Abstract: The present disclosure provides a near-eye display system for generating a virtual image of a display, including: a display, a first lens array comprising a plurality of concave microlenses having a first pitch, and a second lens array positioned in front of the first lens array, the second lens array comprising a plurality of convex microlenses having a second pitch, wherein the first lens array is positioned on an optical path between the display and the second lens array, and wherein the first lens array has a focal plane at the display and the second lens array has a focal plane at a virtual image plane of the first lens array.

Abstract: An apparatus for inserting a microneedle into tissue. The apparatus comprises microneedle supported by a backing to move therewith and a forcer that is selectably operable between a retracted state and an extended state. Upon operation of the forcer from the retracted state to the extended state, the forcer applies force to the backing which causes the backing to travel in an insertion direction toward the tissue. A releasable locking mechanism which, in a locking state, permits one-way motion of the backing in the insertion direction toward the tissue and lockingly engages the backing to prevent motion of the backing in a reverse direction opposed to the insertion direction, the releasable locking mechanism releasable, to a released state, which permits motion of the backing in the reverse direction.

Abstract: Methods for fabricating metallic microneedles are disclosed. One method comprises providing a mold pillar; forming an apertured electrically-conductive layer over the mold pillar; and depositing a metal layer over the electrically-conductive layer to provide an apertured microneedle. Another method comprises providing a mold pillar; depositing a first metal layer over the mold pillar to provide a first microneedle; removing the first microneedle from the mold pillar; and depositing a second metal layer over the mold pillar to provide a second microneedle.

Abstract: Methods and apparatus for supporting microneedles are provided. The apparatus includes a plurality of pedestals extending away from a base and transversely spaced-apart from each other by inter-pedestal volumes. Each of the pedestals has a transversely extending contact surface. For each of the pedestals, one or more microneedles extend from the contact surface of the pedestal.

Abstract: An apparatus for monitoring particulate matter includes a fluid flow passage. Some embodiments include a cartridge defining a part of the fluid flow passage extending from a cartridge inlet to a cartridge outlet and a particle size selector in the fluid-flow passage between the cartridge inlet and the cartridge outlet. The particle size selector comprises a curve section in the fluid flow passage where the flow of fluid undergoes a change in direction and an impact surface extending transversely to the fluid flow passage on an outside of the curve. A particle counter is located downstream from the particle size selector. A pump is connected to drive a flow of a fluid containing the particulate matter through the fluid flow passage. The apparatus may be made compact. Embodiments may be worn and used to monitor exposure of persons to particulate matter.

Abstract: The present disclosure provides a near-eye display system for generating a virtual image of a display, including: a display, a first lens array comprising a plurality of concave microlenses having a first pitch, and a second lens array positioned in front of the first lens array, the second lens array comprising a plurality of convex microlenses having a second pitch, wherein the first lens array is positioned on an optical path between the display and the second lens array, and wherein the first lens array has a focal plane at the display and the second lens array has a focal plane at a virtual image plane of the first lens array.

Abstract: Methods for fabricating metallic microneedles are disclosed. One method comprises providing a mold pillar; forming an apertured electrically-conductive layer over the mold pillar; and depositing a metal layer over the electrically-conductive layer to provide an apertured microneedle. Another method comprises providing a mold pillar; depositing a first metal layer over the mold pillar to provide a first microneedle; removing the first microneedle from the mold pillar; and depositing a second metal layer over the mold pillar to provide a second microneedle.

Abstract: The present disclosure provides a near-eye display system for generating a virtual image of a display, including: a display, a first lens array comprising a plurality of concave microlenses having a first pitch, and a second lens array positioned in front of the first lens array, the second lens array comprising a plurality of convex microlenses having a second pitch, wherein the first lens array is positioned on an optical path between the display and the second lens array, and wherein the first lens array has a focal plane at the display and the second lens array has a focal plane at a virtual image plane of the first lens array.

Abstract: Methods for fabricating metallic microneedles are disclosed. One method comprises providing a mold pillar; forming an apertured electrically-conductive layer over the mold pillar; and depositing a metal layer over the electrically-conductive layer to provide an apertured microneedle. Another method comprises providing a mold pillar; depositing a first metal layer over the mold pillar to provide a first microneedle; removing the first microneedle from the mold pillar; and depositing a second metal layer over the mold pillar to provide a second microneedle.

Abstract: An apparatus for monitoring particulate matter includes a fluid flow passage. Some embodiments include a cartridge defining a part of the fluid flow passage extending from a cartridge inlet to a cartridge outlet and a particle size selector in the fluid-flow passage between the cartridge inlet and the cartridge outlet. The particle size selector comprises a curve section in the fluid flow passage where the flow of fluid undergoes a change in direction and an impact surface extending transversely to the fluid flow passage on an outside of the curve. A particle counter is located downstream from the particle size selector. A pump is connected to drive a flow of a fluid containing the particulate matter through the fluid flow passage. The apparatus may be made compact. Embodiments may be worn and used to monitor exposure of persons to particulate matter.

Abstract: Methods for fabricating metallic microneedles are disclosed. One method comprises providing a mold pillar; forming an apertured electrically-conductive layer over the mold pillar; and depositing a metal layer over the electrically-conductive layer to provide an apertured microneedle. Another method comprises providing a mold pillar; depositing a first metal layer over the mold pillar to provide a first microneedle; removing the first microneedle from the mold pillar; and depositing a second metal layer over the mold pillar to provide a second microneedle.

Abstract: The present disclosure provides a near-eye display system for generating a virtual image of a display, including: a display, a first lens array comprising a plurality of concave microlenses having a first pitch, and a second lens array positioned in front of the first lens array, the second lens array comprising a plurality of convex microlenses having a second pitch, wherein the first lens array is positioned on an optical path between the display and the second lens array, and wherein the first lens array has a focal plane at the display and the second lens array has a focal plane at a virtual image plane of the first lens array.

Abstract: Methods for fabricating metallic microneedles are disclosed. One method comprises providing a mold pillar; forming an apertured electrically-conductive layer over the mold pillar; and depositing a metal layer over the electrically-conductive layer to provide an apertured microneedle. Another method comprises providing a mold pillar; depositing a first metal layer over the mold pillar to provide a first microneedle; removing the first microneedle from the mold pillar; and depositing a second metal layer over the mold pillar to provide a second microneedle.

Abstract: Apparatus and methods for size-specific detection of particles entrained in fluids are provided. A particle size selector separates particles entrained in a sample fluid stream using a curved channel. Shroud fluid streams are interposed between the sample fluid stream and walls of the channel. Centrifugal forces arising from fluid flow through the curved channel separate differently-sized particles into different transverse sections of the channel. A detector downstream from the particle size selector specifically detects particles in one or more transverse sections of the channel.

Abstract: Methods for fabricating metallic microneedles are disclosed. One method comprises providing a mold pillar; forming an apertured electrically-conductive layer over the mold pillar; and depositing a metal layer over the electrically-conductive layer to provide an apertured microneedle. Another method comprises providing a mold pillar; depositing a first metal layer over the mold pillar to provide a first microneedle; removing the first microneedle from the mold pillar; and depositing a second metal layer over the mold pillar to provide a second microneedle.

Abstract: Apparatus and methods for size-specific detection of particles entrained in fluids are provided. A particle size selector separates particles entrained in a sample fluid stream using a curved channel. Shroud fluid streams are interposed between the sample fluid stream and walls of the channel. Centrifugal forces arising from fluid flow through the curved channel separate differently-sized particles into different transverse sections of the channel. A detector downstream from the particle size selector specifically detects particles in one or more transverse sections of the channel.

Abstract: A method and apparatus for substance monitoring. One application is an easy to handle continuous glucose monitor using a group of hollow out-of-plane silicon microneedles to sample substances in interstitial fluid from the epidermal skin layer. The glucose of the interstitial fluid permeates a dialysis membrane and reaches a sensor. Using MEMS technology, for example, allows well-established batch fabrication at low cost.

Abstract: A method and apparatus for substance monitoring. One application is an easy to handle continuous glucose monitor using a group of hollow out-of-plane silicon microneedles to sample substances in interstitial fluid from the epidermal skin layer. The glucose of the interstitial fluid permeates a dialysis membrane and reaches a sensor. Using MEMS technology, for example, allows well-established batch fabrication at low cost.

Abstract: A method and apparatus for substance monitoring. One application is an easy to handle continuous glucose monitor using a group of hollow out-of-plane silicon microneedles to sample substances in interstitial fluid from the epidermal skin layer. The glucose of the interstitial fluid permeates a dialysis membrane and reaches a sensor. Using MEMS technology, for example, allows well-established batch fabrication at low cost.

Abstract: A method and apparatus for substance monitoring. One application is an easy to handle continuous glucose monitor using a group of hollow out-of-plane silicon microneedles to sample substances in interstitial fluid from the epidermal skin layer. The glucose of the interstitial fluid permeates a dialysis membrane and reaches a sensor. Using MEMS technology, for example, allows well-established batch fabrication at low cost.