RU223444U1 - Extended infrared calibration emitter - Google Patents

Abstract

The utility model relates to the field of thermal measurements, namely to standard extended infrared emitters (blackbody models), and can be used in the calibration of thermal imaging and optoelectronic products. The technical result to which the claimed utility model is aimed is to increase accuracy and improve the quality of calibration operations both during the production of thermographic equipment and during its operation. The technical result is achieved by the fact that an extended infrared calibration emitter contains a housing with a fixed emitting surface based on thermoelectric modules, a temperature sensor fixed on the outside of the emitting surface, a cooling radiator attached to the inside of the emitting surface, tubes supplying coolant to the radiator, in this case, the radiating surface is divided into sections with independent control; The temperature sensor is recessed into the radiating surface and protrudes above the radiating surface, simultaneously measuring the temperature of the elements of the radiating surface and the radiating field.

Description

The utility model relates to the field of thermal measurements, namely to standard extended infrared emitters (blackbody models), and can be used in the calibration of thermal imaging and optoelectronic products.

From the existing level of technology, a black body simulator is known, in which, in order to obtain calibrated radiation fluxes corresponding to small temperature contrasts, a second hollow body with holes on opposite walls, coaxial with the hole of the first cavity, and a modulator located inside it is installed in front of the outlet hole ( RF patent for invention No. 497482 dated 02/06/1973, IPC G01J 5/00, published 12/30/1975).

The disadvantage of this device is that its use implies the presence of several similar devices in order to form temperature fields of different levels.

The closest to the claimed technical solution is a two-point radiation source with an extended surface for use in field conditions, which is made in the form of two structurally combined sources of infrared radiation, which is mainly used for calibration and testing of thermographic equipment (China Patent for invention CN102680108A dated 05/09/2012 , published September 19, 2012).

The disadvantages of this device are the use of two radiation sources for calibration in the positive and negative temperature ranges, which increases the weight and size indicators and hardware requirements, and the inability to generate dynamic thermal scenes.

The technical result to which the claimed utility model is aimed is to increase accuracy and improve the quality of calibration operations, both during the production of thermographic equipment and during its operation.

The technical result is achieved by the fact that an extended infrared calibration emitter contains a housing with a fixed emitting surface based on thermoelectric modules, a temperature sensor fixed on the outside of the emitting surface, a cooling radiator attached to the inside of the emitting surface, tubes supplying coolant to the radiator, wherein the radiating surface is configured to form a dynamic thermal scene and is divided into sections with independent control; The temperature sensor is recessed into the radiating surface and protrudes above the radiating surface, simultaneously measuring the temperature of the elements of the radiating surface and the radiating field.

The essence of the utility model is illustrated by drawings, which show:

in fig. 1 – Extended infrared calibration emitter, front view;

in fig. 2 – Extended infrared calibration emitter with cooling system, side view;

in fig. 3 – Extended infrared calibration emitter with cooling system, rear view;

in fig. 4 – Extended infrared calibration emitter with a cooling system, top view with a section;

in fig. 5 – Examples of non-uniform thermal scenes.

The extended infrared calibration emitter contains an infrared emitter (1) and a cooling system (2), fixed in the housing (Fig. 1-4).

On the front panel of the infrared emitter there are: a peripheral temperature sensor (3) and a means for indicating temperature parameters (4); a radiating surface (5), consisting of thermoelectric modules (TEM) (6), a water radiator (7) and an aluminum radiator (8) ( Fig.1, Fig.4). Inside the body of the infrared emitter there is a time relay (9) and a cooling system controller (10) and connecting couplings for tubes with coolant (11) (Fig. 4). On the rear panel of the infrared emitter there are switches (12), thermoelectric modules (6) and a connector (13) for connecting the control system (Fig. 3). The cooling system (2) of the extended infrared calibration emitter contains a water radiator (14) of the cooling system, fans (15) mounted on the water radiator, a cooling thermoelectric element (16) with a fan (17) fixed on it to improve cooling, a distribution coupling (18) and a compressor (19), for moving coolant through tubes, with a hole for pouring coolant (20) (Fig. 2, Fig. 4).

The device works as follows.

In front of the extended infrared calibration emitter, the product being calibrated is installed, for example, on a tripod or fixed to a stand, so that the optical axis of the lens of the product being calibrated coincides with the geometric axis of the emitting surface (5). The pre-radiating surface (5) is heated to +30°. In this case, the image of the thermal scene should be visible on the screen of the calibrated product, so that the entire screen is filled with the image of the thermal scene, which is ensured by choosing the distance between the calibrated product and the proposed extended infrared calibration emitter.

After which the radiating surface (5) is heated to a temperature of at least 10-15° above the expected operating temperature of the calibrated product.

Next, the image is recorded in the memory of the calibrated device for subsequent data transfer to a computer with specialized software (software) and adjustment of the parameters of the calibrated device in accordance with the received data on the image of the thermal scene.

Then the radiating surface (5) is cooled to a temperature of +30°, the time relay (9) is turned on, which prevents heating or cooling of the radiating surface for a certain time.

Next, the radiating surface (5) is cooled to a temperature of -15°.

After which the radiating surface (5) is cooled to a temperature of at least 10-15° below the expected operating temperature of the calibrated product.

Next, the image is recorded in the memory of the calibrated device for subsequent data transfer to a computer with specialized software (software) and adjustment of the parameters of the calibrated device in accordance with the received data on the image of the thermal scene.

Then the radiating surface (5) warms up to a temperature of -15°, the time relay (9) is turned on, which prevents heating or cooling of the radiating surface for a certain time.

Then, in order to check the quality of calibration, some elements of the radiating surface matrix are heated to 0 degrees, forming a non-uniform thermal scene, for example, only the upper elements of the TEM matrix or only the lower elements of the TEM matrix are heated (Fig. 5).

Claims (2)

1. An extended infrared calibration emitter containing a housing with a fixed emitting surface based on thermoelectric modules, a temperature sensor fixed on the outer side of the emitting surface, a cooling radiator attached to the inner side of the emitting surface, a time relay, a cooling system controller, characterized in that the emitting the surface is designed to form a dynamic thermal scene and is divided into sections with independent control. 2. The device according to claim 1, characterized in that the temperature sensor is recessed into the radiating surface and protrudes above the radiating surface, simultaneously measuring the temperature of the elements of the radiating surface and the radiating field.