TEXTILE SENSOR, SENSOR DEVICE WITH SUCH A SENSOR AND DETECTION METHOD FOR IT

Description

[0001] The present invention relates to a textile sensor, a detection device comprising such a textile sensor and a detection method implemented by means of such a detection device.

[0002] In the field of infrastructure monitoring, for example a road, a building, a structure, etc., it is common practice to equip infrastructure with sensors, which are chosen according to the parameter(s) to be monitored. For example, humidity sensors are used to detect water leaks, as are temperature sensors, etc.

[0003] Here we are interested in sensors configured to detect an impact or pressure. These sensors are used, for example, to detect a landslide along a road on a mountainside, a hailstorm on a roof, etc.

[0004] In simple terms, an impact is a pressure that lasts only for a fraction of a second.

[0005] Existing sensors only allow for local monitoring of impacts or pressure points. Therefore, it is necessary to equip the infrastructure with a network of sensors, each connected to a control unit. Installing each sensor is thus a time-consuming operation.

[0006] When sensors are connected to the control unit via a wired connection, the installation of each wire also takes time. When sensors include a wireless communication module, this module must directly integrate a power supply and an electronic management unit, which increases the cost of the sensor. An example of prior art sensors is described in document US10338755B2.

[0007] It is these problems that the invention aims to address in particular, by proposing a support sensor that is economical and practical to install.

[0008] To this end, the invention relates to a textile sensor formed by weaving conductive and insulating yarns. The textile sensor is generally ribbon-like in shape, extending along a longitudinal axis and exhibiting: a width, measured along a transverse axis which is orthogonal to the longitudinal axis, and a thickness measured along a thickness axis, which is orthogonal to the longitudinal axis and the transverse axis.

[0009] According to the invention: The sensor comprises two textile layers, arranged opposite each other and connected by connecting threads. Each layer comprises two lateral bands, opposite each other, extending along the longitudinal axis and separated by a central band. The central band comprises warp threads including the conductive threads, so as to form a conduction track extending parallel to the longitudinal axis between the lateral bands. The connecting threads connect each lateral band of one layer to a respective lateral band of the other layer. The conduction track of one layer is arranged opposite the conduction track of the other layer. The connecting threads together form an elastically deformable damping structure in a relaxed configuration, in which the damping structure maintains the two conduction tracks apart and opposite each other.and a constrained configuration, in which two conduction tracks are closer to each other than in the relaxed configuration, the damping structure tending to return to its relaxed configuration by elastic recoil.

[0010] Thanks to the invention, the conduction tracks are brought into contact with each other when the textile sensor is subjected to compression, causing the damping structure to shift into a stressed configuration. The conduction tracks thus form a closed electrical circuit. This shift of the damping structure can occur locally along the entire length of the textile sensor. It is therefore possible, with a single textile sensor, to detect compression at any point along its length. Installing the textile sensor is thus more practical and economical than installing a prior art sensor network.

[0011] According to advantageous but not mandatory aspects of the invention, such a textile sensor may incorporate one or more of the following features taken individually or in any technically permissible combination: Each weft yarn is monofilament and preferably has a diameter between 0.1 and 0.2 mm, more preferably between 0.12 and 0.18 mm, and more preferably 0.15 mm. Each ply comprises one conductive weft yarn, while the bonding yarns are insulating. The bonding yarns have a count between 17 and 1000 dtex, preferably between 100 and 500 dtex, and more preferably between 150 and 200 dtex, and / or each bonding yarn comprises between 1 and 200 strands, preferably between 20 and 150, and more preferably between 40 and 100. The conductive yarns are metallic copper wires, preferably made of copper or one of its alloys.

[0012] The invention also relates to a detection device, comprising: a compliant textile sensor as defined above, a connector, which is mounted on the textile sensor and which includes at least two input terminals, each input terminal being connected to a respective conduction track of the textile sensor, a control unit, which is connected to each of the conduction tracks of the textile sensor via the connector, the electronic control unit comprising: a logic processing unit, an electrical power source, in which the electronic control unit is configured: to apply a first electrical quantity to the input terminals, to measure a second electrical quantity at the input terminals, as a function of the first and second electrical quantities, deduce information on the state of the textile sensor.

[0013] The invention also relates to a detection method implemented using the detection device as defined above, the detection method comprising the successive steps of: a) apply a first electrical quantity to the input terminals connected to the two conduction tracks, and measure a second electrical quantity at the input terminals, b) as a function of the first and second electrical quantities, deduce information on the state of the textile sensor.

[0014] This method induces the same advantages as those mentioned above regarding the textile sensor of the invention.

[0015] Advantageously: In step a), the first electrical quantity is a DC voltage applied between the input terminals, while the second electrical quantity is an electric current. In step b), if the second electrical quantity is non-zero, then a contact between the two conduction tracks is inferred. In step a), the first electrical quantity is an electric current, while the second electrical quantity is an electric voltage. In step b), the capacitance of the textile sensor is deduced, the calculated value being stored in a memory of the control unit. Steps a) and b) are repeated several times, and the successive capacitance values ​​are compared. If a difference between two successive capacitance measurements is non-zero, then a change of state of the sensor is inferred, specifically a sensor failure.

[0016] The invention will be better understood, and other advantages thereof will become more apparent, in light of the following description of two embodiments of a textile sensor, a detection device, and a detection method, conforming to its principle, given solely by way of example and with reference to the accompanying drawings, in which: [ Fig 1 ] there figure 1 is a perspective view, partially exploded, of a detection device according to a first embodiment of the invention, the detection device comprising a textile sensor, also according to the invention; [ Fig 2 ] there figure 2 schematically represents a perspective view of the textile sensor of the figure 1 ; Fig 3 ] there figure 3 represents, on two inserts a) and b), the textile sensor of the figure 2 , observed in section along two planes AA and BB at the figure 2 ; Fig 4 ] there figure 4 is a perspective view of a control unit of the detection device figure 1 ; Fig 5 ] there figure 5 is a synoptic diagram illustrating the steps of a detection method implemented using the detection device of the figure 1 , And [ Fig 6 ] there figure 6 represents respectively and in a simplified manner, on two inserts a) and b), a cross-section of the textile sensor of the figure 2 and a similar cross-section of a textile sensor according to a second embodiment.

[0017] A detection device 10 is shown on the figure 1 The detection device 10 comprises a textile sensor 100, according to a first embodiment of the invention, a connector 20 and an electronic control unit 50, which is connected to the textile sensor 100 via the connector 20.

[0018] By "textile," we mean that the Sensor 100 is made of a material composed of interwoven threads. The Textile Sensor 100—also simply called "Sensor 100"—is formed by weaving threads, specifically by weaving conductive and insulating threads, as detailed later. The Sensor 100 generally has a ribbon-like shape. The Sensor 100 is thus manufactured continuously. During installation, the Sensor 100 is cut to the length required by the user.

[0019] In the following, we assume that the textile sensor 100 is laid flat, although in reality, the sensor 100 can be folded, rolled, curved, etc., depending on the geometry of the surface to which it is attached. The sensor 100 extends along a longitudinal axis X100 and has a length L100, measured along the longitudinal axis X100, and a width ℓ100 measured along a transverse axis Y100, which is orthogonal to the longitudinal axis X100. When the sensor 100 is laid flat, it extends along a mid-plane P100, which is parallel to the longitudinal axis X100 and the transverse axis Y100.

[0020] The sensor 100 comprises two textile layers 110, arranged opposite each other and connected by connecting wires 140. Each layer 110 extends on either side of the mid-plane P100. A thickness E100 of the sensor 100 is defined as the distance between the two textile layers 110, measured along a thickness axis Z100, which is orthogonal to the longitudinal axis X100 and the transverse axis Y100. In other words, the thickness axis Z100 is orthogonal to the mid-plane P100. When the sensor 100 is unrolled and not subjected to any other external stress, the thickness E100 is considered to be constant over the entire sensor 100.

[0021] In the example shown, the width ℓ100 is 25 mm, while the thickness E100 is 3 mm. The proportions are not to scale in the drawings. The length L100 is chosen by the user based on the length of the area to be monitored with the sensor 100. This length can be a few tens of centimeters or several hundred meters, or even exceed 1 kilometer.

[0022] The two layers 110 are preferably symmetrical with respect to the mean plane P100. The layer 110 shown in the lower part of the figures is described in more detail below. What is true for this layer 110 is applicable to the other layer 110, by symmetry with respect to the mean plane P100. Each layer 110 is formed by weaving warp and weft threads. On the figure 1 , four warp threads 112 and four weft threads 114 are schematically represented in continuous lines, the others being omitted for the sake of simplification, even though the whole of the sheet 110 is made up of woven threads 112 and 114.

[0023] Each layer 110 comprises two opposing edges 116A and 116B, which are parallel to the longitudinal axis x100 and along which extend two lateral bands 118A and 118B. The two lateral bands 118A and 118B are thus opposite each other and extend along the longitudinal axis X100. The two lateral bands 118A and 118B are separated by a central band 120.

[0024] The central bands 120 of the two textile layers 110 are arranged opposite each other and define between them a cavity C120.

[0025] The central band 120 comprises warp wires 112 which include conductive wires 122, so as to form a conduction track 124, which extends parallel to the longitudinal axis X100. In other words, some of the warp wires 112 are electrically conductive wires 122, the others being electrically insulating wires, referenced 123. On insert a) of the figure 3 The electrically conductive warp threads 122 are schematically represented in white and the electrically insulating warp threads 123 are schematically represented in black. On insert b) of the figure 3 , electrically conductive warp threads 122 are schematically represented in dashed lines and electrically insulating warp threads 123 are schematically represented in black.

[0026] In the illustrated example, there are four conductive wires 122. These wires are made of a conductive material, preferably metallic, more preferably copper or one of its alloys. Advantageously, metallic conductive wires 122 are coated with a surface treatment to prevent oxidation. For example, the conductive wires 122 are silver-plated. The conductive wires 122 are preferably multi-stranded, in particular twisted multi-filament wires. In the illustrated example, the conductive wires 122 are twisted multi-filament copper wires. This conductive wire technology facilitates weaving and ensures satisfactory flexibility in the textile webs 110.

[0027] The conduction track 124 is a portion of the central band that includes all the conductive wires 122 and whose width corresponds to the distance, measured along the transverse axis Y100, between the two most distant conductive wires 122. In the illustrated example, each central band 120 has a width e120, measured parallel to the transverse axis Y100, of 6 mm, while the conduction track 124 has a width ℓ124 of 3 mm, the conductive wires 122 being spaced 1 mm apart. The conduction tracks 124 of the two textile layers 110 are arranged opposite each other, while each lateral band 118A or 118B, belonging to one of the layers 110, is arranged opposite a lateral band belonging to the other layer 110.

[0028] The connecting wires 140 link each lateral strip 118A or 118B of a layer 110 to that of the lateral strips located opposite, so the conduction track 124 of one of the layers 110 is kept opposite the conduction track 124 of the other layer 110. It is understood that the textile sensor 100 is obtained by three-dimensional weaving, also called 3D weaving.

[0029] An example of the arrangement of warp wires 112, including conductor wires 122 and insulating wires 123, weft wires 114 and bonding wires 140 is illustrated in the figure 3 The insert a) is a cross-section of the sensor 100 along a cutting plane orthogonal to the warp wires 112, which are represented by black dots for the insulating wires 123 and by white ellipses for the conducting wires 122. The weft wires are represented by solid black lines. The bonding wires 140 are represented by dashed lines.

[0030] Inset b) is a cross-section of the sensor 100 along a cutting plane orthogonal to the weft yarns 114, which are represented by dots. The bonding yarns 140 are shown as dashed lines, while the conductive warp yarns 122 are shown as dashed lines and the insulating warp yarns 123 are shown as solid black lines. The conductive yarns 122 are embedded in the corresponding textile web 110, specifically woven as warp yarns of this textile web, so that they form an integral part of this textile web 110. The conductive yarns 122 are not free to move in longitudinal or transverse translation relative to the rest of the corresponding textile web 110.

[0031] In the example, the insulating warp yarns 123 interlace around each successive weft yarn 114, with a taffeta-type weave to homogenize the flexibility of the plies 110. Conversely, the conducting yarns 122 are advantageously located preferentially on the side of the cavity C120, so as to increase the surface area of ​​each conduction track 124 relative to the other conduction track 124. To this end, the conducting yarns 122 are woven with a "floating" weave relative to the plie 110 to which they belong. By floating weave, we mean, for example, a satin, twill, or basketweave, in which the floats are oriented towards the cavity C120. In the example of the figure 3b ), the floats of the conductive wires 122 are of three wires. The floats are preferably less than 8 wires, to prevent the two conductive tracks 124 from coming into contact with each other when the textile sensor 100 is folded.

[0032] The connecting wires 140 together form an elastically deformable damping structure 141 between a relaxed and a constrained configuration. The damping structure 141 is formed by all the connecting wires 140, located on either side of the cavity C120 along the transverse axis Y100. In the relaxed configuration, which corresponds to the case where no external crushing force is exerted on the sensor 100, the damping structure 141 maintains the two webs 110, and therefore the two conduction tracks 124, at a distance and facing each other along the thickness axis Z100. In the constrained configuration, the damping structure 141 is elastically compressed upon itself, to the point that the two conduction tracks 124 are closer to each other than in the relaxed configuration. The damping structure 141 tends to return to its relaxed configuration by elastic return.

[0033] As long as no external force is applied to the textile sensor 100, the two conduction tracks 124 remain, under the action of the damping structure 141, at a constant distance from each other, approximately equal, within the thicknesses of the textile layers 110, to the thickness E100 of the textile sensor 100. When an external support force is applied to the textile sensor 100 parallel to the axis of thickness Z100, this support force tends to bend the connecting wires 140 and to crush the damping structure 141, bringing the conduction tracks 124 closer together. If the support force is sufficient, the conduction tracks 124 come into contact with each other, following the complete crushing of the damping structure 141 at the point where the support force is exerted.

[0034] The stiffness of the textile sensor 100 is defined as equal to the mass that must be applied to a disk with a surface area of ​​1 cm² (square centimeters) centered on the conduction track 124 of the upper layer 110 to bring the conduction tracks 124 into contact with each other. The mass is expressed in kilograms. The surface area of ​​1 cm² is approximately the size of a finger. The stiffness of the textile sensor 100 is therefore similar to pressure and corresponds to the capacity of the textile sensor 100 to resist crushing. In the illustrated example, the textile sensor 100 has a stiffness of 1 kg / cm², which corresponds to a mass of 1 kg applied to 1 cm².

[0035] The stiffness of the textile sensor 100 depends in particular on the number and nature of the connecting wires 140, their size, or count, the number of strands that make up each connecting wire 140, etc.

[0036] Preferably, the 140 bonding threads are synthetic, so as to withstand environmental stresses, particularly humidity, and to maintain stable mechanical properties over time. Even more preferably, the 140 bonding threads are made of polyester, so as to resist ultraviolet radiation.

[0037] It is understood that the thicker the 140 bonding yarns, the stiffer they are. A yarn's count is generally expressed in "dtex," or decitex, which corresponds to the mass in grams of 10,000 meters of that yarn. 140 bonding yarns typically have a count between 78 and 1000 dtex, preferably between 100 and 500 dtex, and even more preferably between 150 and 200 dtex. In the example shown, the count of the 140 bonding yarns is 167 dtex.

[0038] Wires are generally composed of several strands, which are twisted together to form the wire. Schematically, for a given yarn count, the more strands a wire has, the more flexible it is. Bonding wires 140 each have between 10 and 200 strands, preferably between 20 and 150, and even more preferably between 40 and 100. In the example shown, the bonding wires 140 have 48 strands.

[0039] When the sensor 100 is bent parallel to the transverse axis Y100, for example to follow a curved surface on which it is placed, the layers 110 tend to come closer together at the bend, and the conductive tracks 124 may accidentally come into contact with each other, even if no other external force is applied to the sensor 100. Advantageously, using a monofilament yarn for the weft yarn 114 of the layers 110 reduces this risk of the textile layers 110 coming closer together at any transverse bends. Such a monofilament yarn is also called "hair." Advantageously, the monofilament weft yarn 114 has a diameter between 0.1 and 0.2 mm, preferably between 0.12 and 0.18 mm. In the illustrated example, weft yarn 114 is a monofilament yarn, made of a synthetic material, here polyester, and has a diameter of 0.15 mm.

[0040] The connector 20 comprises a main body 22, which is here made of two parts 22A and 22B, which are clamped onto the textile sensor 100 in the assembled connector configuration. The connector 20 also includes a terminal block 24, which is here projected onto the main body 22 and which includes at least two electrical contacts 26. The electrical contacts 26 are represented here by ten holes. The terminal block 24 is therefore a female terminal block. Of these electrical contacts 26, two are respectively connected to the two conduction tracks 124 of the textile sensor 100. These electrical contacts 26 connected to the conduction tracks 124 are thus the input terminals of the connector 20.

[0041] On the figure 4 The control unit 50 is partially shown, with one cover omitted to reveal its internal components. The control unit 50 comprises a housing 51 which contains a logic processing unit 52 and a power supply 54 to power the logic processing unit 52. The power supply 54 is a battery. The control unit 50, and by extension the detection device 50, are thus self-contained. In an alternative configuration not shown, the power supply is external to the housing 51.

[0042] The logic processing unit 52 is represented by a printed circuit board on which various electronic components are mounted. The logic processing unit 52 thus includes, among other things, a microprocessor 53A and a memory 53B, the memory being configured to store instructions executable by the microprocessor and to record the results of calculations performed by the microprocessor.

[0043] The control unit 50 also includes an additional terminal block 56, which is located on an external surface of the housing 51. The additional terminal block 56 is configured to cooperate, notably through complementary shapes, with the terminal block 24 of the connector 20. The additional terminal block 56 is therefore a male terminal block, which includes pins 58, configured to be electrically connected to the electrical contacts 26 when the additional terminal block 56 is assembled with the terminal block 24. The pins 58 are electrically connected to the logic processing unit 52.

[0044] On the figure 1 The control unit 50 is shown away from connector 20 to reveal terminal block 24. When the additional terminal block 56 is connected to terminal block 24, the logic unit 52 is connected to the input terminals of connector 20, in other words, is connected to the conduction tracks 124 of textile sensor 100.

[0045] In an alternative not shown, the electronic control unit 50 is connected to the connector 20 via an extension, for example a cable bundle or a textile bundle incorporating conductive tracks.

[0046] The logic unit 52 is configured to apply a first electrical quantity to one of the two input terminals mentioned above, and to measure a second electrical quantity at the other input terminal. Based on the values ​​of the first and second electrical quantities, information about the state of the textile sensor 100 is deduced. The control unit 50 advantageously includes warning means 60, schematically represented by a component of the logic unit 52, the warning means 60 being configured to transmit to the user information relating to the state of the textile sensor 100.

[0047] In the illustrated example, the alerting means 60 include a radio frequency device configured to send the user an alert message when a crushing of the textile sensor is detected. Alternatively, the alerting means 60 include light-emitting diodes, or LEDs, to transmit a visual signal to the user, a vibrator, also known as a "buzzer," to transmit an audible signal to the user, etc.

[0048] We will now go into detail, using the figure 5 , a detection method implemented using detection device 10.

[0049] During a step 70, the logic unit 52 applies a first electrical quantity to the input terminals of the connector 20 which are connected to the two conduction tracks 124. In the illustrated example, the first electrical quantity is a DC electrical voltage V1 applied between these two input terminals.

[0050] During step 80, logic unit 52 measures a second electrical quantity at the input terminals. In the illustrated example, the second electrical quantity is an electric current flowing between the two input terminals of connector 20, which are connected to the two conduction tracks 124. The measured electric current has an intensity of I2.

[0051] If the textile sensor 100 is not crushed, then the conduction tracks 124 are not in contact with each other, and no electric current can flow between the two conduction tracks 124. In this case, the current is zero and its intensity I2 is 0.

[0052] Conversely, if the textile sensor 100 is crushed, causing the conduction tracks 124 to come into contact with each other, then a current can flow between the two terminals 26 connected to the two conduction tracks 124. The measurement of a non-zero electric current intensity I2 at the input terminals of the connector 20 therefore indicates contact between the two conduction tracks 124, in other words, indicates that the textile sensor 100 is crushed.

[0053] During step 90, the electronic control unit 50 checks whether the current intensity I2 is non-zero. If this intensity is zero, the control unit returns to step 70. Otherwise, a crush is detected and an alert signal is transmitted to the user, using the alerting means 60, during step 99. In the illustrated example, the alert message sent to the user includes the time at which the crush of the textile sensor 100 was detected.

[0054] The sequence of steps 70 to 90 constitutes a measurement cycle of the detection device 10. This measurement cycle is advantageously repeated several times, preferably at regular intervals, and the measured values ​​are recorded in memory 53B of the logic unit 52 along with information about the measurement time. In the illustrated example, the measurement cycle is repeated at a frequency of 10 kHz (kilohertz). This makes it possible to detect crushing events that last only fractions of a millisecond. Such crushing events correspond to falling objects, for example, pebbles, hail, etc., which crush the textile sensor 100 for a very short time.

[0055] It is understood that a hailstone, even a large one, will likely have less impact on the textile sensor 100 than a large pebble. More generally, the stiffness of the textile sensor 100 is adapted according to the type of crushing force being detected. As mentioned previously, it is possible to adjust the type of connecting wires 140 to adapt the properties of the damping structure 141. It is also possible to adjust, for the same purpose, the total number and / or the arrangement of the connecting wires 140, which link the lateral bands 118A and 118B of the textile layers 110.

[0056] There figure 6 Insert a) represents a cross-section of the textile sensor 100 according to the first embodiment, while insert b) is a cross-section of a textile sensor 200 according to a second embodiment. In both inserts a) and b), the insulating warp threads are not shown.

[0057] In the second embodiment, elements analogous to those in the first embodiment bear the same references and function in the same way. The main differences between the first and second embodiments are described.

[0058] In the first embodiment, the connecting threads 140 are woven continuously, along the transverse axis Y100, at each lateral band 118A or 118B. Each lateral band 118A or 118B thus comprises a single group of twelve connecting threads 140.

[0059] In the second embodiment, the connecting wires 140 are the same as the connecting wires of the first embodiment, but the connecting wires 140 are woven discontinuously along the transverse axis Y100, at each lateral band 118A or 118B. For each lateral band 118A or 118B, the connecting wires 140 are here divided into two groups 142 and 144, which each comprise four connecting wires 140 and are separated by a cavity C146.

[0060] It is understood that the stiffness of the textile sensor 200 of the second embodiment is less than the stiffness of the textile sensor 100 of the sensor of the first embodiment. In the illustrated example, the stiffness of the textile sensor 200 is equal to 0.5 kg / cm².

[0061] In both embodiments, the weft yarns 114 of the webs 110 are made of an electrically insulating material, in particular a synthetic material, preferably polyester.

[0062] In an alternative not shown, the weft yarns 114 include yarns made of a conductive material. For example, the weft yarns 114 include conductive yarns similar to the conductive yarns 122. The conductive yarns 122, arranged parallel to the longitudinal axis X100, are thus connected by each of the conductive weft yarns 114. In this way, each conductive band 124 becomes a conductive surface. The textile sensor thus comprises two conductive surfaces facing each other, forming a capacitor. The connecting yarns 140 are insulating. Preferably, all the warp yarns 112 of the central bands 120 are conductive yarns, for example of the type of conductive yarns 122, so as to enlarge the two conductive surfaces. Alternatively, the warp yarns 112 of the side bands 118A and 118B of each layer 110 also include conductive yarns.

[0063] A capacitor exhibits a capacitance that depends on the geometry of the opposing conductive surfaces, as well as the gap between these two conductive surfaces, without any contact between them. It is therefore possible to deduce a closer proximity of the conduction tracks 124 by measuring a change in the capacitance of the capacitor formed by the textile sensor.

[0064] The detection method described above is adapted on this principle.

[0065] The first electrical quantity applied in step 70 is a variable electric current, while the second electrical quantity detected in step 80 is an electric voltage. This measures the charge of the capacitor formed by the two opposing conduction tracks 124.

[0066] In step 90, a capacity value of the textile sensor is deduced from the values ​​applied and measured in steps 70 and 80, the calculated value being recorded in memory 53B of the control unit 50.

[0067] Steps 70 to 90 are repeated several times, and the successive capacity measurements are compared with each other.

[0068] If a difference between two successive capacitance measurements is non-zero, then we deduce a change of state of the sensor, in particular a crushing of the sensor.

[0069] An alert can then be sent to the user using alert means 60.

[0070] The embodiments and variants mentioned above can be combined to generate new embodiments of the invention.

Claims

1. A textile sensor (100; 200) formed by weaving conductive threads (122) and insulating threads, the sensor being generally ribbon-shaped, extending along a longitudinal axis (X100) and having: - a width (L100), measured along a transverse axis (Y100) which is orthogonal to the longitudinal axis (X100), and - a thickness (E100) measured along a thickness axis (E100), which is orthogonal to the longitudinal axis (X100) and the transverse axis (Y100), - the textile sensor (100; 200) comprises two textile sheets (110), which are arranged facing each other, and which are connected to each other by so-called connecting threads (140), characterised in that: - each sheet comprises two lateral strips (118A, 188B), which are opposite each other, which extend along the longitudinal axis (X100) and which are separated by a central strip (120), the central strip comprising warp threads (112) including the conductive threads (122), so as to form a conduction track (124) which extends parallel to the longitudinal axis (X100), - the connecting threads (140) connect each side strip of one sheet to a respective side strip of the other sheet, - the conduction track (124) of one sheet is arranged opposite the conduction track (124) of the other sheet, - the connecting threads (140) together form a damping structure (141) that is resiliently deformable between a relaxed configuration, wherein the damping structure holds the two conduction tracks (124) at a distance from and facing each other, and a stressed configuration, wherein two conduction tracks (124) are closer together than in the relaxed configuration, the damping structure (141) tending to return to its relaxed configuration by resilient return.

2. The textile sensor (100; 200) according to the preceding claim, wherein each sheet (110) comprises a conductive weft thread (114), while the connecting threads (140) are insulating.

3. The textile sensor (100, 200) according to the preceding claim, wherein: each weft thread (114) is monofilament and preferably has a diameter of between 0.1 and 0.2 mm, more preferably between 0.12 and 0.18 mm, even more preferably equal to 0.15 mm.

4. The textile sensor (100; 200) according to any one of the preceding claims, wherein: - the connecting threads (140) have a titre of between 17 and 1000 dtex, preferably between 100 and 500 dtex, even more preferably between 150 and 200 dtex, and / or - the connecting threads (140) each comprise a number of strands between 1 and 200, preferably between 20 and 150, and even more preferably between 40 and 100.

5. The textile sensor (100; 200) according to any one of the preceding claims, wherein the conductive threads (122) are metal wires, preferably made of copper or one of its alloys.

6. A detection system, comprising: - a textile sensor (100; 200) according to any of the preceding claims, - a connector (20), which is mounted on the textile sensor and which comprises at least two input terminals, each input terminal being connected to a respective conduction track (124) of the textile sensor, - a control unit (50), which is connected to each of the conduction tracks (124) of the textile sensor (100; 200) via the connector (20), the electronic control unit comprising: • a calculation logic unit (52), • an electrical energy source (54), wherein the control unit (50) is configured: - to apply (70) a first electrical quantity to the input terminals, - to measure (80) a second electrical quantity at the input terminals, - as a function of the first and second electrical quantities, to deduce (90) information about the state of the textile sensor (100; 200).

7. The detection method, implemented by means of the detection device (10) according to the preceding claim, the detection method comprising the successive steps of: a) applying (70) a first electrical quantity (V1) to the input terminals (26) connected to the two conduction tracks (124), and measuring (80) a second electrical quantity (I2) at the input terminals, b) as a function of the first and second electrical quantities, to deduce (90) information about the state of the textile sensor (100; 200).

8. The detection method according to the preceding claim, wherein: - in step a), the first electrical quantity is a DC voltage (V1), applied between the input terminals, while the second electrical quantity is an electrical current (I2), - in step b), if the second electrical quantity (I2) is non-zero, then contact is inferred between the two conduction paths (124).

9. The detection method according to claim 7, the textile sensor being as claimed in claim 2, wherein: - in step a), the first electrical quantity is an electrical current, while the second electrical quantity is an electrical voltage, - in step b), a capacitance of the textile sensor is deduced, the calculated value being stored in a memory in the control unit, - steps a) and b) are repeated several times, and the successive capacitance values are compared with each other, - if a difference between two successive capacitance measurements is non-zero, then a change in the state of the sensor is inferred, in particular a crushing of the sensor.