JPS60143748A - Continuous optical axis direction measuring apparatus - Google Patents

Abstract

PURPOSE:To enable continuous measurement of a long-sized sample by detecting the intensity of transmission light, moving distance and angle of rotation concerning a sample to be mesured and a reference sample in an orthogonal Nicol optical system to display deviated angle from the optical axis along the length of the sample by image. CONSTITUTION:A reference sample 2' delivered from the lot identical to a sample 3' to be measured is set on a reference sample holder 2 and then, rotated about the optical axis of the orthogonal Nicol optical system comprising a light source 1, polarizers 4a and 4b and a photomultiplier 21. The intensity of transmission light measured during the rotation and corresponding deviated angle from the optical axis are detected with the photomultiplier 21 and a rotary encoder 23 and inputted into a microcomputer 33. Then, the sample 3' being measured is set on a holder 3, moved orthogonal to the optical axis, while respective positions thereof are detected with an rotary encoder 22 and the intensity of transmission light at the respective position is detected with the photomultiplier 21 to be inputted into the computer 33. With such an arrangement, the deviated angle of the position of a sample 3' along the length thereof is detected from the intensity of the sample 2' and the deviated angle while the results are displayed on a CRT34 with these items set on the axis of ordinate and axis of abscissa respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous optical axis direction measuring device, and more particularly to a device that can continuously measure the optical axis direction at each position along the length of a transparent sample.

When measuring the optical axis direction of a transparent sample, conventionally, as shown in FIG. A chip-shaped sample to be measured 2 is inserted between the polarizers 4a and 4b of the crossed Nicol optical system so that its surface is perpendicular to the axis of the optical system, and the sample is rotated around the axis of the optical system. The optical axis of the sample was then determined from the relationship between the rotation angle and the transmitted light intensity of the optical system. However, with such conventional devices, for example, in the case of a long and slender sample whose optical axis direction changes at each position along its length, in order to know the optical axis direction at each position, it is necessary to It is necessary to divide the sample into pieces of appropriate size and measure the optical axis direction for each sample piece, resulting in a large amount of labor and time loss.

The present invention eliminates the drawbacks of the above-mentioned prior art, makes it possible to continuously measure the optical axis direction in the longitudinal direction of a long sample, and also makes it possible to automatically display the obtained results as an image. The purpose is to provide an optical axis direction measuring device.

The present invention will be specifically explained with reference to the drawings. FIG. 2 is a perspective view showing the configuration of the device of the embodiment, and FIG. 3 is a configuration diagram of the display means in the actual device.

Light source 1. The polarizers 4a, 4b and the photomultiplier 21 constitute an orthogonal Nicol optical system. The photomultiplier 21 corresponds to the light receiver 5 in the conventional example described above, and is means for detecting the intensity of light transmitted through the crossed Nicol optical system. The motor 6 drives a saddle 101 and a nut (not shown) inside the saddle 101 via a saddle drive mechanism consisting of timing pulleys 7a, 7b, a timing belt 8, and a ball screw 9.
A sliding saddle 10 consisting of a housing 102 into which two or more linear motion bearings 103 are inserted is driven along a ball screw 9 and a guide shaft 11.11 whose ends are supported by bearings 12a and 12b. A sample 3' held in a sample holder 3 mounted on a sliding saddle is moved in the longitudinal direction perpendicular to the optical axis of the crossed Nicol optical system. These constitute the sample moving means.

The reference sample holder 2 rotates the reference sample 2' around the optical axis of the orthogonal Nicol optical system while keeping it perpendicular to the optical axis. The photomultiplier 21 and two rotary encoders 22 and 23 constitute a detection means. centre,
1) The circle 21 detects the transmitted light intensity in the orthogonal Nicol optical system, and converts it to the A/D converter 31. The information is input to the microcomputer 33 via the interface 32. The two rotary encoders 22, 23 are also connected to the sample holder 3. The reference sample holder 2 is contacted to determine the movement of the holder 3 and the amount of rotation of the boulder 2, and these are input to the microcomputer 33 via the interface 32 as displacement pulses. The microcomputer 33 includes the photomultiplexer 21 and the rotary encoder 22.2.
By comparing the information from 3, the optical axis deviation angle φ at each position of the sample to be measured is determined, and this is displayed as an image on the CRT 34. A printer 35° magnetic disk 36 is connected to the microcomputer 33 so that it can print out or store data as needed. - Measurement and display of the deviation angle in the optical axis direction at each position in the longitudinal direction of the sample 3' to be measured, that is, the angle formed between the optical axis direction of the sample 3' and the optical axis direction of the polarizer 4a will be explained.

First, a reference sample 2' cut out from the same rond as the sample to be measured 3' and having the same thickness is placed in the reference sample holder 2, and rotated around the optical axis of the orthogonal Nicol optical system. Measure the transmitted light intensity at the position. There is a relationship between the transmitted light intensity ■ and the optical axis deviation angle φ: 1=Iosinゝ(2φ) Io: proportionality constant. That is, the transmitted light intensity ■ is proportional to sinゝ(2φ). On the other hand, since the reference sample 2' is rotated, the position of the deviation angle φ-0 always exists between 0 and 90 degrees of rotation. 'Therefore, the rotation angle around the position where the deviation angle φ=0 is the deviation angle φ, and the transmitted light intensity 2 at that time corresponds to the optical axis deviation angle φ.

Therefore, by detecting the rotation angle of the reference sample 2' with the rotary encoder 23, and detecting the transmitted light intensity I of the reference sample 2' with the photomultiplier 21 and inputting it into the computer, the deviation angle φ of the optical axis and the transmitted light can be determined. The light intensity I can be made to correspond in advance.

Next, the reference sample 2' is removed, the sample to be measured 3' is set in the holder 3, and this is continuously moved in the direction perpendicular to the optical axis by the sample moving means, so that the transmitted light intensity at each position is
Continuously measure. The transmitted light intensity is detected by the photomultiplier 21 and input to the computer 33. On the other hand, the amount of movement of the sample to be measured 3' is detected by the rotary encoder 22 and input to the computer 33. In the computer 32, the longitudinal scale of the sample is determined from the moving speed of the sample to be measured, and the scale of the sample to be measured 2' is determined from the relationship between the optical axis deviation angle φ and the transmitted light intensity ■ obtained by the reference sample 2'. The corresponding optical axis deviation angle φ is given to the transmitted light intensity (2) obtained for the measured sample 3' and the reference sample 2', and since they are of the same quality and thickness, (2)0 is the same for both. ), the scale of the vertical axis is determined by this optical axis deviation angle φ. The horizontal axis is the longitudinal position of the sample to be measured 3', and the vertical axis is the optical axis deviation angle φ.
The resulting image is output to a CRT. Also, by switching the printer 35. It can be output to the magnetic disk 36. When displaying an image, the sample number can be input and displayed simultaneously with the measurement results.

The present invention has the above-described configuration, and is provided with an orthogonal Nicol optical system, a sample moving means for moving a long sample in a direction orthogonal to the optical system, a means for rotating a reference sample, etc., so that the sample to be measured can be cut into short pieces. It has now become possible to continuously measure the optical axis direction of a long piece of paper along its longitudinal direction. Moreover, since the measurement results can be automatically displayed as images, product checks can be carried out very smoothly.

Also, if you input the sample number together, you can see the sample and its results at a glance, which is convenient for printing out or recording on a magnetic disk.

[Brief explanation of the drawing]

FIG. 1 is a simplified perspective view of a conventional device, FIG. 2 is a perspective view showing the configuration of a device according to an embodiment of the present invention, and FIG. 3 is a block diagram of a display means in the device of the embodiment. 1-Light source 2-Reference sample holder 2'-Reference sample 3--Sample holder 3'-Measurement sample 4a, 4b-Polarizer 6-Motor 9
-・- Ball screw 10 - Sliding saddle 21 - Photo multimeter 22.23 - m = Rotary encoder 33 - Microcomputer 34 - CRT Patent applicant Nitto Electric Industry Co., Ltd. agent Patent attorney Nishi 1) New Fig. 2

Claims (1)

[Claims] An orthogonal Nicol optical system, a sample moving means for continuously moving the sample to be measured perpendicular to the optical axis of the orthogonal Nicol optical system, and a reference sample rotated in a state orthogonal to the optical axis of the orthogonal Nicol system. a detection means for detecting the intensity of transmitted light in the sample to be measured and the reference sample, and an angle of one rotation of the moving distance; 1. An optical axis direction continuous measuring device comprising: a display means for outputting a deviation angle as an image.