GB2504976A - Optical cell with two compartments - Google Patents
Optical cell with two compartments Download PDFInfo
- Publication number
- GB2504976A GB2504976A GB201214618A GB201214618A GB2504976A GB 2504976 A GB2504976 A GB 2504976A GB 201214618 A GB201214618 A GB 201214618A GB 201214618 A GB201214618 A GB 201214618A GB 2504976 A GB2504976 A GB 2504976A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cell
- walls
- wall
- incident
- exit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000003287 optical effect Effects 0.000 title description 3
- 239000012925 reference material Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 description 15
- 239000010453 quartz Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/0223—Sample holders for photometry
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optical Measuring Cells (AREA)
Abstract
A cell usable in a cell holder in a photometer, which cell is formed by an incident wall 1 and an exit wall 2 joined by two side walls 3, 4. Two further walls 6, 7 close the cells at each end to form a chamber. A dividing wall 5 is located transversely to the incident and exit walls 1, 2. The dividing wall 5 divides the chamber defined by incident, exit, side and further walls 1, 2, 3, 4, 6, 7 into two compartments which are isolated from one another. The incident and exit walls 1, 2 may be formed from a single piece of cell material and one of the compartments may be filled with a reference material. The cell may be dimensioned for use in a standard cell holder.
Description
OpticalCeU the invention relates to an optical ccli for use in a photometer such as a spectrophotometer or a tluonrneter.
Optical cells are used to hold samples for analysis in spectrophotometers and fluorimeters, To facilitate measurements and simplify the problems of alignment and calibration of the respective cells, cells arc manufactured to have certain standardised dimensions so that they may be received in a standard cell holder. The use of a standard cell holder greatly simplifies the use of the photometer.
In particular iii IJV spectroscopy, very, very small differences in thickness, wedge, or raw material make a big difference to the transmission characteristics the cell. This in mm will have an effect on the uncertainty in any particular measurement, and the effect is especially significant at the limits of the spectral range.
Measurement uncertainty is documented in an uncertainty budget, whien is defined as a statement of measurement uncertainty, of the components of that measurement uncertainty, and of their calculation and combination. The uncertainty budget should include the measurement model, estimates and measurement uncertainties associated with the quantities in the measurement model, covariances, type of applied probability density functions, degrees of freedom, type of evaluation of. measurement uncertainty and any coverage factor.
With the known cells in the far UV range, in particular at wavelengths below 200mm which arc typically made of quartz, the magnitude of' the errors increase significantly and minor impurities in the quartz affect the results as th.e transmission properties of.
the material are a material influence on the results. The uncertainty in a measurement typically increases by a factor of two at these wavelengths and this increase in uncertainty takes the measurement outside of an acceptable uncertainty budget. In th.e metrology the current standards in uncertainty are governed by 131PM document JCGM 100:2008.
The invention therefore seeks to provide a cell ibr use in a photometer \vith improved usability, in particular at the limits of the spectral range, especially in the far IJV spectrum.
According to the invention there is provided a cell adapted to be used. in a cell holder in a photometer comprising an incident wall and an exit wall, which incident and exit walls are joined by side walls and respective end wails to form a chamber, wherein the chamber is divided by a further wall located intermediate to the end walls, which further wal] divides the chaniber into two compartments.
Preferably, at least one end wail is provided with an opening to enable a compartment to he filled. Preferably, at least one compartment is filled with a reference material.
Preferably, the distance between the outer faces of the incident and exit walls is 12.5mm By making the cell of two compartments out of one piece the cell will advantageously virtually eliminate ally variations in transmission characteristics fbr the cell, which enhances the accuracy of the calibration of the cell, As the presence of impurities in the cell material has a siiificant effect on results, the use of the ccli of the invention eliminates the error that would otherwise arise by use of a reference material in a cell made of a different batch of quartz or cell material. Ft therefore eliminates a variable that in known cells wot:Cd take the measurements outside an acceptable uncertainty budget.
An exempkry embodiment of the invention will now he descnbed in greater detail with reference to the drawing in which: Fig. I shows a side view of the cell of the invention Figure 1 shows a side view of the cell. The cell comprises incident I and exit 2 wails, each of which is formed of a single piece of the cell material, which may be quartz or glass by way of exampie. The cell is formed by side walls 3,4. A dividing wall 5 is located transversely to the incident and exit walls so as to divide die interior of the ccli into two compartments, which compartments are thus isolated from one another.
I
A respective further wall 6, 7 located transversely to the incident and exit walls 1,2 and intermediate to the dividing wall 5 and the end of the cell, fbrms the final closing valI of the respective compartment. The further walls 6,7 are each piovided with a small opening, which opening is connected to a respective extension tube 8,9. The extension Lube is typically flame sealed to the further wall 6,7.
The extension tube can be sealed with a ca.p if it is desired to have the compartment re-fillable or alternatively, the tube can he sealed pennanently if the compartment is to he Ii Lied with a reference material to ensure the characteristics of the reference material. Each end of the cell is closed by a respective cap.
One primary application for the cell of the invention is for sealed solutions and another advantage of having two solutions in one unit is fbi instance where there is a blank and one sample solution they cannot get the blanks mixed up with blanks from other sets which currently happens where customers have muhiple sets. Alternatively the cell can he provided with a screw cap at either or both ends so that a user can introduce their own solutions. The cell would he suitable for use in applications from the far UV through to near infra red, typically from 1 9Onm to 2300nin. The cell of the invention permits measurements to he made within an acceptable uncertainty budget with wavelengths below 200nrn The uncertainty of any given measurement process is constructed by consideration of all the contributing errors to produce the uncertainty budget, which is effectively a -f I-tolerance of a mean value. Tins budget is then multiplied by a coverage factor k (usually k =2) which, (if you assume a normal statistical distribution of values) equates to approximately 95 % confidence that the values when measured will fail within the quoted tolerance. This is called the expanded uncertainty budget, and it is this value (together with the confidence interval) that is typically quoted against any measurement value.
If it desired to use the cell in a standard cell holder, the external dimensiorilwidth of the cell will be 12.5mm and the length of the cell is 645mm. The walls will typically he i.5mm thick.
aw mine I imitaLions on the instruments with whih it em. b used 1jeCUie. al thebeam hoight ofthi instrUthents. l'he etill of thc itwenion cmi not oni be used fb bsnrpthm sumdu1s iu noma1 t. V.tit'Ctt'OS(pV hut thc p bihts use t\ttfldb 10 ute for fmu.Oredrit tndard hThoiS Itt I uorinieter 4ppitCat1tn1S CI&ms
Claims (5)
1. A eUthtited tt, he used ii: a cell lcdder in a photometer comprising tn mutknt vall dad an eu wall w lmh tneident nC L \t \t Jt L jO ned h suk walls atid tcspective cod waits to thrrn a chmnhct wherein The chamber ia divided by a.further wlll located inttthid.iate to the end wafls which ikirther wall. divides the chamber into Iwo eompartni.ei1t$.
2, A cell according to Claim 1, wherein at least one end wall is provided with an opening to enable a compartment to he filled.
3. A cell according to Claim 1 or claim 2, wherein at east one compartment is filled with a reference material.
4. A cell according to any one of Cairns I to 3, wherein the distance between the outer faces of the incident and exit walls is 1:2.5mm
5. A cell substantially as describe herein with reference to and as illustrated in die accompanying drawing.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB201214618A GB2504976A (en) | 2012-08-16 | 2012-08-16 | Optical cell with two compartments |
| PCT/GB2013/000371 WO2014027172A1 (en) | 2012-08-16 | 2013-08-16 | Optical cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB201214618A GB2504976A (en) | 2012-08-16 | 2012-08-16 | Optical cell with two compartments |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201214618D0 GB201214618D0 (en) | 2012-10-03 |
| GB2504976A true GB2504976A (en) | 2014-02-19 |
Family
ID=47016877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB201214618A Withdrawn GB2504976A (en) | 2012-08-16 | 2012-08-16 | Optical cell with two compartments |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2504976A (en) |
| WO (1) | WO2014027172A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1267589A (en) * | 1968-11-21 | 1972-03-22 | Zeiss Jena Veb Carl | Sample cell |
| DD242687A1 (en) * | 1985-11-18 | 1987-02-04 | Wolfen Filmfab Veb | OPTICAL MEASUREMENT CUVET |
| DE19735599A1 (en) * | 1997-08-15 | 1999-03-04 | Peter Prof Dr Hering | Nondispersive infrared spectrometer |
| CN101825564A (en) * | 2010-04-23 | 2010-09-08 | 浙江大学 | Optical detection method for continuously monitoring liquid concentration for a long time |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007126389A1 (en) * | 2006-05-02 | 2007-11-08 | Asensor Pte Ltd | Optical detector system for sample analysis having at least two different optical pathlengths |
| US7936463B2 (en) * | 2007-02-05 | 2011-05-03 | Palo Alto Research Center Incorporated | Containing analyte in optical cavity structures |
-
2012
- 2012-08-16 GB GB201214618A patent/GB2504976A/en not_active Withdrawn
-
2013
- 2013-08-16 WO PCT/GB2013/000371 patent/WO2014027172A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1267589A (en) * | 1968-11-21 | 1972-03-22 | Zeiss Jena Veb Carl | Sample cell |
| DD242687A1 (en) * | 1985-11-18 | 1987-02-04 | Wolfen Filmfab Veb | OPTICAL MEASUREMENT CUVET |
| DE19735599A1 (en) * | 1997-08-15 | 1999-03-04 | Peter Prof Dr Hering | Nondispersive infrared spectrometer |
| CN101825564A (en) * | 2010-04-23 | 2010-09-08 | 浙江大学 | Optical detection method for continuously monitoring liquid concentration for a long time |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201214618D0 (en) | 2012-10-03 |
| WO2014027172A1 (en) | 2014-02-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |