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In order to improve optical measurement precision of tooth profile form deviation, a high resolution line spectral confocal method was used. Aiming at the problem that tooth profile information contained in optical measurement results and traditional contact measurement results are inconsistent and couldn't be directly compared, A form feature data filtering method of virtual probe envelope contact points was proposed. This method simulated filtering method of contact probe to filter optical tooth profile data and extract macroscopic form feature data. In order to calculate tooth profile deviation along expanded length direction, firstly, the iterative nearest point method was used to register extracted tooth profile with theoretical involute profile in gear coordinate system to achieve coordinate conversion, and then the deviation value was calculated. In the experiment, the profile form deviation of gear involute master was measured by line spectral confocal method, and compared with verification results of contact method. The results showed that the measured tooth profile data filtered by the proposed envelope filtering method could be directly compared with the results of the contact method. The average value of optical measurement results of tooth profile deviation was 1.07 μm, which was consistent with verification results, and the maximum difference between them was 0.12 μm. Moreover, the form change of tooth profile deviation curve was highly consistent with that of verification curve, which verified the effectiveness of proposed method.
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