JPH0337135B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an optical measurement device that measures the properties of a measurement target using light.

[Prior art] Conventionally, radiation thermometers measure the temperature of a target using thermal radiation, or moisture content is measured from the ratio of light at a wavelength that absorbs moisture to light at a wavelength that does not absorb moisture. Optical measuring devices such as moisture meters are known.

[Problems to be Solved by the Invention] However, the measurement atmosphere may be in poor condition, and dust or the like may prevent sufficient radiant energy from coming from the object to be measured, or the measurement window may become dirty. For this reason, there is a method of air purging by jetting clean air in the measurement direction to avoid the influence of dust and the like.

However, due to this air purge, the object to be measured is cooled, making it impossible to perform accurate measurements, and there are also problems in that dew condensation occurs on the optical system of the measuring device.

In view of the above points, an object of the present invention is to provide an optical measuring device that uses hot air as air for air purging and is free from cooling, dew condensation, and the like.

[Means for Solving the Problems] The present invention includes a detection unit that receives radiant energy from an object to be measured, and an air purge pipe that blows out hot air provided in the direction of the detection unit to the object to be measured. This is an optical measuring device.

[Embodiment] FIG. 1 is a configuration explanatory diagram showing an embodiment of the present invention.

In the figure, reference numeral 1 denotes an object to be measured. Light from a light source 2 is directed to the object to be measured 1 via an optical fiber 3 and directed to a detection section 4, and the reflected light is collected by the detection section 4. The optical fiber 3 is guided again to the measuring section 5 to measure the moisture content and other properties of the object 1 to be measured. Then, an air purge pipe 6 having an opening 6a in the direction of the object to be measured 1 on the outer periphery of the detection part 4 is provided, and heated hot air (warm air) A is blown out in the direction of the object to be measured 1 from the air inlet. Air purge is performed.

In this way, since hot air is used for air purging, there is no possibility of cooling the optical system of the detection unit 4 and causing dew condensation, and there is no possibility that water droplets will fall onto the object to be measured 1 and cause deterioration of quality. do not have. Furthermore, since the air is hot, there is no risk of cooling the object 1 to be measured, resulting in measurement errors or quality deterioration. Note that the temperature of the hot air may be any temperature that does not cause dew condensation or cooling based on the ambient temperature and the temperature and condition of the object 1 to be measured.

In addition, the hot air introducing position of the air purge pipe 6 is not only the illustrated position where the detection unit 6 is heated, but also a position closer to the measurement target 1 from the entrance surface of the detection unit 6 and a position where the detection unit 4 is not heated. It may be in any position. Further, the hot air may also serve as hot air for drying the object 1 to be measured.

FIG. 2 is a configuration explanatory diagram showing another embodiment of the present invention.

In this example, the object to be measured 1 is located in the heating furnace 7, and the air purge pipe 6, which also serves as a radiation seal to remove the influence of radiant energy from the wall surface of the heating furnace 7, is directed from the furnace wall 7a toward the object to be measured. It is set up in A detector 4 is provided at the other end of the air purge tube 6 through a light receiving window 8, and a detector 4 is installed at the other end of the air purge tube 6.
Radiant energy from the sensor is detected, and the detection signal is led to a measuring section 5 to measure its temperature. The air A in the atmosphere inside the heating furnace 7 is purified by a purifying means 9 such as a filter provided on the furnace wall 7a, and is ejected from the air purge pipe 6 in the direction of the object to be measured via the blower 10. , used as an air purge.

In this way, since hot air is circulated in an atmosphere that is not very different from the object to be measured 1,
No heating means is required to generate hot air, and highly accurate and reliable measurements are possible without the risk of cooling or condensation. Note that the purifying means 9 is not necessarily the furnace wall 7a.
There is no need to provide the water at any location, and it is sufficient to purify it to the necessary extent by using appropriate means at an appropriate location.

[Effects of the Invention] As described above, this invention uses hot air as the air for air purging, so there is no risk of condensation forming on the detection section, and there is no possibility of cooling the object to be measured. , high precision and high reliability measurements are possible, and the object to be measured is not damaged.

[Brief explanation of the drawing]

FIGS. 1 and 2 are configuration explanatory diagrams showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Object to be measured, 2...Light source, 3...Optical fiber, 4...Detection section, 5...Measurement section, 6...Air purge tube, 7...Heating furnace, 8...Light receiving window, 9...
...Purification means, 10...Blower.

Claims (1)

[Claims] 1. A detection section that receives radiant energy from the object to be measured in a heated atmosphere, a purification means that purifies the air in the measurement atmosphere, and a purification means installed in the direction of the object to be measured from the detection section and blows out hot air from the purification means. An optical measuring device characterized by comprising an air purge tube.