SU104527A1 - Differential Barometer Altimeter - Google Patents

Description

The subject of the invention is a differential barometer for determining altitudes of terrain points during aerial photographic surveys.

A significant disadvantage of the known differential barometers is the change in the process of measuring the internal pressure in the instrument barometer. which leads to a decrease in the accuracy of determining the altitude by barometric leveling.

The proposed device largely eliminates this drawback. Due to the possibility of installation in the device of the initial, predetermined, pressure, errors in determining altitudes due to an inaccurate account of changes in air temperature inside the cylinder and other causes are changed.

FIG. 1 and 2, and imitated the instrument’s final hands.

The device is a wooden box /, inside of which are placed a metallic casing with fused walls: 2 and 5, which is the instrument's balloon, i a liquid-shaped pressure gauge 4. The space between the network and the casing is filled top.1C) T ZOL11I (;); 1-; мmmpschgpom. in the upper wall of the casing, the ocular part of the microcopy is fixed (an eyepiece 5 and a grid of 6 filaments), a cala 7 index and a bellows 8 with a screw 9. The lens of the microscope 10 is placed inside the balloon. Aneroid box II is attached to the bottom of the casing, on the upper wall of which a blade 12 is fixed, abutting against a mirror} 3 fine pickups and a mirror 14 (Fig. 2) of a coarse pickup. Both mirrors rotate on fixed semi-axes x 15, with the axis of rotation of the mirror 13 and ayulozhak to Ltg, the blade 12 stops closer than the axis of the mirror 14. From 5 springs 16, the mirrors press down to the blade 12.

Handling the instrument is as follows.

When measuring the height (height) on the initial nyisKTe, the cylinder is pre-sealed with a crane-valve (not shown in the drawing) 1), it is operated with a single tube. set the image of the nearest stroke and the Isaiah and; dex into the bisector of the microscope. After that, readings on the basis of meter. When measuring on all remains. (defined) points before the start of the test from ITIT i1; restoring the initial pressure inside the cylinder (casing) of the device using the bellows. For this, I act with a bellows, enter the image of the corresponding, taken at the starting point for the initial, bar of the index scale in the microscope's bisector. Then the readings on the gauge are performed in the usual way: in the order.

DEFINITIONS 3 OUTBREW AND Differential barometer-altimeter, having a v-shaped liquid manometer, one end of which is connected to the air cylinder, that, in order to maintain a constant pressure inside the cylinder and reduce, due to this, the effect of a change in the temperature of the gas in the cylinder on the accuracy of determining altitudes, aneroid box and bellows, stretchable or compressible, are installed on the inside of the cylinder.