Sensor configuration for non-invasive measurement of parameters of a body tissue with a sensor unit and a sensor mat for detachable placement of the sensor configuration on a body surface, characterized in that ▪ the sensor configuration comprises a contact head, designed for electrical contacting of the sensor unit and for supply of light from a light source to the sensor unit, whereby the contact head is able to be received on the sensor unit and is connectible thereto, ▪ the sensor unit is designed as a flexible printed circuit board; with optical components, comprising at least one light detector device, in order to detect light that has been emitted from the contact head, received on and connected to the sensor unit, into the body tissue and has passed through the latter, and with a first contact means and conducting tracks for operative connection of the sensor unit to the contact head, ▪ and whereby the sensor mat has a multi-layered structure, with a lower layer, having a lower contact surface for contact on the body surface and an upper contact surface for support of the sensor unit, whereby openings (15, 17) are provided which are aligned with respect to the optical components of the sensor unit and form an optical passage, and with an upper layer, which is connected to the upper contact surface of the lower layer in a way detachable from one another; and whereby the sensor unit is designed as a body stretched along a longitudinal axis, and whereby tabs are formed on the longitudinally stretched body of the sensor unit in the region of the optical components or the light detector device and the light coupling point, which tabs extend perpendicular to and/or along the longitudinal axis. ▪ the sensor configuration comprises a contact head, designed for electrical contacting of the sensor unit and for supply of light from a light source to the sensor unit, whereby the contact head is able to be received on the sensor unit and is connectible thereto, ▪ the sensor unit is designed as a flexible printed circuit board; with optical components, comprising at least one light detector device, in order to detect light that has been emitted from the contact head, received on and connected to the sensor unit, into the body tissue and has passed through the latter, and with a first contact means and conducting tracks for operative connection of the sensor unit to the contact head, with optical components, comprising at least one light detector device, in order to detect light that has been emitted from the contact head, received on and connected to the sensor unit, into the body tissue and has passed through the latter, and with a first contact means and conducting tracks for operative connection of the sensor unit to the contact head, ▪ and whereby the sensor mat has a multi-layered structure, with a lower layer, having a lower contact surface for contact on the body surface and an upper contact surface for support of the sensor unit, whereby openings (15, 17) are provided which are aligned with respect to the optical components of the sensor unit and form an optical passage, and with an upper layer, which is connected to the upper contact surface of the lower layer in a way detachable from one another; and whereby the sensor unit is designed as a body stretched along a longitudinal axis, and whereby tabs are formed on the longitudinally stretched body of the sensor unit in the region of the optical components or the light detector device and the light coupling point, which tabs extend perpendicular to and/or along the longitudinal axis. with a lower layer, having a lower contact surface for contact on the body surface and an upper contact surface for support of the sensor unit, whereby openings (15, 17) are provided which are aligned with respect to the optical components of the sensor unit and form an optical passage, and with an upper layer, which is connected to the upper contact surface of the lower layer in a way detachable from one another; and whereby the sensor unit is designed as a body stretched along a longitudinal axis, and whereby tabs are formed on the longitudinally stretched body of the sensor unit in the region of the optical components or the light detector device and the light coupling point, which tabs extend perpendicular to and/or along the longitudinal axis.