公开(公告)号：US20250016476A1

公开(公告)日：2025-01-09

申请号：US18709973

申请日：2022-11-10

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Takafumi HIGUCHI ,  Katsuhiro NAKAMOTO ,  Teruo TAKAHASHI ,  Mao NAKAJIMA

IPC: H04N25/773 ,  G01J1/44 ,  H04N25/618

Abstract: A threshold value determination method includes a step of calculating a probability distribution of a provisional value for each photon number of a target pixel based on an observation probability for each photoelectron number based on a probability distribution of the photon number and an observation probability for each photoelectron number based on a probability distribution of the photoelectron number accompanying reading noise of the target pixel and a step of calculating threshold value data for sorting the provisional value into a corresponding photon number based on the probability distribution for each photon number.

公开(公告)号：US20240361375A1

公开(公告)日：2024-10-31

申请号：US18683921

申请日：2022-07-29

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Katsuhiro NAKAMOTO ,  Hisaya HOTAKA

IPC: G01R31/26

CPC classification number: G01R31/2635

Abstract: An estimation device for estimating a conversion factor which is a ratio between the number of photoelectrons generated from a pixel in response to inputting of light to the pixel and an electrical signal intensity output in response to the number of photoelectrons is provided. The estimation device includes: an acquisition unit configured to acquire a plurality of data groups including the electrical signal intensity for each of a plurality of pixels when light is input to the plurality of pixels; and a calculation unit configured to calculate the conversion factor for each of the plurality of pixels from the plurality of data groups based on a likelihood function indicating a likelihood of the conversion factor corresponding to the output electrical signal intensity.

公开(公告)号：US20250016475A1

公开(公告)日：2025-01-09

申请号：US18709905

申请日：2022-11-10

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Takafumi HIGUCHI ,  Teruo TAKAHASHI ,  Mao NAKAJIMA ,  Katsuhiro NAKAMOTO

IPC: H04N25/773 ,  H04N25/616 ,  H04N25/778

Abstract: A photon number resolving system includes: a plurality of pixels of which each includes a photoelectric conversion element and an amplifier for amplifying the electric charges converted by the photoelectric conversion element and converting the electric charges to a voltage; an A/D converter configured to convert a voltage output from the amplifier of each of the plurality of pixels to a digital value; a first deriving unit configured to derive a provisional value of a photon number in each pixel of the plurality of pixels based on the digital value; and a second deriving unit configured to derive a confirmed value of a photon number in a target pixel based on a first probability based on optical shot noise and a second probability based on reading noise.

公开(公告)号：US20240314470A1

公开(公告)日：2024-09-19

申请号：US18275443

申请日：2021-12-24

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Takafumi HIGUCHI ,  Teruo TAKAHASHI ,  Mao NAKAJIMA ,  Katsuhiro NAKAMOTO

IPC: H04N25/773 ,  G01J1/44 ,  H04N25/618

CPC classification number: H04N25/773 ,  G01J1/44 ,  H04N25/618 ,  G01J2001/442

Abstract: A photon counting device includes: a plurality of pixels each including a photoelectric conversion element and an amplifier amplifying charge to which input light is converted by the photoelectric conversion element and converting the amplified charge to a voltage; an A/D converter converting a voltage output from the amplifier of each of the plurality of pixels to a digital value; a first derivation unit configured to derive a provisional value of photon number in each of the plurality of pixels based on the digital value; and a second derivation unit configured to derive a confirmed value of photon number in a target pixel based on a first probability associated with a photon number distribution and a second probability associated with reading noise.

公开(公告)号：US20220397752A1

公开(公告)日：2022-12-15

申请号：US17779283

申请日：2020-12-07

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Katsuhiro NAKAMOTO

IPC: G02B21/06 ,  H04N5/232

Abstract: An imaging apparatus includes a light source, a spatial light modulator, a Fourier transform optical system, a photodetector, and a control unit. The control unit sets a first region and a second region on a modulation plane of the spatial light modulator, sequentially sets a plurality of light phase modulation patterns in the first region, sequentially sets a plurality of uniform phase shifts in a region other than the first region when setting each light phase modulation pattern in the first region to acquire a light intensity value, and acquires a phase image of a region of an object corresponding to the first region using a phase shift method.

公开(公告)号：US20240305907A1

公开(公告)日：2024-09-12

申请号：US18272611

申请日：2022-01-13

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Keisuke UCHIDA ,  Munenori TAKUMI ,  Hisayoshi TAKAMOTO ,  Naoaki KATO ,  Katsuhiro NAKAMOTO ,  Mitsuhito MASE

IPC: H04N25/705 ,  G01S7/4863 ,  G01S7/4865 ,  H04N25/771

CPC classification number: H04N25/705 ,  G01S7/4863 ,  G01S7/4865 ,  H04N25/771

Abstract: A distance image acquisition apparatus includes a light source, an irradiation optical system, an imaging optical system, an imaging element, and a processing unit. The imaging element receives a light pulse output from the light source, reflected by an object, and passed through the imaging optical system on a light receiving surface. Each of a plurality of pixels on the light receiving surface includes a photodiode for generating charges by receiving light, and a charge accumulation portion for accumulating the charges generated in the photodiode. The processing unit commonly applies a control pattern to the plurality of pixels. The control pattern indicates a period in which the charges generated in the photodiode are accumulated in the charge accumulation portion. The processing unit acquires a distance image of the object based on an amount of charges generated in the photodiode and accumulated in the charge accumulation portion.

公开(公告)号：US20240241065A1

公开(公告)日：2024-07-18

申请号：US18576150

申请日：2022-06-30

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Takahiro MOCHIZUKI ,  Katsuhiro NAKAMOTO

IPC: G01N23/083

CPC classification number: G01N23/083 ,  G01N2223/1003

Abstract: An element distribution measurement apparatus is an apparatus for measuring a distribution of a content rate of each element contained in a measurement sample, and includes a measurement unit and an operation unit. The measurement unit acquires projection data by making rays of radiation of each of a plurality of spectra incident on the measurement sample. The operation unit obtains the distribution of the content rate of each element based on a distribution of a linear attenuation coefficient of the measurement sample obtained for each of the spectra based on the projection data, and a formula of the linear attenuation coefficient represented by using a value of a mass attenuation coefficient of each element, a value of an atomic weight of each element, a variable of the content rate of each element, and a variable of a density of the measurement sample for each of the spectra.

公开(公告)号：US20220417407A1

公开(公告)日：2022-12-29

申请号：US17778185

申请日：2020-12-07

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Katsuhiro NAKAMOTO

IPC: H04N5/235

Abstract: An imaging apparatus includes a light source, a spatial light modulator, a Fourier transform optical system, a photodetector, and a control unit. The control unit sets a first region and a second region on a modulation plane, acquires a light intensity value by setting a light amplitude modulation pattern in the first region and setting a light amplitude modulation in the second region to a non-zero predetermined value, acquires the light intensity value by setting the light amplitude modulation pattern in the first region and setting the light amplitude modulation in the second region to zero, acquires the light intensity value by setting the light amplitude modulation in the first region to zero and setting the light amplitude modulation in the second region to the predetermined value, and acquires a complex amplitude image of a region of an object corresponding to the first region.