Patent ID: 9157892
Filing Date: 2015-10-13
Classification: G01B,G01N

Abstract:
1. A surface property inspection device, comprising: an AC bridge circuit; an AC power supply for supplying AC power to the AC bridge circuit; and a judgment device for making a pass/fail judgment of the surface treatment condition of a sample under inspection based on the output signal from the AC bridge circuit; wherein the AC bridge circuit includes a variable resistor constituted so that the split ratio between a first resistor and a second resistor is variable, a benchmark detector having a first magnetic sensor for detecting the magnetic properties of a benchmark sample in a good surface treatment condition, and an inspection detector having a second magnetic sensor for detecting the magnetic properties of a sample under inspection for which a pass/fail inspection of the surface treatment condition is to be made; and the first resistor, the second resistor, the benchmark detector, and the inspection detector constitute a bridge circuit; and wherein the judgment device judges the pass/fail status of the surface treatment condition of the sample under inspection based on the output signal from the AC bridge circuit in a state in which AC power is supplied to the AC bridge circuit, the first magnetic sensor detects the magnetic properties of the benchmark sample, and the second magnetic sensor detects the magnetic properties of the sample under inspection.