# US 2014/0197334 A1 · Ir spectrometry cell with temperature control means

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- Number: US 2014/0197334 A1
- Document ID: US20140197334A1
- Status: Published application
- Kind: A1
- Application number: 14/238,320
- Filed: 2012-08-03
- Published: 2014-07-17
- Earliest claimed: 2011-08-24
- Assignees: Delta Instruments B.V.
- Inventors: Anne Gerben Terpstra
- Web page: https://patentgrep.com/patent/US20140197334A1

## CPC

- G01J 3/0267: {Sample holders for colorimetry}
- G01J 3/28: Investigating the spectrum (using colour filters G01J3/51)
- G01N 21/0332: {with temperature control (control of temperature G05D23/00; cryostats F17C3/08)}
- G01N 21/05: Flow-through cuvettes (G01N21/09 takes precedence; handling fluid samples G01N1/10)
- G01N 21/3577: for analysing liquids, e.g. polluted water
- G01N 33/04: Dairy products
- G01N 2021/0346: {Capillary cells; Microcells}
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)
- 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)

## Abstract

A sample cell for IR spectrophotometric analysis of a liquid sample is provided. The sample cell comprises two substantially parallel transparent plates enclosing a cavity for holding the liquid sample, and a temperature control loop for controlling a temperature of the liquid sample in the cavity. The temperature control loop comprises at least one temperature sensor for measuring a temperature in or close to the cavity, at least one heating element for increasing a temperature of the liquid sample, and control means, coupled to the temperature sensor and the heating element for controlling the heating element in dependence of the temperature in or close to the cavity. The heating element comprises at least one heating foil which is attached to or thermally coupled to a first one of the transparent plates in such a way to allow an IR light beam to pass through the transparent plates and the cavity without being hindered by the heating foil.

## Claims

### Claim at position 1

1-7. (canceled)

### Claim 8

A sample cell (10) for IR spectrophotometric analysis of a liquid sample, the sample cell (10) comprising:
two substantially parallel transparent plates (11) enclosing a cavity (17) for holding the liquid sample,
a liquid supply channel (18) comprising a first part for pumping fresh liquid into the cavity (17) and a second part for pumping liquid out of the cavity (17), and
a temperature control loop for controlling a temperature of the liquid sample in the cavity (17), the temperature control loop comprising:
at least one temperature sensor (41) for measuring a temperature in or close to the cavity (17),
at least one heating element (12, 22, 32) for increasing a temperature of the liquid sample, and
control means, coupled to the temperature sensor (41) and the heating element (12, 22, 32) for controlling the heating element (12, 22, 32) in dependence of the temperature in or close to the cavity (17), wherein
the heating element (12, 22, 32) comprises at least one heating foil (12, 22, 32) which is attached to or thermally coupled to a first one of the transparent plates (11) in such a way to allow an IR light beam to pass through the transparent plates (11) and the cavity (17) without being hindered by the heating foil (12, 22, 32), wherein the heating foil (12, 22, 32) comprises the temperature sensor (41).

### Claim 9 (depends on 8)

A sample cell (10) as claimed in claim 8 further comprising a bypass channel (19) for providing a bypass from the first part of the supply channel (18) to the second part of the supply channel (18).

### Claim 10 (depends on 9)

A sample cell (10) as claimed in claim 9 further comprising a ring of a thermally conductive material is provided comprising the bypass channel (19).

### Claim 11 (depends on 10)

A sample cell (10) according to claim 10, wherein the thermally conductive material is a metal or steel.

### Claim 12 (depends on 9)

A sample cell (10) according to claim 9, wherein the bypass channel (19) is ring shaped.

### Claim 13 (depends on 8)

A sample cell (10) as claimed in claim 8, wherein the heating element (12, 22, 32) comprises a second foil (12, 22, 32) which is attached to or thermally coupled to a second one of the transparent plates (11).

### Claim 14 (depends on 11)

A sample cell (10) as claimed in claim 11, wherein the second foil is attached to the ring for heating the liquid in the bypass channel (19).

### Claim 15 (depends on 8)

A sample cell (10) as claimed in claim 8, wherein the heating foil (12, 22) is ring shaped.

### Claim 16 (depends on 8)

Use of a heating foil (12, 22, 32) in a sample cell (10) according to claim 8 for increasing a temperature of a liquid sample in the cavity (17), wherein the heating foil (12, 22) further comprises at least one temperature sensor (41).

### Claim 17 (depends on 16)

Use of a heating foil (12, 22) as claimed in claim 16, wherein the heating foil (12, 22) is ring shaped.

### Claim 18 (depends on 9)

Use of a heating foil (22) and use of a second heating foil (12) in a sample cell (10) according to claim 9 for, respectively, increasing a temperature of the liquid sample in the cavity (17) and heating the liquid in the bypass channel (19)