PROBE FOR GAS ANALYSIS

• US 20120033219A1
• Filed: 08/04/2011
• Published: 02/09/2012
• Est. Priority Date: 08/04/2010
• Status: Active Grant

• Current Assignee: Horiba Limited
• Original Assignee: Horiba Limited
• Inventors: Hokamura, Shigeyuki, Ohnishi, Toshikazu, Ido, Takuya
• Granted Patent: US 8,649,013 B2
• Time in Patent Office: Days
• US Class Current: 356/438
• CPC Class Codes: G01N 1/2202 involving separation of sample components during sampling
• CPC Class Codes: G01N 1/2208 with impactors
• CPC Class Codes: G01N 1/2247 Sampling from a flowing stream of gas
• CPC Class Codes: G01N 1/26 with provision for intake from several spaces
• CPC Class Codes: G01N 2021/151 Gas blown
• CPC Class Codes: G01N 21/15 Preventing contamination of the components of the optical system or obstruction of the light path
• CPC Class Codes: G01N 21/3504 for analysing gases, e.g. multi-gas analysis
• CPC Class Codes: G01N 21/8507 Probe photometers, i.e. with optical measuring part dipped into fluid sample

Abstract

A probe for gas analysis is provided in a pipe through which sample gas flows. The probe includes a tubular member and one or more sample gas inflow portions. The tubular member is disposed to cross a flow of the sample gas, and includes a measurement field to which the sample gas is introduced. The one or more sample gas inflow portions are provided in the tubular member. The sample gas flows around, and flows into the measurement field through the one or more sample gas inflow portions.

Claims

1. A gas analysis probe for analyzing a sample gas flowing through a pipe, comprising:

a tubular member having a measurement field and at least one sample gas inflow portion positioned so that sample gas flowing through the pipe flows around the tubular member through the at least one sample gas inflow portion to the measurement field.

2. The gas analysis probe according to claim 1, wherein the at least one sample gas inflow portion comprises at least one aperture formed only on a downstream side of the tubular member with respect to a direction of flow of the sample gas.

3. The gas analysis probe according to claim 2, wherein the at least one aperture is formed along an entire length of the tubular member.

4. The gas analysis probe according to claim 2, wherein

the tubular member has elongate or linear shape with a symmetry axis along its extension defining a longitudinal direction, and

the at least one aperture is arranged in the longitudinal direction of the extension of the tubular member.

5. The gas analysis probe according to claim 1, wherein

the tubular member has elongate or linear shape with a symmetry axis along its extension defining a longitudinal direction, and

an opening angle of the at least one aperture seen from a most downstream point in relation to the symmetry axis of the tubular member is less than about 90 degrees when the tubular member is seen in the longitudinal direction of its extension and divided along a circumferential direction.

6. The gas analysis probe according to claim 1, further comprising at least one purge air supplying unit configured to supply purge air into the tubular member.

7. The gas analysis probe according to claim 6, further comprising at least one second sample gas inflow portion provided in the tubular member, through which the sample gas flows into the tubular member to prevent the purge air from moving toward a center of the measurement field.

8. The gas analysis probe according to claim 7, wherein the second sample gas inflow portion is a hole formed on an upstream side of the tubular member with respect to direction of flow of the sample gas.

9. The gas analysis probe according to claim 1, wherein the tubular member includes an upstream side where a plurality of small holes are formed, each of the plurality of small holes having a diameter such that dust flowing into the tubular member along with the sample gas does substantially not affect measurement of the sample gas.

10. The gas analysis probe according to claim 2, further comprising a cover configured to open and close the at least one aperture.

11. The gas analysis probe according to claim 10, wherein the cover is a tube-like member disposed within the tubular member and formed with at least one second aperture corresponding to the at least one aperture, in particular with respect to its position, form and/or extension.

12. An optical analyzer comprising:

a measuring device including a light source configured to emit measuring light, a light detecting unit configured to detect light, and a control device configured to control the light source and the light detecting unit; and

an analysis unit including a probe having a tubular member including a measurement field and at least one sample gas inflow portion positioned so that sample gas flows around the tubular member through the at least one sample gas inflow portion to the measurement field, and a light guiding tube configured to guide the measuring light from the light source to the probe for gas analysis.

13. A gas analysis probe configured to be provided in a pipe through which sample gas flows, comprising:

a tubular member disposed to cross a flow of the sample gas, the tubular member including a measurement field to which the sample gas is introduced, a wall on an upstream side with respect to a direction of flow of the sample gas arranged to block an inflow of the sample gas, and

a sample gas inflow portion on a downstream side of the tubular member with respect to the direction of flow of the sample gas, the tubular member having elongate or linear shape with a symmetry axis along its extension defining a longitudinal direction, wherein the sample gas inflow portion includes a plurality of apertures formed along an entire length of the tubular member through which the sample gas flowing around the tubular member changes direction and flows into the measurement field.

14. The gas analysis probe according to claim 13, wherein the wall is formed with a hole through which the sample gas flows into the tubular member to prevent purge air from moving toward a center of the measurement field.

15. The probe for gas analysis according to claim 13, wherein the wall is formed with a plurality of small holes each having a diameter such that dust flowing into the tubular member along with the sample gas does substantially not affect measurement of the sample gas.