Low-temperature humidity metre

FIELD: instrument making.

SUBSTANCE: low-temperature humidity metre includes light generator for formation of light flux, and two mirrors. At that, one mirror is equipped with cooling system with thermometre to cool its surface when dew point value is being determined. Temperature of the other mirror is kept stable and equal to the temperature of layers enveloping its atmospheres. As light generator there used is semiconductor laser or laser diode, or light-emitting diode, or luminescent diode generating light flux. On the way of light generator there located is plane convex lens. Light flux after the lens interacts with divider so that it can be split into two beams of equal intensity. Beams are directed through plane convex and rod lenses to the appropriate mirrors. On the way of light fluxes reflected from surface of mirrors there installed in series are plane convex lenses and photodetectors. The latter generate the signals proportional to intensity of light fluxes. Outputs of the above photodetectors are connected to the appropriate two inputs of information processing unit. The third input of information processing unit is connected to the output of semi-conductor thermometre. Outputs of the above unit are connected to information board and to cooling system. At that, light flux on its way from light generator to photodetectors is enclosed in light guides.

EFFECT: enlarging the range of working temperatures, improving measurement accuracy.

7 cl, 1 dwg

 

The invention relates to the field of instrumentation, namely to design digital fiber-optic low-temperature hygrometer (CUNTH), designed to determine the magnitude of the so-called dew point (TR), i.e. the temperature at which the absolute humidity of water vapor in the surrounding instrument atmosphere reaches a level of saturation.

The prior art hygrometer condensation type, which in principle is similar to the claimed moisture analyzer atmosphere (kN. Eahtr, Molecular physics, Gosizdat.-theory. lit, str). The main element known hygrometer is a brass drum with Nickel-plated front surface. The drum is filled with air and in the process of determining Proc. of the atmosphere is cooled by blowing through the air. For registration after reaching the drum temperature, coinciding with the value of TR, in the special slot it is inserted thermometer. When cooled mirror (Nickel-plated) end of the drum to TR it will begin to condense steam from the adjacent layer of the atmosphere. Resulting mirror end face of the drum becomes dull. The temperature of the drum at this point concurs with TR environmental hygrometer atmosphere.

To facilitate the registration point darken the mirror surface is Ty end of the drum is surrounded by a Nickel-plated ring keeping the temperature surrounding the device layer of the atmosphere and therefore the remaining mirror.

Also known hygrometer condensation type, which is taken as a prototype of the proposed analyzer humidity of the atmosphere, which consists of polished inside a metal tube, closed at one end frosted glass, and the other with magnifier eyepiece. The tube is placed in a metal container equipped with a thermometer and filled with air, when the definition of TR is conducted at temperatures above -40C, and liquid air (oxygen)when the definition of TR is conducted at temperatures in the range of (-40...-80)C. the air in the vessel is also forcibly circulates. The measurement accuracy of the TR this hygrometer is (0,1...0,2)C and at very low temperatures is not more than 1 (kN. With Aggregates, Fiber-optical hygrometer, M., Chapman and hall, 1987 and kN. Hingorani (translated from Japanese), Fiber optic sensors, Leningrad, Energoatomizdat, 1991)

Task to be solved by the present invention is directed, is to expand the range of operating temperatures and increase the accuracy of determination of the value of the dew point and reduce the size.

To achieve a technical result of low temperature hygrometer includes a light generator for forming a luminous flux, two mirrors, one of which is equipped with a cooling system termometro for cooling the surface of the mirror in the process of determining the value of the dew point, the temperature of the other mirror is supported by a stable and equal to the temperature of the layers surrounding it, the atmosphere, as a generator of light applied or semiconductor laser, or laser diode, or led, or luminescent diode, forming a luminous flux which is PLANO-convex lens, the light flux after which interacts with the divider with the possibility of splitting into two beams of equal intensity, channelled through the PLANO-convex and the rod lens on the corresponding mirror in the path reflected from the surface of the mirrors of the light fluxes installed in series PLANO-convex lenses and photodetectors that produce signals proportional to the intensity of light fluxes, these photodetectors their the outputs are connected with the respective two inputs of the processing unit, the third input of which is connected to the output of a semiconductor thermometer, and outputs the above-mentioned unit connected to the information Board and to the cooling system, thus the flux is on its way from the generator light to photodetectors enclosed in fiber optic cables.

There may be other embodiments of the invention, according to which you want

as a unit of information processing would be applied multimeter, made with encoders installed on E. what about the entrance with the possibility of converting analog signals into digital signals;

- cooling system would be equipped with a Peltier element.

thermometer would be performed by a semiconductor analog output measuring temperature in C cooled mirrors;

- the divisor of the light flux would be made in the form of semi-transparent mirrors.

- fiber optic cables are made of double-layer.

multimeter its output connected to the display with the possibility of formation in case of equality converted to digital output signals of the photodetectors, light and digital signals, indicating that at this point in time, the temperature of thermometer is equal to the value of the dew point of the atmosphere.

These characteristics are essential and interrelated causal connection with the formation of the essential features sufficient to achieve a technical result, namely the expansion of the range of operating temperatures and increase the accuracy of determination of the value of the dew point and reduce the size.

It is essential that at a lower temperature than the TR, on the surface, in contact with steam, highlighted the drops of dew, which upon further lowering of temperature, turn to ice. CUNTH applies, in particular, the design and construction of technical devices, machines and mechanisms operating at temperatures from -40-100)C, to those, who, for example, include space objects, the design of which includes items such as control valves. Obviously, due to icing of such devices possible by cooling them below TR, the controls will begin to fail in their operation, so knowledge of TR is absolutely necessary when designing these devices.

The invention is more fully shown in the drawing, where the drawing shows a General view of the hygrometer.

The present invention is illustrated with a specific example of implementation, which, however, is not only possible, but clearly demonstrates the possibility of achieving a given set of essential features specified technical result.

According to the invention a digital fiber-optic low-temperature hygrometer includes a generator 1 light for forming a light flux, the two mirrors 2, 3, the first of which is the mirror 2, is equipped with a cooling system 4 thermometer 5, preferably made of a semiconductor with an analog output, for cooling the surface of the mirror 2 in the process of determining the value of a dew-point measuring temperature in C cooled mirrors. Temperature is another mirror 3 is supported by a stable and equal to the temperature of the layers surrounding atmosphere. Preferably, the equipment is in the cooling system 4 Peltier element.

As the light generator 1 can be applied or a semiconductor laser, or laser diode, or led, or luminescent diode, forming a luminous flux which is PLANO-convex lens 6, luminous flux after which interacts with the divider 7, preferably made in the form of a semitransparent mirror with the possibility of splitting into two beams of equal intensity, channelled through the PLANO-convex and rod lenses 8 and 9, respectively. The mirrors 2 and 3 respectively on the path reflected from the surface of these mirrors light fluxes installed in series PLANO-convex lenses 10, 11 and the photodetectors 12, 13, generating signals proportional to the intensity of the light fluxes, the photodetectors 12 and 13 their outputs 14 and 15 are connected with the respective two inputs 16 and 17 unit 18 of the information processing. As unit 18 of the information processing can be applied multimeter, made with encoders installed on his entrance, with the possibility of converting analog signals into digital signals.

The third entrance 19 of the block 18 is connected to the output 20 of the semiconductor thermometer 5, and outputs 21 and 22 of the above-mentioned block 18 is connected to an information Board 23 and the cooling system 4, respectively.

Luminous flux on its path from the light generator 1 to photodetector the s 12 and 13 is enclosed in the optical fibers 24, which preferably are dual layer.

If execution of the block 18 in the form of a multimeter, the latter according to the scheme described above, its output is connected with the display - information Board 23, with the possibility of formation in case of equality converted to digital output signals of the photodetectors, light and digital signals, indicating that at this point in time, the temperature of thermometer is equal to the value of the dew point of the atmosphere.

It should be noted that the basic elements of structure CUNTH are mirrors 2 and 3, which are at an angle to the rays of the light flux emerging from the ends of the fiber 24. The signal path of the hygrometer is supplied from the light generator 1, which using a PLANO-convex lens 6, the light is directed to the end of the two-layer light guide 24, consisting of svetovidovi core of small diameter and the surrounding shell. Extending the core section of the optical fiber 24, the light hits the surface of the light divider 7, which is a translucent mirror that splits the light in two beams of approximately equal intensity (power). Using lenses 8 and 9, the light is introduced into the cores 25 sections of the light guide 24. It should be noted that the output ends of these sections of the optical fiber 24 are either Falconi or rod lenses,which are essentially PLANO-convex lenses, focusing the light on the surfaces of the mirrors 2 and 3. Reflected from the surfaces of the mirrors 2 and 3, the light rays going PLANO-convex lenses 10, 11 and embedded in the cores of the optical fibers 24, and then fall to the inputs of the photodetectors 12 and 13. The photodetectors 12,13 on their outputs 14, 15 form of analog signals proportional to the intensities of the rays of light emitted from the end faces of the optical fibers 24, respectively. As the photodetectors 12, 13 can be used with high sensitivity and stability of the mirrors 2, 3, which are also displayed on the display unit 23 in this moment of time, and there are TR layers of the atmosphere surrounding the device.

The essence of the principle of the device CUNTH is the following. In the initial moment of time the temperature of the mirrors 2, 3 and layers of the atmosphere surrounding the device, are equal. When the device starts to operate, due to the action of the Peltier element, the temperature of the mirror 2 will gradually decrease and reaches the value of TR, on its surface there are drops of dew, which partially absorbs and partially dissipate the energy of the light flux incident on the surface of the mirror 2. In the result, the intensity of light falling on the input of the photodetector 12, is less than the intensity of light falling on the input of the photodetector 13. As a result, the display unit 23 occurs Arcot what I label, allocating the temperature value displayed on the display at the same time. The label indicates that the temperature of the mirror 2, in a given time equal to the value of TR environmental unit of the atmosphere.

The practical application of the proposed device CUNTH allows to achieve the following objectives:

- to expand the range of variations of temperature of the atmosphere in which it can operate the device;

to increase the accuracy of the TR;

- to reduce the dimensions of the moisture analyzer;

to automate the process of determining the TR.

Determination of the dew point by using CUNTH can be carried out without participation of the operator, and, if necessary, receive information regarding the values of the dew point of one or another of the communication line can be passed on to the consumer, located at a considerable distance from the place of measurement.

The invention meets the condition of patentability "industrial applicability"because its implementation is possible using the existing means of production with the use of a known process operations and materials.

1. Low-temperature hygrometer comprising a generator of light for forming a light flux, two mirrors, one of which is equipped with cooling system with a thermometer for cooling the surface of the mirror in the process of determining importance is placed dew point, the temperature of the other mirror is supported by a stable and equal to the temperature of the layers of the surrounding atmosphere, as a generator of light applied or semiconductor laser, or laser diode, or led, or luminescent diode, forming a luminous flux which is PLANO-convex lens, the light flux after which interacts with the divider with the possibility of splitting into two beams of equal intensity, channelled through the PLANO-convex and the rod lens on the corresponding mirror in the path reflected from the surface of the mirrors of the light fluxes installed in series PLANO-convex lenses and photodetectors that produce signals proportional to the intensity of light fluxes, these photodetectors their outputs connected with the respective two inputs of the processing unit, the third input of which is connected to the output of a semiconductor thermometer, and outputs the above-mentioned unit connected to the information Board and to the cooling system, thus the flux is on its way from the generator light to photodetectors enclosed in fiber optic cables.

2. Low-temperature hygrometer according to claim 1, characterized in that the processing unit is applied multimeter, made with encoders installed on his entrance, with the possibility of converting the tax signals into digital signals.

3. Low-temperature hygrometer according to claim 1, characterized in that the cooling system is equipped with a Peltier element.

4. Low-temperature hygrometer according to claim 1, characterized in that thermometer is made of semiconductor analog output measuring temperature in C cooled mirrors.

5. Low-temperature hygrometer according to claim 1, characterized in that the divider light flux is made in the form of a semitransparent mirror.

6. Low-temperature hygrometer according to claim 1, characterized in that the optical fibers are made of double-layer.

7. Low-temperature hygrometer according to claim 2, characterized in that the multimeter its output connected to the display with the possibility of formation in case of equality converted to digital output signals of the photodetectors, light and digital signals, indicating that at this point in time, the temperature of thermometer is equal to the value of the dew point of the atmosphere.



 

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EFFECT: enlarging the range of working temperatures, improving measurement accuracy.

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