DE19805482C2 - Device for holding the entry surface of an optical fiber in the focal plane of an objective - Google Patents

Abstract

The light guide eyepiece simplifies the coupling of light from the beam path of a lens into an optical fiber. The light source can be viewed through the lens at the same time and the light is focused on the tip of the light guide. DOLLAR A The tip of an optical fiber is attached to the focal plane of an eyepiece lens. The optical fiber leads out of the side of the eyepiece. See Fig. 2. The eyepiece is inserted into a microscope or telescope. You look through the eyepiece, focus the light source and adjust the part of the image to be examined on the optical fiber. All light from the part of the light source that is hidden by the small point of the fiber in the field of view of the eyepiece is guided through the optical fiber from the eyepiece housing to the measuring device. DOLLAR A The light guide eyepiece is particularly well suited for use on spectrographs or photometers that are used on microscopes, telescopes or other objectives.

Description

The invention relates to a device according to the preamble of the saying 1.

Should the light from a star or other distant light source be spectro be examined scopically, it must be collected using telescope optics and be directed into the spectrograph.

In the spectroscopy of stars, the telescope optics of the apparent Movement of the stars can be tracked during the day.

State of the art

To the image or light from an objective lens into a recording device to conduct, are bundled or individual optical fibers used.

One end of the light guide is in the focal plane of the objective lens or in brought their proximity and that emerges from the other end of the light guide led light into a lens system, cf. the publication US 4676 592.

Disadvantages of the prior art

Around the star disc shown in the focus of the telescope optics on the one Positioning the tread of the very thin light guide is a second telephoto scope optics necessary. This must be installed parallel to the first one.

The second telescope optics is provided with a crosshair eyepiece.

Then the two optics must be adjusted to each other so that the Spectroscopic star in the one telescope in the middle of the reticle zoculares and at the same time in the other telescope on the entrance surface of the Optical fiber is mapped.

This is very difficult to do. In addition, the adjustment of the two telescopes to each other when tracking the star over time deteriorate.

In addition, a very stable mount (tripod) of the telescopes is necessary, since both are tracked together by the apparent movement of the stars have to.

Another problem is the focusing of the star disc on the on tread surface of the light guide.

So far, focusing can be done by changing the focus setting and following intensity measurement of that emerging at the other end of the light guide  Light done: The correct focus is achieved when the intensity is greatest.

Object of the invention

The object of the invention is to provide a simple device for adjusting the Star disc or other object on the entrance surface of the To create optical fiber.

This object is achieved by a device with the features of the claim 1 solved.

This device is called the light guide eyepiece in the following.

The holder of the telescopic entry surface of the light guide in the bren next to an eyepiece lens simplifies the adjustment of the spectroscopy the object very much.

If you look through the okluar, you can see the tip of the light guide in the cross cut.

The eyepiece can be used with any lens. Focusing the Sterns or other object in the eyepiece is done as usual.

Then you see the star or the object and the end of the light guide sharp at the same time. You move the lens so that the star or the object disappears behind the end of the light guide for the observer. So it hits light onto the entry surface of the light guide, which is in the focus of the ob jective lens located.

For the necessary control of the telescope tracking on the day apparently moving star no further telescope optics are necessary, because you can position the image of the star through the light guide eyepiece or visually inspect the object on the entry surface of the light guide.

The telescope mount can be easier, since it tra only one telescope must.

A spectrograph equipped with the light guide eyepiece can be used on everyone any lens can be used without the optical fiber eyepiece or the lens must be modified (provided the eyepiece fits in the Focuser of the lens).

By choosing different eyepiece lens focal lengths and light guides diameter can increase the magnification of the lens for a given lens Eyepiece and the apparent diameter of the light guide compared to that observed star or other object can be determined.  

embodiments

Exemplary embodiments of the invention are shown in the drawings 1 and 2 are shown and are described in more detail below.

Show it:

Fig. 1 is a view of the optical path from the lens, light guide and eyepiece with:

• a) objective lens,
• b) ocular lens,
• c) an observer,
• d) optical fiber and
• e) Focus

2 shows a longitudinal section through the Lichtleiterokular with.:

• a) eyepiece,
• b) focal plane,
• c) optical fiber,
• d) direction to the spectrograph,
• e) direction to the objective lens and
• f) optical axis

The end of the optical fiber ( Fig. 2, c) is in the focal plane ( Fig. 2, b) of the Lin se or the lens system of the eyepiece ( Fig. 2, a) attached so that the entrance surface of the optical fiber from the lens of Eyepiece pointing away.

The entrance surface of the light guide is perpendicular to the optical axis ( Fig. 2, f) of the eyepiece lens.

The light guide is led out of the eyepiece housing. It is beneficial the light guide through a 90 ° bend, perpendicular to the optical axis of the Eyepieces to be led out of this laterally through a hole.

The holder of the tip of the light guide in the eyepiece is done by a Double crosshair, a simple crosshair or through a pierced Glass plate.

The light guide leads from the eyepiece to the spectrograph ( Fig. 2, d).

The light guide eyepiece is then inserted into the focuser of a lens like a normal eyepiece, and the object to be observed is focused. Then the entrance surface of the light guide is in focus ( Fig. 1, e) of the objective lens ( Fig. 1, a).

Claims (5)

1. Device for holding the entry surface of an optical fiber ( Fig. 1, d; Fig. 2, c) in the focal plane ( Fig. 1, e) of an objective ( Fig. 1, a) and for guiding light rays out of the objective ( Fig. 1, a), characterized in that the entrance surface of the optical fiber ( Fig. 1, d; Fig. 2, c) in the focal plane ( Fig. 2, b) of an eyepiece lens ( Fig. 1, b) perpendicular to it optical axis ( Fig. 2, f) pointing towards the lens ( Fig. 1, a) is attached. 2. Device according to claim 1, characterized in that the optical fiber ( Fig. 1, d; Fig. 2, c) leaves the eyepiece housing ( Fig. 2, a) laterally. 3. Apparatus according to claim 1 or 2, characterized in that the holder of the entry surface of the optical fiber ( Fig. 1, d; Fig. 2, c) in the focal plane ( Fig. 2, b) of the eyepiece lens ( Fig. 1, b) happens with a double crosshair. 4. Device according to one of claims 1 and 2, characterized in that the holder of the entry surface of the optical fiber ( Fig. 1, d; Fig. 2, c) in the focal plane ( Fig. 2, b) of the eyepiece lens ( Fig. 1, b) happens through a crosshair. 5. Device according to one of the preceding claims, characterized in that the holder of the entry surface of the optical fiber ( Fig. 1, d; Fig. 2, c) in the focal plane ( Fig. 2, b) of the eyepiece lens ( Fig. 1, b) happens through a pierced glass plate.