Agricultural sampling system and related methods
An automated computer-controlled sampling system and related methods for collecting, processing, and analyzing agricultural samples for various chemical properties such as plant available nutrients. The sampling system allows multiple samples to be processed and analyzed for different analytes or chemical properties in a simultaneous concurrent or semi-concurrent manner. Advantageously, the system can process soil samples in the “as collected” condition without drying or grinding to produce a sample slurry. The system includes a chemical analysis sub-system which processes and analyzes the prepared slurry for quantifying multiple analytes and/or chemical properties of the sample. The chemical analysis sub-system may be embodied in a multi-layered microfluidic manifold processing substrate comprising microfluidic devices which extract and quantify the concentration of analytes or other chemical parameters associated with the sample. The system can be used to analyze various type of agricultural-related samples including soil, vegetation, manure, milk or other.
1. A microfluidic manifold for processing an agricultural slurry comprising:
a micropump formed between a liquid layer and an air layer of the manifold, the micropump comprising a pump chamber collectively formed by an air-side recess and a liquid-side recess, and a resiliently deformable diaphragm separating the air-side and liquid-side recesses;
the liquid layer further comprising a perimeter flow groove extending circumferentially around peripheral portions of the pump chamber.
2. The microfluidic manifold according to claim 1 , wherein the perimeter flow groove extends circumferentially around the liquid-side recess and is recessed into a top surface of the liquid layer.
3. The microfluidic manifold according to claim 1 , wherein the diaphragm is formed of fluorosilicone.
4. The microfluidic manifold according to claim 1 , wherein the perimeter flow groove intersects and is fluidly coupled to a fluid inlet port and fluid outlet port of the micropump.
5. The microfluidic manifold according to claim 1 , wherein the air-side recess has a domed shape wall and the liquid-side recess has a flat shaped wall.
6. The microfluidic manifold according to claim 1 , wherein the microfluidic manifold comprises a block shaped substrate, the liquid and air layers being formed internally within the substrate.
7. The microfluidic manifold according to claim 1 , wherein the liquid-side recess comprises a plurality of anti-stall grooves recessed into the liquid layer.
8. The microfluidic manifold according to claim 7 , wherein the anti-stall grooves are arranged in an orthogonally intersecting grid array.
9. The microfluidic manifold according to claim 7 , wherein the anti-stall grooves intersect the perimeter flow groove.
10. The microfluidic manifold according to any one of claims 7-9 , wherein the air-side recess comprises a plurality of intersecting anti-stall grooves recessed into the air layer.
11. The microfluidic manifold according to claim 1 , wherein the perimeter flow groove is spaced inwards from a circumferentially-extending peripheral sidewall of the liquid-side recess.
12. The microfluidic manifold according claim 11 , further comprising a protruding diaphragm seal ring disposed adjacent to the perimeter flow groove.
13. The microfluidic manifold according to claim 12 , wherein the seal ring is disposed between the peripheral sidewall of the liquid-side recess and the perimeter flow groove.
14. The microfluidic manifold according to claim 13 , further comprising a diaphragm sealing pocket defined by the liquid-side recess which is formed between the seal ring and the peripheral sidewall of the liquid-side pump chamber.
15. The microfluidic manifold according to claim 12 , wherein the seal ring extends circumferentially around and outboard of the flow groove.
16. The microfluidic manifold according to claim 15 , wherein the seal ring is configured to prevent ingress of the diaphragm into the perimeter flow groove when the liquid layer is bonded to the air layer.
17. The microfluidic manifold according to claim 16 , wherein the seal ring has a wider base than a terminal top end portion.
18. The microfluidic manifold according to claim 17 , wherein the seal ring comprises one or two obliquely angled surfaces at the top end portion forming a cross-sectional profile which is narrower than the base.
19. The microfluidic manifold according to claim 17 , wherein the seal ring has a trapezoidal or partial trapezoidal cross-sectional shape.