RU1784845C - Device for exposure energy metering - Google Patents

Abstract

Use of photometers to measure radiation energy as well as energy exposure Summary of the invention: Making a block of diaphragms in front of a radiation energy receiver in the form of a set of diaphragms with different hole sizes as follows. that the edges of the diaphragms are located on two conical surfaces, the vertices of which are turned in different directions, and the diameter of the hole formed by the intersection points of the conical surfaces coincides with the minimum diaphragm, ensures the registration of energy from extended sources while maintaining the quality of temperature control, and also provides energy registration radiation with a constant area. This makes it possible to create an energy exposure meter based on the device. 2 ill.

Description

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The invention relates to measuring technique and can be used in photometry as a means of measuring the energy exposure generated by extended sources of infrared (thermal), visible and ultraviolet radiation.

A known device for measuring the energy of laser radiation 1, which contains a block of diaphragms, a passive thermostat, a receiving element located in the housing, a quotation table and a recording device connected to the receiving element

However, this ycipci f-TBo cannot provide reliable measurements of the energy exposure from extended optical radiation sources, since the diaFra block. m receiving element

contains several apertures spaced along the beam and made with holes of the same size, as a result of which it is not possible to indicate with certain accuracy the position of that portion of the surface in question in the radiation field for which the energy exposure is measured, in addition, only the input of the receiving element of the device receives central rays from an extended source of optical radiation, while peripheral rays are shielded.

Closest to the technical nature of the claimed device is a device for measuring energy exposure, containing a diaphragm, a radiation energy receiver located in the body, a quotation device sn bg "" &

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indicated by the position of the center of the diagram, as well as a recording device.

However, this device does not allow measuring the energy exposure accurately enough, since only dmaUR is used, and the convention for the receiving element is not eliminated.

 An object of the invention is to increase the accuracy of measurements of energy exposure from extended radiation sources.

Figure 1 shows a device for measuring energy exposure; figure 2 shows the optical diagram of the device.

The device consists of a housing 1 with indicators of the position of the center of the minimum hole 2, an adjustment table 3, and its registering device 4, shown in Fig. 1. A block of diaphragms 5 with a diaphragm of a minimum aperture 6, a passive thermostat 7, and a receiving element 8, shown in fmg, 2 are placed in the device case.

The device operates as follows.

According to the indications of the center position of the minimum aperture, the housing, using an alignment table, sets the center of the device’s diaphragm block and the center of the measured portion of the radiation field, the central and peripheral rays from the extended optical radiation source, reach the minimum aperture of the diaphragm block, pass it and completely fall into the receiving element of the device. The value of energy exposure is determined by the readings of a recording instrument.

In order to register the radiation energy from long sources, the size of the aperture openings is limited by beams, the aperture of which is determined by the ratio

and arctg

Ope -D

md

2H

where OPE is the hole size of the receiving element;

DM d is the size of the minimum aperture block aperture;

H is the distance from the receiving element to the diaphragm with a minimum opening.

The specified formula follows from the geometric aspect ratios of the elements of the device, presented NC 2,

The indicated embodiment of the block of diaphragms with different hole sizes is such that the edges of the diaphragms are located on two conical surfaces symmetrical with respect to the optical axis, the vertices of which are turned in different directions, and the hole formed by the intersection points of the conical surfaces coincides with the hole

the minimum aperture, provides measurements of the energy exposure from extended radiation sources while maintaining the quality of temperature control and therefore the accuracy of measurement, as well as

provides measurements of laser radiation energy if the diameter of the laser beam in the plane of the minimum diaphragm is less than the diameter of the aperture of this diaphragm.

If a diaphragm with a minimum opening of 8.0 mm is installed at a distance of 10 mm from the receiving element with an opening of 18 mm, then the aperture of the limiting rays of the device will be 53 °. For such a device in the radiation field generated by an extended radiation source of 60 mm in size, at distances comparable to the size of the radiation source, the error in measuring the energy exposure will decrease more than

Claims (1)

10 times with respect to measurements made using known devices. SUMMARY OF THE INVENTION A device for measuring energy exposure, comprising a diaphragm located on the optical axis, an energy detector, radiation placed in a housing, a quotation device provided with indications of the position of the center of the diaphragm, and a recording device connected to the receiver, characterized in that, for the purpose of to increase the accuracy of energy exposure measurements from extended sources of optical radiation, it is additionally equipped with a passive thermostat combined with an energy receiver At the same time, the diaphragm is made in the form of a block of diaphragms with different hole sizes so that the edges of the diaphragms are located on two conical surfaces symmetrical with respect to the optical axis, with the vertices of the conical Surfaces facing in different directions, and the hole formed by the intersection points of the conical surfaces coincides with the minimum aperture, while the generators of the conical surfaces make an angle a with the optical axis, determined from the relation "Arctg where Dn is the size of the hole1 and the receiving element. Figure 1