Displacement sensor

A displacement sensor for repeatedly performing a detection process including projecting light onto an object and receiving light reflected from the object and a measurement process that measures an amount of displacement of the object based on the reception of the reflected light, and determines a moving average calculation of data of the measured amount, for outputting detection data based on an average value obtained by the moving average calculation, comprising:

• a register that registers a number of pieces of data of the moving average calculation;
• and
• a teaching mode processor that executes a teaching mode in which the number of pieces of data of the moving average calculation is registered with the register, wherein
• the teaching mode processor includes:
• a setting processor that executes the detection process and the measurement process, each for a plurality of times, and executes a process for setting a processing time of the detection process and a process of calculating a variation of measurement data obtained by the measurement process,
• a specifying processor that specifies a first function representing a relationship between a response time of the displacement sensor and the number of pieces of data of moving average calculation, based on a processing time of the detection process set by the setting processor, specifying a second function representing a relationship between an error of detection data and the number of pieces of data of the moving average calculation based on the variation of measurement data calculated by the setting processor, and for specifying, based on the first and second functions, at least one combination of the number of pieces of data of moving average, the response time corresponding to the number of pieces of data, and the error of detection data corresponding to the number of pieces of data, and
• a registration processor that displays the combination of response time and accuracy of detection data specified by the specifying means to be ready for a selection operation and, when any displayed combination is selected, that registers the number of pieces of data of moving average corresponding to the selected combination with the register.