Sensor intended to monitor a target piece, the sensor comprising: - a set of electrically conductive particles, at least a portion of the conductive particles constituting a conductive network of which one electrical property is a function of an arrangement of the conductive particles constituting the conductive network, said arrangement being modifiable, - a ceramic phase of protection of the conductive network, the ceramic phase being composed of ceramic particles, the ceramic phase comprising more than 90% of ceramic particles having a length of between 0.1 and 100 μm, called "fine ceramic particles", as a percentage by number, the ceramic particles being made of a material exhibiting an electrical resistivity, measured at 20°C, greater than 1 S2.m, the arrangement of the conductive particles being "modifiable" in that, under the effect of a strain, the arrangement of the conductive particles of the conductive network is modified such that the result thereof is a modification of the impedance of the conductive network, the sensor being characterized in that: - the sensor is intended to monitor a target piece at a temperature greater than 400°C, - more than 90% of the conductive particles, called "elongated conductive particles", as a percentage by number, have a form factor greater than 2 and a thickness less than 20 000 nanometres, the form ratio of a particle being equal to the ratio of the length of said particle divided by the thickness of said particle, and - the conductive particles are made of a material exhibiting an electrical resistivity, measured at 20°C, less than 1 mS2.m. - a set of electrically conductive particles, at least a portion of the conductive particles constituting a conductive network of which one electrical property is a function of an arrangement of the conductive particles constituting the conductive network, said arrangement being modifiable, - a ceramic phase of protection of the conductive network, the ceramic phase being composed of ceramic particles, the ceramic phase comprising more than 90% of ceramic particles having a length of between 0.1 and 100 μm, called "fine ceramic particles", as a percentage by number, the ceramic particles being made of a material exhibiting an electrical resistivity, measured at 20°C, greater than 1 S2.m, the arrangement of the conductive particles being "modifiable" in that, under the effect of a strain, the arrangement of the conductive particles of the conductive network is modified such that the result thereof is a modification of the impedance of the conductive network, the sensor being characterized in that: - the sensor is intended to monitor a target piece at a temperature greater than 400°C, - more than 90% of the conductive particles, called "elongated conductive particles", as a percentage by number, have a form factor greater than 2 and a thickness less than 20 000 nanometres, the form ratio of a particle being equal to the ratio of the length of said particle divided by the thickness of said particle, and - the conductive particles are made of a material exhibiting an electrical resistivity, measured at 20°C, less than 1 mS2.m. the ceramic particles being made of a material exhibiting an electrical resistivity, measured at 20°C, greater than 1 S2.m, the arrangement of the conductive particles being "modifiable" in that, under the effect of a strain, the arrangement of the conductive particles of the conductive network is modified such that the result thereof is a modification of the impedance of the conductive network, the sensor being characterized in that: - the sensor is intended to monitor a target piece at a temperature greater than 400°C, - more than 90% of the conductive particles, called "elongated conductive particles", as a percentage by number, have a form factor greater than 2 and a thickness less than 20 000 nanometres, the form ratio of a particle being equal to the ratio of the length of said particle divided by the thickness of said particle, and - the conductive particles are made of a material exhibiting an electrical resistivity, measured at 20°C, less than 1 mS2.m. - the sensor is intended to monitor a target piece at a temperature greater than 400°C, - more than 90% of the conductive particles, called "elongated conductive particles", as a percentage by number, have a form factor greater than 2 and a thickness less than 20 000 nanometres, the form ratio of a particle being equal to the ratio of the length of said particle divided by the thickness of said particle, and - the conductive particles are made of a material exhibiting an electrical resistivity, measured at 20°C, less than 1 mS2.m.