RU1824526C - Pyrometer - Google Patents

Description

The invention relates to a technique for measuring temperature in a non-contact manner and can be used in radiation pyrometers, as well as in devices for converting a radiation flux into an electrical signal.

The purpose of the invention is to increase the sensitivity by combining the center of the receiving platform of the radiation receiver with the optical axis of the pyrometer, as well as preventing possible additional error from the installation of the receiver.

Figure 1 shows a simplified diagram of a pyrometer. The pyrometer includes a housing 1. an optical system 2, a field diaphragm 3, a radiation receiver 4. The radiation receiver is inserted into the mechanism for moving a field diaphragm consisting of a housing 5. curved under a direct

the angle of the flat plate 6 and two screws 7 and 8. The plate 6 has an opening 3, which is the field diaphragm of the pyrometer itself and two spring lobes 17, 18. As well as on its curved part 11, there are two mutually perpendicular slots 9 and 10. One of the slots 9 is parallel to the bending line of the plate, the second 10 is perpendicular to the bending line. Slots 9 and 10 engage with grooves 12, on screws 7 and 8.

In the housing 5 of the field diaphragm movement mechanism there is an opening 16 in which a radiation receiver 4 is mounted with a receiving platform 13 and a narrow slot 19 in which the field diaphragm is located.

The housing 1 of the pyrometer together with the housing 5 of the mechanism for moving the field diaphragm create a geometric axis 15. on

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which the radiation detector 4 is installed.

Due to the imperfect nature of the optical axis 2, and also due to the mismatch of the center (point Oi) of the receiving platform 13 with the geometric axis of the receiver 4, the optical axis of the pyrometer is created by the straight line 14 connecting the optical center of the optical system (point O) with the center of the receiving platform. Thus, a mismatch angle is formed between the geometric axis 15 and the optical axis 14. In those cases when the center of the field aperture (point 02) is not located on the optical axis 14. The pyrometer does not provide the required parameters (sighting index, signal level, sensitivity, etc.). The performance of the pyrometer without preliminary adjustment is also not guaranteed.

To ensure the operability of the pyrometer, a hole 17 is provided in the housing 1, allowing access to the screws 7 and 8, by means of which the diaphragm is aligned with the optical axis of the pyrometer. The field diaphragm movement mechanism operates as follows. When the screws 7 and 8 are screwed in and out, the field diaphragm 3 shifts accordingly. In this case, the field diaphragm shifts in a plane perpendicular to the optical axis of the pyrometer 14 and in the direction coinciding with the direction of movement of the screws 7 and 8 while screwing and unscrewing them simultaneously . If one of the screws remains stationary and the second is screwed in and out, the field diaphragm moves in a circle with a radius equal to the distance from the field diaphragm to the annular groove of the fixed screw.

Thus, the field diaphragm 3 can be displaced both in the direction of movement of the screws 7 and 8, and around the circumference. In Fig. 2, the arrows indicate the directions of the trajectory of the center of the field diaphragm 02 in a plane perpendicular to the optical axis of the pyrometer.

The alignment process of the pyrometer is as follows. After installing (mounting) all the components of the pyrometer, including the optical system, the mechanism for moving the field diaphragm, and the radiation receiver assembly, they proceed to install the field diaphragm itself on the optical axis of the pyrometer and bring its center 02 to the straight OOi. To do this, move the screws 7 and 8 to obtain the maximum output signal.

The pyrometer works as follows.

The radiation from the measurement object using the optical system is concentrated on the field receiving area 13 of the radiation receiver 4. Sighting indicator

The pyrometer is determined by the size of the field diaphragm and its distance to the optical system. The installation of a field diaphragm on the optical axis of the lyrometer is guaranteed by the maximum output of the pyrometer. When the temperature of the measured object changes, the radiation flux density changes, which will lead to a change in the output signal of the pyrometer, which is determined from the nominal static characteristic

5 desired temperature.

The technical and economic effect of the proposed technical solution is provided by:

-reliability and quality of the process of 0 alignment of the pyrometer;

- obtaining the maximum possible output signal and sensitivity of the pyrometer;

-the absence of the cumbersome operation of aligning the radiation receiver;

- non-critical to the quality of the optical system in terms of its installation on the bracket (body) of the pyrometer;

- less stringent requirements for the manufacture of the optical bracket (housing) of the pyrometer;

a reduced number of rejected radiation receivers due to misalignment of the receiving sites.

5 Thus, the alignment process of pyrometers is reduced by 2-3 times compared to previously known ones.

Claims (1)

SUMMARY OF THE INVENTION A pyrometer comprising a housing in which an optical system, a field diaphragm and a radiation receiver assembly are sequentially mounted on one optical axis, characterized in that, in order to increase sensitivity, by achieving alignment of the center of the receiving platform of the radiation receiver with the optical axis of the pyrometer, a also preventing possible additional error from the installation of the receiver, it is additionally 0 is equipped with a mechanism for moving the field diaphragm in a plane perpendicular to the optical axis, consisting of a mechanism body with a narrow slot for accommodating a field diaphragm and two screws with 5 holes, and the field diaphragm is made in the form of a plate with a hole, two spring lobes and a shelf curved at right angles, on which two mutually perpendicular slots are made, one of which is parallel to the bending line, which mesh with the grooves of screws that are screwed into the mechanism th therein a radiation receiver 7 FIG. i eleven