US 12,235,399 B2
Energy measurement apparatus, energy computation apparatus, energy measurement method, and energy computation program
Yoshiharu Hiroshima, Musashino (JP); Hidenori Iwashita, Musashino (JP); and Yuichiro Okugawa, Musashino (JP)
Assigned to Nippon Telegraph and Telephone Corporation, Tokyo (JP)
Appl. No. 18/012,746
Filed by Nippon Telegraph and Telephone Corporation, Tokyo (JP)
PCT Filed Jun. 24, 2020, PCT No. PCT/JP2020/024819
§ 371(c)(1), (2) Date Dec. 23, 2022,
PCT Pub. No. WO2021/260845, PCT Pub. Date Dec. 30, 2021.
Prior Publication US 2023/0314640 A1, Oct. 5, 2023
Int. Cl. G01T 3/08 (2006.01); G01T 1/24 (2006.01)
CPC G01T 3/08 (2013.01) [G01T 1/247 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An energy measurement apparatus comprising:
a target that is irradiated with a particle to emit particle radiation;
an output circuit including a semiconductor element, the output circuit being configured to output voltage or current during normal operation;
a clocking unit configured to measure elapsed time with a point in time when the particle radiation is emitted from the target defined as a starting point;
a measurement unit configured to measure the voltage or the current output from the output circuit; and
a calculation unit configured to calculate time of flight of the particle radiation based on a time when a measurement value measured by the measurement unit falls below a predetermined threshold value and the elapsed time measured by the clocking unit, the calculation unit being configured to calculate energy of the particle radiation based on the calculated time of flight,
wherein the calculation unit calculates an approximate curve indicating a change in the voltage or the current measured by the measurement unit with respect to the elapsed time, and calculates the time of flight based on the approximate curve.