RU2760640C1 - Multichannel temperature sensor - Google Patents

Abstract

FIELD: electrical engineering.SUBSTANCE: invention relates to thermoelectric devices for measuring temperature; it can be used to record the temperature of high-speed thermodynamic processes, such as the combustion of explosives and plasma fuel systems (PFS). A multichannel temperature sensor is substrate 1, for example, made of sitall with tracks applied to it, for example three, from contacting layers of metal pairs 2 and 3 (for example, copper and nickel) capable of producing thermo-electromotive force (EMF) with the formation of a hot junction zone with a cross-sectional area of S1, S2 and S3, respectively, with S1<S2<S3 or S3<S2<S1.EFFECT: provision of high-speed performance when recording temperature profiles of high-speed thermodynamic processes.1 cl, 1 dwg

Description

The invention relates to thermoelectric devices for measuring temperature and can be used to register the temperature of high-speed thermodynamic processes, such as the combustion of explosives (HE) and pyrotechnic compositions (PTS).

You know the device described in the inventor's certificate No. 162343; IPC G01K, publ. 04/16/1964 under the name "Combined thermocouple", consisting of two thermoelectrodes connected differentially with two working junctions located in two or one protective tip at points with different wall thickness, characterized in that, in order to simultaneously obtain readings of two thermocouples of different inertia and difference of these readings with increased accuracy, the intermediate thermoelectrode is significantly lengthened and brought out to the additional terminal of the thermocouple head.

The disadvantage of this device is:

- significant dimensions;

- impossibility of registering the temperature profile of thermodynamic processes with a characteristic time (duration) of ~ 20 ms or less;

- high inertia when registering temperature.

It is also known a device containing a number of thermocouples connected in series, characterized in that, in order to improve the measurement accuracy, it is made of thermoelectrodes located in parallel and close to one another, for example, of constantan and copper microwires, and the constantan thermocouples are laid in two layers, in one of which each wire is covered with an insulating adhesive film, for example, from BF-2 glue, in the second layer constantan wires are laid with a gap in which a copper thermoelectrode is located, both layers of thermoelectrodes are covered on both sides with a continuous insulating adhesive film, for example, from BF-2 glue, to which are glued on each side of the mica leaf, described in the inventor's certificate for invention No. 342 077, IPC G01 K 7/02, publ. 06/14/1972 under the name "Thermoelectric Battery".

The disadvantages of this device are:

- the complexity of the design;

- significant dimensions;

- high inertia when registering temperature.

The closest and selected as a prototype is a multichannel temperature sensor made in the form of contacting layers of dissimilar metals deposited on a substrate, described in CN No. 104409755 of 03/11/2015, IPC G01K 7/02.

The disadvantages of the device include:

- the impossibility of registering the temperature profile of thermodynamic processes with a characteristic time (duration) of ~ 20 ms or less and rates of temperature change of the order of 100 deg / ms;

- narrow specialization of the device (measurement of the distribution of the internal temperature and the distribution of the heat flux density of the fuel cell).

The objective of the invention is to expand the operational capabilities of the proposed device, namely, the possibility of recording temperature profiles in the study of a wide range of high-speed thermodynamic processes with characteristic times (duration) ~ 20 ms or less and rates of temperature change of the order of 100 deg / ms (such as the combustion of explosives and PFS ) and improvement of weight and size characteristics.

The technical result of this invention is the ability to ensure the speed of the multichannel temperature sensor when registering temperature profiles of high-speed thermodynamic processes with characteristic times (duration) ~ 20 ms or less, and rates of temperature change of the order of 100 deg / ms.

This is achieved by the fact that the multichannel temperature sensor, made in the form of contacting layers of dissimilar metals deposited on a substrate, according to the invention, is made in the form of at least two tracks deposited on the substrate from contacting layers of dissimilar metals with the formation of a zone of hot junctions that form separate recording channels temperature and made with a varying cross-sectional area under the condition that each previous cross-sectional area of the hot junction is less or more than the next one.

The analysis of the state of the art carried out by the applicant, including a search for patent and scientific and technical sources of information and the identification of sources containing information about analogues of the claimed invention, made it possible to establish that the applicant did not find an analogue characterized by features identical to all essential features of the claimed invention, but the definition from the list identified analogs of the prototype, as the closest analogue in terms of a set of features, made it possible to identify a set of significant in relation to the technical result perceived by the applicant of the distinctive features in the claimed object set forth in the claims.

Consequently, the claimed invention meets the requirement of "novelty" under the current legislation.

To verify the compliance of the claimed invention with the condition of the inventive step, the applicant conducted an additional search for known solutions in order to identify features that match the distinctive features of the prototype of the claimed invention, the results of which show that the claimed invention does not follow for a specialist explicitly from the prior art.

Therefore, the claimed invention meets the requirement of "inventive step".

The invention is illustrated in the following drawings:

The drawing shows a general sectional view of a multichannel high-speed temperature sensor;

The drawing indicates the following positions (for three-channel version):

1 - dielectric substrate,

2 - metal 1,

3 - metal 2,

S1, S2, S3 - cross-sectional areas of hot junctions.

A multichannel temperature sensor is a substrate 1 (see drawing), for example, made of sitall with tracks applied to it, in this embodiment three, from contacting layers of a pair of metals 2 and 3 (for example, copper and nickel), capable of generating thermo-EMF with the formation in the overlap zone of layers of hot junctions with a cross-sectional area S1, S2 and S3, respectively, with S1 <S2 <S3 or S3 <S2 <S1.

Options for hot seals of the same width but different thicknesses or different widths and different thicknesses are possible.

In addition, hot-seam recording channels can be applied on both sides of the substrate.

The multichannel temperature sensor works as follows.

When the temperature changes in the area where the multichannel temperature sensor is located, each of the temperature recording channels formed by the tracks deposited on the substrate, for example, three tracks with the cross-sectional area of the hot junctions S1, S2 and S3, respectively, with S1 <S2 <S3, records the profile of the change temperature, while the section of the temperature profile recorded by the channel with the smallest cross-sectional area of the hot junction S1 (see drawing) will be the closest to the real temperature profile, since a decrease in the cross-sectional area of the track in the hot junction zone leads to a decrease in inertia and an increase in the sensitivity of the channel. If the temperature at the measuring point exceeds the melting point of one of the metals 2 or 3, the hot junction zones of the tracks will begin to collapse one by one, starting from the track with the smallest cross-sectional area of the hot junction S1, while the registration of the temperature profile will continue with the remaining channels formed by the remaining tracks with a larger area. section of the hot junction. The registration of the temperature profile stops after the destruction of the track with the largest cross-sectional area S3 of the hot junction.

An example of a specific implementation is a multichannel temperature sensor containing a sitall substrate with tracks from a copper-nickel metal pair 2, 3 deposited on it by the method of vacuum magnetron sputtering:

- with a cross-sectional area of the hot junction S1, forming the first recording channel;

- with a cross-sectional area of the hot junction S2, which forms the second recording channel;

- with a cross-sectional area of the hot junction S3 forming the third registration channel.

In this case, the condition S1 <S2 <S3 is satisfied. Hot junctions of all registration channels were made by sequential deposition of copper 2 and nickel 3 layers on the substrate by the method of vacuum magnetron sputtering with the formation of a hot junction zone (0.5 mm long). The thickness of the sprayed metals in this embodiment is ~ 1 micron. The width of the hot junctions in this embodiment was S1 = 0.5 mm, S2 = 1.0 mm and S3 = 1.5 mm. In some technical measuring circuits, the condition S1> S2> S3 can be fulfilled for the sensor.

The use of this invention will allow:

- to provide high-speed performance when registering temperature profiles of high-speed thermodynamic processes with characteristic times (duration) ~ 20 ms or less, and rates of temperature change of the order of 100 deg / ms (such as the combustion of explosives explosives and PFS);

- to obtain an effective and informative sensor for multichannel temperature measurement;

- to reduce the weight and size characteristics of the sensor.

Thus, the multichannel temperature sensor embodied in the claimed invention, when implemented, is capable of achieving the technical result seen by the applicant. Therefore, the claimed invention meets the condition of "industrial applicability".

Claims (1)

A multichannel temperature sensor made in the form of contacting layers of dissimilar metals deposited on a substrate, characterized in that it is made in the form of at least two tracks of contacting layers of dissimilar metals deposited on a flat dielectric substrate with the formation of a zone of hot junctions that form separate channels for temperature registration and made with a changing cross-sectional area under the condition that each previous hot junction cross-sectional area is less or more than the next one.

Images