US 2013/0094027 A1Published application

Observation device

AssigneeHamamatsu Photonics K.K.

InventorsHidenao Iwai, Masatoshi Fujimoto

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Abstract

Provided is an observation device which can obtain a phase image of a moving object rapidly with high sensitivity even when using a photodetector having a slow read-out speed per pixel. The observation device 1 comprises a light source 10, a first modulator 20, a second modulator 30, a lens 40, a beam splitter 41, a photodetector 46, and an arithmetic unit 50. The lens 40 receives scattered light generated by a moving object 2 and forms a Fourier transform image of the object 2. The photodetector 46 outputs data representing a sum in a v direction of data temporally changing at a frequency corresponding to a Doppler shift frequency of the light having reached each position on a light-receiving surface through the lens 40 at each position in a u direction at each time. The arithmetic unit 50 obtains an image of the object 2 according to the output of the photodetector 46.

Claims28

Dependent claims

An observation device comprising:
a light source for irradiating a moving object with light;
a detection unit, letting a first direction be a direction on a predetermined plane yielding a fixed Doppler shift effect caused by a movement of the object in light having reached the predetermined plane in scattered light generated by the object upon irradiation with the light by the light source while being perpendicular to a moving direction of the object and a second direction be a direction orthogonal to the first direction on the predetermined plane while being parallel to the moving direction of the object, for outputting data representing a sum in the second direction of data temporally changing at a frequency corresponding to a Doppler shift frequency of the light having reached each position on the predetermined plane at each position in the first direction at each time;
and
an arithmetic unit for performing a one-dimensional Fourier transform of data employing the position in the first direction on the predetermined plane and time as variables with respect to a time variable and a two-dimensional Fourier transform of the Fourier-transformed data, so as to yield data obtained by a two-dimensional Fourier transform as an image of the object;
wherein the detection unit includes:
an optical system for receiving a light emitted from the light source and splitting the received light in two behind of the object so as to yield first light and second light, modulating the second light with a modulator, and then causing a heterodyne interference between the first light and the modulated second light on the predetermined plane;
and
a photodetector having a light-receiving surface on the predetermined plane and a pixel array structure in the first direction on the light-receiving surface.

6 more elements

An observation device according to claim 1, wherein the arithmetic unit comprises:

a first Fourier transform device for performing a one-dimensional Fourier transform with respect to the time variable;
and
a second Fourier transform unit for performing the two-dimensional Fourier transform;
and
wherein the second Fourier transform unit comprises a third Fourier transform device for performing a one-dimensional Fourier transform with respect to a frequency and a fourth Fourier transform device for performing a one-dimensional Fourier transform with respect to the first direction.

2 more elements

An observation device comprising:

a light source for irradiating a moving object with light;
a detection unit, letting a first direction be a direction on a predetermined plane yielding a fixed Doppler shift effect caused by a movement of the object in light having reached the predetermined plane in scattered light generated by the object upon irradiation with the light by the light source while being perpendicular to a moving direction of the object and a second direction be a direction orthogonal to the first direction on the predetermined plane while being parallel to the moving direction of the object, for outputting data representing a sum in the second direction of data temporally changing at a frequency corresponding to a Doppler shift frequency of the light having reached each position on the predetermined plane at each position in the first direction at each time;
and
an arithmetic unit for performing, for data employing a position in the first direction on the predetermined plane and time as variables, a one-dimensional Fourier transform with respect to a time variable, a one-dimensional Fourier transform with respect to the frequency, and a one-dimensional Fourier transform with respect to the first direction, so as to yield data obtained by a one-dimensional Fourier transforms as an image of the object;
wherein the detection unit includes:
an optical system for receiving a light emitted from the light source and splitting the received light in two behind of the object so as to yield first light and second light, modulating the second light with a modulator, and then causing a heterodyne interference between the first light and the modulated second light on the predetermined plane;
and
a photodetector having a light receiving surface on the predetermined plane and a pixel array structure in the first direction on the light-receiving surface.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/695,330Filed 2 May 2011
Priority: JP 2010-10567130 Apr 2010
Published: 18 Apr 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

G01B 9/02045
Characterised by particular imaging or detection techniques: using the Doppler effect
G01N 21/41
Systems in which incident light is modified in accordance with the properties of the material investigated: refractivity; Phase-affecting…
G02B 21/14
Condensers: affording illumination for phase-contrast observation
G02B 27/52
Optics for phase object visualisation: phase contrast optics

Family

US 9,134,109 B2Related patent
US 2013/0094027 A1This patent

From the US filing history. Foreign family members aren’t listed.

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