JPS61209338A - Optical measuring apparatus - Google Patents

Abstract

PURPOSE:To attain to enhance measuring accuracy by preventing the generation of dew condensation in a detection part, by providing an air purge pipe for injecting hot air and performing the purging of air by injecting hot air to the direction of an object to be measured. CONSTITUTION:The light of a light source 2 is guided through an optical fiber 3 to be projected to an object 1 to be measured and an air purge pipe 6 having an opening 6a is provided around the outer periphery of a detection part 4 collecting reflected light from said object 1 so as to be directed to the object 1 to be measured. Hot air (warm air) A heated to a degree generating no dew condensation and cooling is injected toward the object 1 to be measured from the opening 6a to perform the purging of air. Subsequently, the detection part 4 again sends condensed reflected light to a measuring part 5 through the optical fiber 3 to measure the properties of the object 1 to be measured. Because hot air is used in the purging of air, the generation of dew condensation caused by the cooling of the optical system of the detection part 4 is prevented. By this method, highly accurate and highly reliable measurement is enabled and the damage of the object to be measured is prevented.

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.

[The problems that this invention attempts to solve, however,
The measurement atmosphere may be in poor condition, and sufficient radiant energy may not come from the object to be measured due to dust or the like, 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, there are problems in that the object to be measured is cooled, making it impossible to perform accurate measurements, and dew condensation also occurs in 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.

C 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 and re-entered. The optical fiber 3 is led to a measurement section 5 to measure moisture 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 introduction position of the air purge tube 6 is not only the illustrated position where the detection unit 6 is heated, but also a position closer to the measurement target 1 than the incident 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 the release energy from the wall surface of the heating furnace 7, is connected to the furnace wall 7a.
It is placed closer to the direction of the object to be measured. A detector 4 is provided at the other end of the air purge tube 6 via a light receiving window 8.
Radiant energy from the object to be measured 1 is detected, and the detection signal is led to the measuring section 5 to measure its temperature and the like. Then, air A in the atmosphere inside the heating furnace 7
is a purifying means 9 such as a filter provided on the furnace wall 7a.
The air is purified by air blower 10 and ejected from air purge tube 6 in one direction toward the object to be measured, and used as an air purge.

In this way, hot air is circulated in an atmosphere that is not very different from the object to be measured 1, so there is no need for a heating means to create hot air, and there is no risk of cooling or condensation, resulting in high precision and high reliability. measurement becomes possible. In addition, the purification means 9
It is not necessarily necessary to provide it on the furnace wall 7a, but it is sufficient to purify it to the necessary extent by an appropriate means at an appropriate position.

[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 drawings]

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 pipe, 7.Heating furnace, 8.Light receiving window, 9.Purification means, 10.Blower

Claims (1)

[Claims] 1. An optical system comprising: a detection section that receives radiant energy from an object to be measured; and an air purge pipe that is provided in the direction of the object to be measured from the detection section and blows out hot air. measuring device. 2. The optical measuring device according to claim 1, wherein the air in the measurement atmosphere is purified by a purifying means and used for air purging.