Optical analyzer and wavelength stabilized laser device for analyzer

A laser device and optical analysis technology, which is applied in the direction of material analysis, lasers, and analytical materials through optical means, can solve the problems of narrow laser wavelength band, reduced analysis accuracy, and weakened light intensity, so as to achieve consistent absorption wavelength and flexibility Improve and improve the effect of vulnerability

Active Publication Date: 2011-05-18
HORIBA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the oscillation wavelength of the laser is deviated, the light intensity of the gas absorption wavelength in the laser wavelength component will decrease sharply due to the narrow wavelength band of the laser, which greatly reduces the analysis accuracy.

Method used

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  • Optical analyzer and wavelength stabilized laser device for analyzer
  • Optical analyzer and wavelength stabilized laser device for analyzer
  • Optical analyzer and wavelength stabilized laser device for analyzer

Examples

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no. 1 example

[0082] The analyzer laser device 100 according to the first embodiment is used, for example, in an infrared gas analyzer for measuring the component concentration of an analyte in a sample gas, and has such figure 1 structure shown.

[0083] exist figure 1 In , the symbol 1 represents the Peltier module. This Peltier module 1 has a flat single substrate 11 and a Peltier element 12 mounted on the back surface of the substrate 11 . Here, a sensor and control circuit (not shown) such as a thermostat for operating the Peltier element 12 to keep the surface temperature of the substrate 11 constant is attached.

[0084] Reference numeral 2 denotes a semiconductor laser that outputs infrared laser light for gas analysis. The semiconductor laser 2 outputs analytical laser light in the mid-infrared region (approximately 2.5 μm to 20 μm) from the main injection port, and emits leaked light having the same wavelength as the analytical laser light and having a certain proportional inte...

no. 2 example

[0110] Next, a second embodiment will be described. Also, the symbols added in the second embodiment and the symbols added in the first embodiment are independent of each other and have no correlation.

[0111] The optical analysis device X100 designed in this second embodiment, for example, is used to detect the water vapor (H 2 O) the infrared gas analysis device of concentration, it has such as Figure 7 structure shown.

[0112] in the Figure 7 In , symbol X1 denotes a semiconductor laser that emits infrared rays as measurement light for gas analysis. Here, the emission near-infrared region (about 0.8 μm to about 2.5 μm, due to the determination of H in this embodiment 2 O concentration, eg, 1390nm) coherent light (hereinafter also referred to as laser) laser.

[0113] Symbol X2 denotes a fiber type analysis section exposed to sample gas. The fiber type analysis section X2, such as Figure 8 , Figure 9 As shown, it is composed of a core X2a and a cladding X2b. At...

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Abstract

Provided is an optical analyzer which can promote enhancement of measurement sensitivity, cost reduction, size reduction, structural flexibility, disturbance resistance, and the like, at the same time. An optical analyzer comprises a laser light source (2); a wavelength selection element (3) for selecting and leading out light having a wavelength substantially equal to the absorption wavelength of an analysis object from among light outputted from the laser light source (2); an optical detection means (5) for detecting the intensity of light led out from the wavelength selection element (3); and a drive current control means (6) for increasing or decreasing the drive current of the laser light source (2) near a specified current value thereof for outputting light of the absorption wavelength, and setting the drive current at such a current value as the intensity of light detected by the optical detection means (5) has a peak value. The laser light source (2), the wavelength selection element (3), and the optical detection means (5) are mounted on a single substrate (11) which can regulate the temperature to a constant level.

Description

technical field [0001] The present invention relates to an optical analyzer for measuring the concentration or density of an analyte, such as gas, based on a drop in the intensity of light irradiated to the analyte, and a laser device used for the optical analyzer. Background technique [0002] In laser sources such as semiconductor lasers, etc., a photodiode for monitoring laser intensity is sometimes integrated in the package. According to such a laser source, the drive current is dynamically controlled while monitoring the output signal of the photodiode, so that the laser intensity can be kept stable for a long time regardless of changes in the surrounding environment or over time. [0003] On the one hand, when using the laser output from such a laser source for gas measurement, the stability of the laser intensity is also very important. In addition, the center oscillation wavelength of the laser and the peak absorption wavelength of the gas are required to be stably m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/27G01N21/39H01S5/022
CPCG01N21/3504G01N21/7703H01S5/024G01N21/39H01S5/02415G01N2201/0231H01S5/0687H01S5/06213H01S5/02248G01J3/108H01S5/02325
Inventor 右近寿一郎井户琢也三村享
Owner HORIBA LTD
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