Turbomachine stage and method for determining a seal gap and/or an axial position of such a turbomachine stage

A turbomachine stage, comprising:

• a housing having an external surface;
• a moving vane arrangement disposed within the housing, wherein the moving vane arrangement disposed along an axial rotation axis and including at least one radially disposed vane disposed along a radial axis transverse to the axial rotation axis, the at least one vane having an exterior shroud band section including a sealing flange, the sealing flange having a recess arrangement including a radial recess and a radial projection, that together, define a peripheral surface of the sealing flange;
• and
• a sensor arrangement including a sensor having a sensing surface, the sensor arrangement being arranged on the housing so that the sensing surface of the sensor positionally converges towards or positionally diverges away in a direction relative to the radial axis in a direction that is different from the direction of the radial axis, and the converging or the diverging sensing surface of the sensor and the peripheral surface of the sealing flange, in combination, further define a radial clearance therebetween, and a radial distance of the radial clearance is detectable by the positionally converged or the positionally diverged sensor.