RU2689898C1 - Container for optoelectronic devices - Google Patents

Abstract

FIELD: optics.SUBSTANCE: invention can be used in instrument-making for protection of optoelectronic devices (OEP) against influence of environment, including on temperature effects. Objective of invention is expansion of lower temperature limit of operation up to minus 50 °C and avoiding the effect of turbulence on the accuracy of OED measurements. Container for optoelectronic devices consists of base, casing, on inner walls of which there are thermoelements and control unit with thermal sensor, providing thermostatting, wherein the base and the housing form a sealed container filled with an inert gas; at level of optical element of optoelectronic device in housing there are windows installed, number and location of which corresponds to number of directions to measurement objects; container housing incorporates communication unit and two unions. Thermoelectric modules on Peltier elements installed on the outer side of the container body can be used to reduce the positive temperature inside the container.EFFECT: technical result is ensuring the operability of the optoelectronic device at temperature of up to minus 50 °C and avoiding the effect of turbulence on the accuracy of OED measurements.1 cl, 2 dwg

Description

The invention can be used in instrument engineering for the protection of optoelectronic devices (EIA) from the influence of the environment, including temperature effects.

The prior art protective aerodynamic casing for optical devices, described in patent for invention RU 2256958 with priority from 03.22.2004, this technical solution is designed to protect optical devices from atmospheric influences and contains a casing covering the top and sides of optical devices with openings for the passage of optical radiation, in which screens are installed for the purpose of aerodynamic drag near optical devices.

The disadvantage of this invention is that its casing is not sealed, because of which the optics are exposed to weathering.

The prototype of the invention is the utility model RU 173874 with a priority of 08/05/2016. This technical solution presents a thermostatted case formed by two monolithic halves in which there are grooves with heating elements and thermocouples for temperature control.

The disadvantage of this invention is to ensure the health of opto-electronic devices in a limited to minus 40 ° C temperature range. Also in this technical solution it is not disclosed how OEP carry out sighting of objects through the monolithic wall of the hull.

The objective of the invention is the expansion of the lower temperature limit of operation to minus 50 ° C and the elimination of the influence of turbulence on the accuracy of OEP measurements.

The figure 1 shows the design of the proposed thermostatic sealed container for opto-electronic devices:

1. Foundation;

2. Casing;

3. Portholes;

4. Thermocouples;

5. Control unit with temperature sensor;

6. Communication unit;

7. Fittings.

The design is made as follows:

The container for opto-electronic devices includes a base (1) on which a casing (2) is installed, forming a sealed container. In the walls of the casing (2) there are windows (3), their number corresponds to the number of objects of measurement. Thermocouples (4) and a control unit with a thermal sensor (5) are mounted on the casing wall (2) from the inside. The communication unit (6) and fittings (7) are built into the container body.

Disclosure of the invention:

The casing (2) and the base (1) are designed so as to ensure complete tightness of the structure during assembly, for example, by screwing.

The tightness of the design is necessary to fill the container with an inert gas (neon, helium, nitrogen, etc.). The inert gas has in its properties a complete stable configuration of the external electron level and allows us to exclude the influence of turbulence on the OEP measurements.

The gas for filling is selected from the condition of ensuring the least optical distortion. In the presence of temperature gradients, the smallest optical distortions will occur when using a gas with a minimum refractive index n and a maximum thermal conductivity σ. Helium has the best characteristics (n = 1.000035; σ = 0.152 W / m K), however, due to its high fluidity, the use is undesirable during long-term operation.

The optimal use is for filling the container with an inert neon gas (n = 1.000067; σ = 0.049 W / m K). For comparison, nitrogen that is widely used in technical gas-filled systems has the following parameters: n = 1.000297; σ = 0,026 W / m K.

To ensure sight at the objects of measurement of OED in the container, portholes are installed (3). The number and location of the windows (3) corresponds to the number and direction of the measurement objects.

Thermocouples (4) are installed on the casing wall (2) from the inside. The use of thermoelements (4) expands the lower temperature limit of the environment to minus 50 ° С, while the EIA retains its working capacity without introducing an error in the measurements by maintaining the optimal temperature for the OED inside the container. The number of thermoelements (4) depends on the required temperature conditions for operating the EED.

Maintaining the required temperature inside the container is carried out automatically by the control unit with a thermal sensor (5), which is located on the inner wall of the casing.

Outside the container case, it is possible to install thermoelectric modules on Peltier elements with radiators that are connected through the communication unit, which allows to increase the efficiency of passive cooling of the container and consequently reduce the temperature inside it. This solution can be used in case of limiting the maximum positive operating temperature of the EIA.

The communication unit (6) is intended for power supply of the temperature control system, OED, as well as the connection of peripheral devices, such as a computer, without disturbing the tightness of the structure.

Fittings (7) are installed in the container body in the amount of two pieces, which is necessary for carrying out the procedure of blowing the container before filling it with an inert gas.

The figure 2 presents an example of execution of the invention:

- a small-sized autocollimator on a turntable (8) is shown as an EIA;

- two windows (3) are installed in the casing (2), for measuring an angle of 180 ° ± 5 °;

- the container is filled with neon;

- 2 thermoelements (4) were used to heat the container with a volume of 0.1 m ³ (one is visible in the figure), with a total capacity of 50 watts, in addition to this, the heat emission from the EIA was 100 W;

- the process of measurement, removal of indications and visualization of the process are carried out by means of a computer connected via a communication unit (5).

The EIA protected by such a design, in practical terms, provided measurement of angles with a given accuracy between objects of sight in the range of 180 ° ± 5 ° at an ambient temperature of minus 50 ° C, which is achieved by having a base (1), an enclosure for optical-electronic devices 2), on the inner walls of which thermoelements (4) and a control unit (5) with a temperature sensor are installed, providing temperature control, in which, according to the invention, the base (1) and the casing (2) form an airtight container that is filled with inert azom two fitting (7) embedded in the container body; at the level of the optical element of the opto-electronic device in the casing, windows (3) are installed, the number and location of which corresponds to the number of directions to the objects of measurement; A communication unit (6) is embedded in the container body. At the same time, to reduce the positive temperature inside the container, thermoelectric modules on Peltier elements installed on the outside of the container body can be used.

The technical result is to ensure the operability of an optoelectronic device at a temperature of up to minus 50 ° C and to eliminate the influence of turbulence on the accuracy of OEP measurements.

Claims (2)

1. A container for optoelectronic devices consisting of a base, a casing, on the inner walls of which thermoelements and a control unit with a thermal sensor are installed, providing temperature control, characterized in that the base and casing form an airtight container filled with an inert gas; at the level of the optical element of the opto-electronic device in the casing, windows are installed, the number and location of which corresponds to the number of directions to the objects of measurement; A communication block and two unions are built into the container body. 2. Container for opto-electronic devices according to claim. 1, characterized in that to reduce the positive temperature, modules on Peltier elements installed on the outside of the container body are used.

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