Degree of hardness measurement system and degree of hardness measurement method

摘要

For measuring hardness of an object, a measurement apparatus is pushed against the object and a degree of hardness calculation system calculates hardness based on information from the measurement apparatus. The measurement apparatus includes an acceleration sensor which outputs first information of acceleration of a contact area of the measurement apparatus, and a second sensor, such as a magnetic sensor or a pressure sensor, which outputs second information based on pressure applied to the contact area. The degree of hardness calculation system generates a second-derivative waveform by twice differentiating a waveform based on the output of the second sensor, compares the second-derivative waveform and the information of acceleration from the acceleration sensor, and calculates hardness of the object based on the comparison result.

主权项

1. A hardness measurement system for measuring hardness of an object, comprising:
a measurement apparatus disposed to be pushed against the object; and a degree of hardness calculation system coupled to said measurement apparatus and operative to calculate hardness based on information from said measurement apparatus; wherein said measurement apparatus includes: an acceleration sensor operative to output first information of acceleration of a contact area of said measurement apparatus toward said object; and a magnetic sensor operative to output second information as electric voltage based on magnitude of pressure applied to said contact area; and wherein said degree of hardness calculation system includes: a memory operative to store third information of a relationship between said electric voltage from said magnetic sensor and said magnitude of pressure; and a processing section configured to generate a 2nd derivative waveform by twice differentiating an electric voltage waveform based on said electric voltage output from said magnetic sensor, to compare said 2nd derivative waveform and said information of acceleration from said acceleration sensor, and to calculate hardness of said object based on a result of said comparison and said relationship information stored in said memory.