The principle of construction and a variant of the software and hardware implementation of the sensor system based on intra-fiber Bragg gratings (FBG) by the example of temperature measurement are proposed. The use of spectral-time separation of measuring channels, which takes into account the features of the functioning and placement of sensors based on FBGs, can significantly reduce the cost, dimensions, weight and power consumption of the interrogator, and neutralize the difficulties in setting up and periodic calibration typical for serial products. The test results of the system show the directions and prospects of using the developed equipment as part of portable and on-board monitoring and control systems.