SU42725A1 - Optical pressure gauge - Google Patents

Description

The proposed optical instrument is designed to determine pressures and simultaneously record them with an electric recording instrument. Such a device can be used, for example, when studying the operation of individual machine tools (measuring the pressure on the cutter, on the roll cheeks during rolling, etc.). With a suitably arranged membrane, it can also serve to measure the pressure of gases and liquids.

In FIG. 1 shows a longitudinal section of the proposed device; FIG. 2 is the same, but in a modified form of implementation; FIG. 3-cross-section of a modified form of execution; FIG. 4 is a longitudinal section and FIG. 5 is a cross-section of a third modified form of embodiment.

In the embodiment shown in FIG. 1, the device consists of a box 7, provided with two oppositely located and openings, against one of which a light source 2 is placed, which by means of the optical system sends a parallel beam of rays to the photocell 3.

A lens 5 of transparent plastic mass is installed on the path of the said beam of beam. The lens is fixed in the central part of the movable cover 4. When the applied pressure P is changed

(2C8)

the lid moves, causing the lens to deform, changing its focal length. As a result, there is a change in the illumination of the photocell and a change in the current in the circuit of the recording device.

In another form (Fig. 2 and 3), the lens is replaced by an elastic polished plate - reflector 8, which can be made, for example, of stainless steel.

Moving the cover 4 causes the plate 6 to deflect and, therefore, a change in the luminous flux incident on the photocell 3. The accuracy of the instrument can be increased by using two photocells located — one with the concave and the other convex side of the mirror and included in the Wheatstone bridge. the difference in illumination of the above-mentioned photocells will be recorded.

FIG. 4 and 5 depict another possible embodiment of the device. The number 7 denotes a slit-cut diaphragm associated with the movable lid 9, and the number 8 is an opaque plate provided with a slit dividing the box Yu into two parts and reinforced at its bottom. For a more precise installation, it can be moved in the vertical direction. When changing the force P

there is a change in the size of the gap between the cuts of the said plates and, consequently, the amount of light going from the light source to the photocell 12 also changes.

The subject of the invention.

1. Optical instrument for determining pressures using a metal plate reflector, characterized in that, in order to transfer replaceable pressure to a plate-reflector 6

Box 7 is applied, opened from one or both sides along the axis and provided with a flap 4 that is movable in its grooves. 2. The optical device has been modified according to claim 1, characterized in that instead of a plate-reflector 6, two closely displaced and equipped 7 and 8 plates with calibrated notches, 5 of which are fixed to the bottom of the instrument box, and 7 is connected with a movable or elastic cover 9.

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