Mitutoyo Corporation

Ryunosuke Yano

Yusuke Shirakawa

Masanobu Kataoka

Tatsuya Narumi

Hidekazu Oozeki

A hardness tester includes an indenter, an arm and a driver which loads a test force onto the indenter and press the indenter against a sample, a spring displacement amount sensor detecting a value for the test force loaded onto the indenter, and a controller. In a state where a predetermined test force (total test force) is loaded onto the indenter by the driver, when the value of the test force detected by the spring displacement amount sensor exceeds a predefined allowable margin relative to the predetermined test force, the controller executes predetermined processes, including an interrupt process interrupting the test currently being executed and a notification process notifying a user that the value of the test force exceeded the allowable margin during execution of the test.

Hardness tester and program

A laser-frequency stabilizer includes: a light detector that converts a laser beam passing through an iodine cell to an optical output signal, an actuator that changes a resonator length in accordance with a received output voltage, and a control unit that controls the output voltage applied to the actuator. The control unit searches for a target saturated absorption line based on the optical output signal and, when the output voltage when the target saturated absorption line is found is within a normal voltage range that is predetermined corresponding to the target saturated absorption line, locks a oscillation frequency of the laser beam to the target saturated absorption line.

Laser-frequency stabilizer and laser-frequency stabilization method

A laser light generator emits laser light, a frequency of which can be adjusted. A laser light detector bombards an iodine cell with the laser light and photoelectrically converts the laser light that has passed through the iodine cell, then outputs a light output signal. A third order differential lock-in amplifier generates a third order differential signal of the light output signal. A frequency locker causes the laser light generator to change the frequency of the laser light within a predetermined range, detects an amplitude corresponding to a saturated absorption line occurring in the third order differential signal, and causes the frequency of the laser light to stabilize to a predetermined value. An error detector outputs an error signal in a case where the amplitude corresponding to the saturated absorption line occurring in the third order differential signal is greater than a predetermined value.

Growing community of inventors

Miyazaki, Japan

Ryunosuke Yano