JPS59188612A - Condensing device of feeble light - Google Patents

Abstract

PURPOSE:To obtain a sufficient energy quantity required for an observation by placing a sample to which a light is projected, on the front position of a concave mirror on an optical axis line, and providing an optical sensor on a focal position of a reflected light of the concave mirror for receiving a scattered light emitted by the sample. CONSTITUTION:A reflector surface 4 of a troidal concave mirror 3 is a troidal surface, and this concave mirror 3 is inclined and set against an optical axis of a laser light B of a prescribed wavelength oscillated by a laser light source 6 provided on the back, and a laser light is irradiated through a condensing optical lens system L3 in a through-hole 5 of the center of the concave mirror 3. A sample T is installed at a position on an optical axis line of the laser light B, irradiated by the laser light B, and emits scattered lights (shown by a one point chain line in the figure) of various wavelengths. This scattered light is projected to the mirror surface 4, reflected at an almost right angle against the optical axis, and converged to an optical sensor 2 such as a photomultichip, etc. placed at a focal position of the troidal mirror surface 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for condensing weak scattered light emitted by a sample, and an object of the present invention is to obtain a large amount of information on specular reflection without aberration with certainty.

The second method is when a laser beam is irradiated onto a certain object.

The object emits scattered light of various predetermined wavelengths depending on the object's life. Therefore, it is possible to obtain information by irradiating an object with unknown physical properties with a beam of laser light and observing the wavelength of the scattered light.

However, the above-mentioned scattered light is extremely weak, and conventionally, as a means for condensing this weak light, a reliable method shown in FIG. 1 has been adopted.

ff1J, P1r constant, passes through lens L1, 8-7
The laser beam B irradiated onto the mirror 1 is reflected at right angles and irradiated onto the sample T whose physical properties are to be determined.

The sample T receiving this laser beam B emits scattered light of a predetermined color, which is transmitted through the half mirror 1, focused by the lens L2, and irradiated onto the optical sensor 2 such as a photomultichip. The physical properties of the sample T are determined by observing the wavelength of the scattered light.

However, the scattered light emitted by the sample T is likely to be mixed with various wavelengths.

When determining physical properties, it is desirable to obtain as much energy as possible.

Therefore, for example, a lens L is arranged to converge the scattered light and increase the amount of energy to the original sensor 2, but when using the lens LLK, as mentioned above, various wavelengths are included in the scattered light. Therefore, chromatic aberration inevitably occurs, and it is difficult to collect all the scattered light, so it is difficult to obtain accurate information.
Depending on the properties of the sample T, adjustment 9 is required to move the lens in the L and e axis directions, which increases the cost and requires time and effort in the lens movement operation 1 and alignment. Since this is often done, the scale and effort further increase, and there are many drawbacks, such as the inability to obtain sufficient energy for observation. (There were some inconveniences.

The present invention is a weak light condensing device developed to eliminate all of the above-mentioned drawbacks and inconveniences of the conventional art. The laser beam is irradiated onto a sample placed in front of a concave mirror, and the scattered light emitted by the sample is received by the concave mirror and further irradiated onto the original sensor placed at the focal point of the reflecting mirror.

An embodiment of the invention will be described below with reference to FIG.

Reference numeral 3 in the figure is a toroidal concave mirror, and the second reflecting mirror surface 4 is a toroidal surface. The concave mirror 3 is provided with a through hole 5 having a predetermined diameter approximately at the center thereof and on the original axis of the laser beam B.

A condensing optical lens system is fitted and fixed in the through hole 5 in alignment with the optical axis of the laser beam B, and is located in front of the concave mirror 3 facing the mirror surface 4.

The laser passes through the through hole 5 and the condensing optical lens system.

- Specimen T is installed at the position on the optical axis of light B.
Therefore, the laser beam B is irradiated onto the sample T, and the sample T emits scattered light of various wavelengths (indicated by a dashed line in the drawing)ff.

This scattered light is projected onto the mirror surface 4 facing the sample T.
Since the concave mirror 3 is inclined with respect to the optical axis of the laser beam B, the mirror surface 4. In the illustrated embodiment, the K projected 11fC scattering source is reflected almost perpendicularly to the optical axis and is focused on an optical sensor 2 such as a photomulti-chip formed of a toroidal concave mirror.

In the illustrated embodiment, only the original sensor 2 is disposed at the focal position, but in reality, the incident light amount of the collected scattered light is controlled by a slit, and it is passed through nine spectrometers to be separated into wavelengths, and then the original sensor A predetermined measurement is performed using the intensity of light from 2MC.

Harmful effects and effects of the present invention 6. It is as explained above.

Therefore, by tilting the toroidal concave mirror 3, the scattered light of the sample T located at the original axis of the laser beam B can be specularly reflected on the mirror surface 4 to the focal position accurately and without aberration. Information on scattered light can be reliably obtained by installing the optical sensor 2 at the position.

Moreover, most of the scattered light emitted by the sample T irradiates the mirror surface 4, and all of the irradiated scattered light is reflected by the optical sensor 2, so the energy of the weak scattered light is concentrated and the optical sensor 2, which is extremely effective for observing the physical properties of sample T.

Therefore, according to the weak light condensing device of the present invention, the weak scattered light of the sample emitted by laser beam irradiation can be obtained as information accurately and without aberration with the maximum amount of energy possible. , the physical properties of the sample can be observed accurately and reliably.

The configuration is simple and costs can be kept low.
It has many excellent functions and effects, such as saving time and effort in operation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing an example of a conventional device. FIG. 2 is an explanatory diagram showing one embodiment of the present invention. Explanation of symbols 2... Optical sensor, 3... Concave mirror, 4... Toroidal surface, T... Sample. Applicant (inventor) Motosuke Kiyohara Agent (patent attorney) Toshiyuki Arai. 1

Claims (1)

[Claims] 1. The above-mentioned optical signal of a concave mirror having a predetermined tilt angle with respect to the optical axis of the light beam emitted from behind. A through hole is bored in the gland Jl, a condensing optical lens system is fitted into the through hole, a sample onto which the light beam is projected is placed at a position in front of the concave mirror on the optical axis, and a A weak light concentrator consisting of an optical sensor placed at the focal point of the reflection source of a concave mirror that receives the emitted scattered light.