Particle detection device and a method for detecting airborne particles
AssigneeNederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO
InventorArjen Boersma
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Abstract
The invention relates to a particle detection device and a method for detecting particles in a fluid by means of separation. A channel structure is arranged for separating an incoming flow into a major flow comprising a minor portion of particles above the first predetermined size and a minor flow comprising a major portion of particles above the predetermined size. One or more detectors are arranged for detecting particles in the major flow and minor flow. The channel structure further comprises a choked flow restriction arranged for enabling a constant flow independent of pressure conditions.
Claims20
A particle detection device, including a channel structure arranged for detecting airborne particles in a fluid stream by separation, wherein the channel structure forms a fluid flow passage extending from an inlet to an outlet, and the fluid flow passage comprises a plurality of flow channels arranged between an inlet flow channel connected to the inlet and an outlet flow channel connected to the outlet;
- wherein the particle detection device is connectable to a receiving device comprising a pump or fan for enabling a fluid stream to flow through the fluid flow passage of the channel structure;
- wherein the inlet flow channel extends from the inlet to a first separation portion arranged for branching off the inlet flow channel into at least one main flow channel and at least one side flow channel, wherein the first separation portion is arranged to separate the fluid stream into a minor flow in the at least one main flow channel and a major flow in the at least one side flow channel, the minor flow in the at least one main flow channel comprises a major portion of particles above a first predetermined size, and the major flow in the at least one side flow channel comprises a minor portion of particles above the first predetermined size;
- wherein at least one of the at least one main flow channel or at least one side flow channel comprises one or more detectors arranged for detecting particles;
- and
- wherein the at least one of the plurality of flow channels includes a choked flow restriction configured to provide a choked flow, in use, for enabling a constant flow in the fluid flow passage, independent of pressure conditions.
A particle detection system comprising:
- one or more particle detection devices, wherein ones of the particle detection devices include:
- a channel structure arranged for detecting airborne particles in a fluid stream by separation, wherein the channel structure forms a fluid flow passage extending from an inlet to an outlet, and the fluid flow passage comprises a plurality of flow channels arranged between an inlet flow channel connected to the inlet and an outlet flow channel connected to the outlet;
- wherein the particle detection device is connectable to a receiving device comprising a pump or fan for enabling a fluid stream to flow through the fluid flow passage of the channel structure;
- wherein the inlet flow channel extends from the inlet to a first separation portion arranged for branching off the inlet flow channel into at least one main flow channel and at least one side flow channel, wherein the first separation portion is arranged to separate the fluid stream into a minor flow in the at least one main flow channel and a major flow in the at least one side flow channel, the minor flow in the at least one main flow channel comprises a major portion of particles above a first predetermined size, and the major flow in the at least one side flow channel comprises a minor portion of particles above the first predetermined size;
- wherein at least one of the at least one main flow channel or at least one side flow channel comprises one or more detectors arranged for detecting particles;
- and
- wherein the at least one of the plurality of flow channels includes a choked flow restriction configured to provide a choked flow, in use, for enabling a constant flow in the fluid flow passage, independent of pressure conditions;
- and
- a reading device,
- wherein the one or more particle detection devices are removably connected to the reading device.
A method for detecting airborne particles in a fluid stream by separation obtained by using a channel structure forming a fluid flow passage extending from an inlet to an outlet, and the fluid flow passage comprises a plurality of flow channels arranged between an inlet flow channel connected to the inlet and the outlet flow channel connected to the outlet, wherein the channel structure is connectable to a receiving device comprising a pump or fan for enabling a fluid stream to flow through the fluid flow passage of the channel structure;
- method comprising:
- providing a first separation portion for branching off the inlet flow channel into at least one main flow channel and at least one side flow channel such as to separate the fluid stream into a minor flow in the at least one main flow channel and a major flow in the at least one side flow channel, the minor flow in the at least one main flow channel comprises a major portion of particles above a first predetermined size, and the major flow in the at least one side flow channel comprises a minor portion of particles above the first predetermined size;
- providing one or more detectors in at least one of the at least one main flow channel or at least one side flow channel for detecting particles;
- and
- providing in the at least one of the plurality of flow channels a choked flow restriction arranged to provide a choked flow, in use, for enabling a constant flow independent of pressure conditions.
Dependencies are inferred from the claim text.