JPH054620B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to optical measuring devices such as radiation thermometers and imaging devices that measure the temperature and temperature pattern of a measured object.

[Prior Art] Optical measurement devices such as radiation thermometers are difficult to measure when the measurement location is poor and water vapor, smoke, dust, etc. are present in the optical path between the measured object and the engineering measurement device. It is scattered and absorbed and becomes a disturbance element, making correct measurement difficult.

For this reason, conventionally, as shown in FIG.
was ejected in the forward direction, blowing away dust.

[Problems to be Solved by the Invention] However, if the air A is simply ejected, the air is not rectified, so air A' is likely to be dragged into the window 2 of the optical measuring device 2.
The glass in A was dirty, blocking the optical path and making accurate measurements difficult. Also, air purge pipe 1
Therefore, the viewing angle of the incident light inevitably becomes small, making it difficult to measure a wide area of the object to be measured.

In view of the above points, it is an object of the present invention to provide an optical measuring device that prevents air from being entrained and also allows a wide viewing angle.

[Means for Solving the Problems] The present invention provides a conical part having a first air transmitting part and a window glass at the top at one end of the outer cylinder having an optical detector therein, and a conical part having a first air transmitting part and a window glass at the top. This is an optical measurement device in which air is introduced into the interior through a second air transmission section and is ejected forward through the first air transmission section and the conical section.

[Embodiment] FIG. 1 is an explanatory diagram of a cross-sectional configuration showing an embodiment of an optical measuring device of the present invention.

In the figure, a conical part 5 is provided inside one end side of an outer cylinder 4 which has an optical detector 3 such as a radiation thermometer and a CCD camera inside, and a porous metal, sintered metal, etc. A cylindrical first air permeable part 6 is provided, and a window glass 7 is provided in this first air permeable part 6. A partition plate 8 that closes the opening is provided at the other end of the outer cylinder 4.
An air introduction pipe 10 is provided through a second air permeable portion 9 made of a cap-shaped sintered metal or the like. Further, the optical detector 3 is sandwiched between an upper cooling part 11 and a lower cooling part 12, and is connected vertically by a connecting pipe 13, and conduits 14 and 15 are connected from the outside.
It is held on the outer cylinder 4 or the like by suitable supporting members 16 and 17.

In other words, the optical detector 3 allows a cooling medium such as water to flow through the conduit 15, the lower cooling part 12, the connecting pipe 13, the upper cooling part 11, and the conduit 14, and the optical detector 3 receives water from the outside. Prevent it from being heated by heat.
Then, from the air introduction pipe 10, the second air permeable part 9
Large dust and the like are removed and rectified air (air) A is introduced into the outer cylinder 4, passes between the upper cooling part 11, the lower cooling part 12 and the outer cylinder 4, Prevents dew condensation in the cooling parts 11 and 12, and
The air is rectified by the first air permeable part 6 from the air chamber S around the air permeable part 6, and is ejected forward from within the conical part 5 as uniform air A. Furthermore, the cross-sectional area of the inner top of the conical portion 5 is small, and the cross-sectional area increases toward the outside, so that the pressure is higher on the inside, and it is possible to prevent dust and the like from being entrained.

[Effects of the Invention] As described above, according to the present invention, air is introduced into the outer cylinder having an optical detector inside through the air transmission section, and air is again blown out from the air transmission section and the conical section. Therefore, the air is rectified and ejected at the air permeation part, which prevents dust, etc. from being drawn in. Also, since the pressure inside is higher due to the conical part, it has the effect of preventing entrainment, and furthermore, it is possible to prevent dust from being drawn in. The radiant energy can be incident from a wide angle due to the conical portion, making it suitable for measuring surface patterns with a wide field of view. Furthermore, by providing a cooling device, use at high temperatures is also possible.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a conventional example. 3... Optical detector, 4... Outer cylinder, 5... Conical part, 6, 9... Air transmission part, 7... Window glass, 8
...Partition plate, 10...Air introduction pipe, 11, 12...
Cooling section, 13... connecting pipe, 14, 15... conduit,
16, 17...Supporting member.

Claims (1)

[Claims] 1. An outer cylinder having an optical detector inside; a conical part provided at one end of the outer cylinder and having an opening on the outside;
a first air transmission part provided at the top of the conical part and having a window glass; and a partition plate provided at the other end of the outer cylinder and introducing air into the interior through the second air transmission part, An optical measurement device characterized in that air introduced through the second air transmission section passes through the outer cylinder and is ejected forward from the conical section through the first air transmission section. 2. The optical measurement device according to claim 1, wherein the air transmission section is made of sintered metal or the like. 3. The optical measuring device according to claim 1 or 2, wherein the optical detector is held between cooling parts and air passes around the optical detector.