Optical path plug of direct-reading dust concentration measuring instrument

Abstract

The invention discloses an optical path plug of a direct-reading dust concentration measuring instrument. The optical path plug is correspondingly arranged on the opposite side of an optical path connector. The optical path plug comprises a plug body which is detachably connected with a detection box of the measuring instrument, and a plug cover which is arranged at the end of the plug body; an optical path channel communicated with a detection area formed by the detection box is formed in the plug body; a light beam emitted from a light beam eduction tube of the optical path connector passesthrough the detection area and enters the optical path channel; the inner diameter of the optical path channel is gradually increased from the inner end part to the outer end part to form a pluralityof sections of split channels, every two adjacent sections of split channels form a step, the plug cover is closed at the outer end part of the optical path channel, and the plug body is connected with the detection box from the inner end part of the optical path channel. According to the invention, refraction and reflection caused by a light beam entering the optical path channel are gradually absorbed through the stepped and gradually-changed inner diameter of the optical path channel, so that the interference of refraction and reflection on a detection light beam is reduced, and the accuracy of a detection result is improved.

Description

technical field [0001] The invention belongs to the field of dust concentration measurement, and in particular relates to an optical path plug head of a direct-reading dust concentration measuring instrument. Background technique [0002] As we all know, dust is more harmful, and pneumoconiosis caused by long-term inhalation of high-concentration dust is the most common occupational disease; toxic elements such as lead, cadmium, arsenic, manganese, etc. contained in dust dissolve in the respiratory tract and are absorbed into the blood circulation to cause poisoning; Light dust such as hair dust and cotton dust, when inhaled into the respiratory tract, easily adheres to the mucous membranes of the nasal cavity, trachea, and bronchi, causing long-term local irritation and continuous infection to cause chronic inflammation. In addition, dust can also cause eye diseases, skin diseases, etc. Dust also has carcinogenic effects, especially lung cancer. At the same time, for indus...

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Problems solved by technology

[0004] However, the existing light beam emitters are all connected to the detection box through the optical path connector, and an optical path plug is correspondingly provided on the opposite side of the detection box to prevent external light from entering and causing beam interference. However, the common plug , due to the reflection or refraction of the optical path, the light emitted from the beam emitter cannot be completely absorbed. In this way, there will be a certain probability of interference, which will affect the accuracy of detection

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