# US 2014/0360250 A1 · Gas exchange system flow configuration with thermally insulated sample chamber

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- Number: US 2014/0360250 A1
- Document ID: US20140360250A1
- Status: Published application
- Kind: A1
- Application number: 14/247,102
- Filed: 2014-04-07
- Published: 2014-12-11
- Earliest claimed: 2010-09-23
- Assignees: LI-COR, Inc.
- Inventors: Mark A. JOHNSON; Andrew S. Parr; Robert D. Eckles
- Web page: https://patentgrep.com/patent/US20140360250A1

## CPC

- G01N 33/0009: {General constructional details of gas analysers, e.g. portable test equipment (devices for withdrawing samples in the gaseous state G01N1/22)}
- B33Y 70/10: Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
- G01N 21/05: Flow-through cuvettes (G01N21/09 takes precedence; handling fluid samples G01N1/10)
- G01N 21/3504: for analysing gases, e.g. multi-gas analysis
- G01N 33/0098: {Plants or trees (wood G01N33/46)}
- B33Y 80/00: Products made by additive manufacturing
- G01N 33/004: {CO or CO2}
- G01N 2021/8466: {Investigation of vegetal material, e.g. leaves, plants, fruits}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING

## Abstract

System flow path, designs that minimize the impact of gas diffusion sources and sinks. By reducing the magnitude of parasitic sources and sinks, lower rates of photosynthesis and transpiration can be more accurately measured, e.g., without the need for extensive empirical compensation. According to one aspect, a gas exchange analysis system includes a sample chamber defining a measurement volume for analysis of a sample, the sample chamber having an inlet and an outlet, wherein the internal surface(s) of the chamber defining the measurement volume are metal plated. The system also typically includes a source of gas coupled with the inlet of the sample chamber, and a gas analyzer coupled with the outlet of the sample chamber and configured to measure a concentration of one or more gases exiting the chamber, whereby the metal plated internal surface(s) of the chamber reduces sorption of the one or more gases within the chamber. The low thermal conductivity of the chamber substrate material provides an energy efficient means of sample temperature control. The low density of the chamber substrate material reduces chamber weight for improved portability and ergonomics.”

## Claims

### Claim 1

A gas exchange analysis system, comprising:
a sample chamber defining a measurement volume for analysis of a sample, the sample chamber having an inlet and an outlet, wherein the internal surface(s) of the chamber defining the measurement volume are nickel plated;
a source of gas coupled with the inlet of the sample chamber:
a gas analyzer coupled with the outlet of the sample chamber and configured to measure a concentration of one or more gases exiting the chamber:
whereby the nickel plated internal surface(s) of the chamber reduces sorption of the one or more gases within the chamber.

### Claim 2 (depends on 1)

The system of claim 1, wherein the source of gas includes a gas conduit coupled with a gas reservoir.

### Claim 3

The system of claim. 2, wherein the reservoir is located remote from the sample chamber.

### Claim 4 (depends on 1)

The system of claim 1, wherein the nickel plated internal surface(s) are formed using electroless nickel, plating on the internal surface(s).

### Claim 5 (depends on 1)

The system, of claim 1, wherein the internal surface(s) of the chamber comprises a plastic material.

### Claim 6 (depends on 1)

The system of claim 1, wherein the plastic material is selected from the group consisting of nylon, glass-filled nylon and Acrylonitrile Butadiene Styrene (ABS).

### Claim 7 (depends on 1)

The system of claim 1, wherein the Internal surface(s) of the chamber comprises aluminum.

### Claim 8 (depends on 1)

The system of claim 1, wherein said one or more gases measured by the gas analyzer includes CO2 and H2O.

### Claim 9 (depends on 1)

The system of claim 1, wherein the gas analyzer includes an Infra-Red Gas Analyzer (IRGA).

### Claim 10 (depends on 1)

The system of claim 1, wherein the internal surface of the chamber comprises a fiberglass reinforced laminated composite.

### Claim 11 (depends on 1)

The system of claim 1 wherein the sample includes one of a leaf, a whole plant, a conifer or soil.