G02B23/26 takes precedence
• CPC Class Codes: G02B 23/2484 Arrangements in relation to a camera or imaging device processing or control of video signals generated by an endoscope H04N23/60, H04N23/70
• CPC Class Codes: G02B 27/10 Beam splitting or combining systems polarising systems G02B27/28; mixing and splitting light signals using optical waveguides G02B6/28; beam shaping, e.g. changing the cross-sectional area, by dividing or superposing multiple light beams G02B27/0905
• CPC Class Codes: G02B 3/08 with discontinuous faces, e.g. Fresnel lens diffractive Fresnel lenses G02B5/1876
• CPC Class Codes: H01L 31/0543 comprising light concentrating means of the refractive type, e.g. lenses
• CPC Class Codes: Y02E 10/47 Mountings or tracking
• CPC Class Codes: Y02E 10/52 PV systems with concentrators

Abstract

An optical system (3) for transferring light energy from a light source (1), in particular a moving light source, to a common aperture independent of the location of the light source within a field of view, wherein the light energy distribution is preferably substantially uniform over the area of the common aperture. A detection system comprises a light source 1 for irradiating a spot on a moving object 0, an optical probe assembly 3 for collecting light energy from the irradiated spot on the subject 0 when within a field of view of the probe assembly 3, and a photodetector 4.

Claims

1. An optical system for transferring light energy from a light source, in particular a moving light source, to a common aperture independent of the location of the light source within a field of view, wherein the light energy distribution is preferably substantially uniform over the area of the common aperture.

2. The optical system of claim 1, having a field of view of at least about 5°

, 8°

, 10°

or 12°

over which substantially 100% of the light energy passes through the common aperture.

6. The optical system of claim 1, wherein the optical system allows for detection of light intensity at the common aperture without any de-convolution of the detected light.

7. The optical system of claim 1, comprising a first optical element for focussing incident radiation from the object to a focal point, and a second optical element for relaying the image of the first optical element to the common aperture independent of the location of the light source when within the field of view, optionally the first optical element comprises a single lens, optionally the second optical element comprises a single lens or a plurality of lenses, optionally the lenses are formed as Fresnel lenses.

12. The optical system of claim 7, further comprising a wedge prism located forward of the first optical element, optionally further comprising a drive mechanism which rotates the wedge prism to follow the light source or the wedge prism has a fixed position which provides for the field of view to have a predetermined inclination relative to an optical axis of the optical system.

15. The optical system of claim 1, wherein the common aperture comprises a circular, square or polygonal aperture and/or further comprising one or more filters for suppressing the transfer of unwanted light.

16. The optical system of claim 1, wherein the common aperture is at other than a focal or image plane.

17. The optical system of claim 1, wherein the rays are diverging at the common aperture.

21. A probe assembly, comprising:

a probe comprising the optical system of claim 1; and

a light collector for collecting light energy transferred by the probe, optionally the collector comprises a bundle of optical fibres.

23. The probe assembly of claim 21, further comprising:

a camera unit for enabling visual inspection of the object along an optical axis of the probe, optionally the camera unit comprises a camera for imaging the object, and an optical coupler which is operable optically to couple the camera to the probe to capture an image along the optical axis of the probe.

24. The probe assembly of claim 23, wherein the camera unit comprises a camera for imaging the object, and an optical coupler which is operable optically to couple the camera to the probe to capture an image along the optical axis of the probe, optionally (i) the coupler is moveable between an operative position in which the coupler optically couples the camera to the probe to capture an image along the optical axis of the probe and an inoperative position, and the camera unit further comprises an actuator which is actuatable to move the optical coupler between the operative and inoperative positions, optionally the coupler comprises first and second prisms which are arranged such that the camera is optically coupled to the optical axis of the probe when in the operative position, and the coupler is withdrawn from the optical path of the probe in the inoperative position, or (ii) the coupler comprises a dichroic element which is located on the optical axis of the probe and diverts light from the visible spectrum to the camera.

28. A detection system, comprising:

a light source for irradiating a spot on a moving object;

the probe assembly of claim 21 for collecting light energy from the irradiated spot on the object when within a field of view of the probe; and

a photodetector for measuring the intensity of the light energy collected by the probe;

optionally the light source is configured to provide a collimated light beam for a predetermined period to irradiate a spot on the object at an upstream end of the field of view of the probe, and, during movement of the object across the field of view of the probe, the light energy from luminescence generated by the irradiated spot on the object is collected by the probe and detected by the photodetector.

30. A photovoltaic module comprising the optical system of claim 1, and a photovoltaic cell located at the common aperture of the optical system, optionally the optical system provides for a relative intensity of at least about 50%, at least about 60%, at least about 70% or at least about 75% at an angle of incidence of about 30°

.

35. A photovoltaic array comprising a plurality of the photovoltaic modules of claim 30.

43. A photovoltaic system, comprising:

the photovoltaic module or array of claim 30; and

a tracking mechanism for moving the photovoltaic module or array to follow the path of the sun.

44. The photovoltaic system of claim 43, wherein the tracking mechanism is operative to move the photovoltaic module or array between a plurality of fixed positions over a period of one day, optionally the tracking mechanism is operative to move the photovoltaic module or array between not more than 10 positions, not more than 8 positions or not more than 5 positions over a period of one day.

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36. A photovoltaic array, comprising:

a plurality of optical systems for transferring light energy from a light source, in particular a moving light source, to common apertures independent of the location of the light source within a field of view, wherein each optical system comprises a first optical element for focussing incident radiation from the light source to a focal point, and a second optical element for relaying the image of the first optical element to the common aperture independent of the location of the light source when within the field of view; and

a plurality of photovoltaic cells located respectively at the common apertures of the optical systems.

37. The photovoltaic array of claim 36, wherein the optical elements are fabricated as Fresnel lenses in separate sheets located above the photovoltaic cells.

38. The photovoltaic array of claim 36, wherein the first optical element comprises a single lens and/or the second optical element comprises a single lens or a plurality of lenses.

41. The photovoltaic array of claim 36, wherein each optical system further comprises a wedge prism located forward of the first optical element, optionally the wedge prism has a fixed position which provides for the field of view to have a predetermined inclination relative to an optical axis of the optical system.

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