Patent ID: 11920998
Assignee: PARIS SCIENCES ET LETTRES
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. Use of the method according to claim 8, in which a microfluidic or millifluidic chip comprising: a microfluidic circuit with an embedded flow channel through which a fluid circulates and along which the fluid flow pressure is to be measured, and at least one integrated pressure sensing unit able to measure the fluid flow pressure at a position along said main flow channel, said microfluidic chip being characterized in that it comprises two layers made of a liquid-tight material and a membrane, wherein one at least of said two layers is made of a material that is also light transparent, wherein said membrane is impermeable to the fluid circulating in the channel and is able to deform under the pressure exerted by the fluid, said layers and said membrane being arranged according to the following configuration: one layer is a top layer in which the main flow channel is embedded at a surface of the top layer facing another layer is a bottom layer comprising one lower cavity formed at its surface and containing a slab of a photonic hydrogel immersed in a aqueous buffer solution wherein said lower cavity is positioned so as to be placed directly under the main flow channel, wherein said lower cavity containing the photonic gel and the part of the membrane covering said lower cavity form the sensing unit is used for measuring a static pressure as low as 2 kPa with a resolution below 50 Pa.