The sensing element

 

(57) Abstract:

Usage: a device and apparatus for measuring or dosing of bulk materials. The inventive sensor element contains the source and receiver of the infrared radiation (ISR), mounted coaxially in made from transparent to IKI material cylinder. Between source and receiver set screen with a reflective surface facing the source and located obliquely to the optical axis. Emitted by the source stream IKI gets on the screen and is reflected from it in the direction of the outer surface B of the cylinder. When the bulk material stream IKI reflected from it, gets to the receiver, which generates a signal of the presence of the material. 1 C. p. F.-ly, 2 Il.

The invention relates to measuring technique and is intended for use in devices for level measurement or metering of bulk materials such as cement, flour, sugar, grain, and other materials.

Known sensitive elements containing the source and receiver of the infrared radiation, the optical axes of which are arranged in one plane, and a protective element made of transparent Infrakrasnye solution is sensitive element, which contains mounted on the panel of absorbing infrared radiation material source and an infrared receiver, the optical axes of which are arranged in one plane, and a protective element transparent to infrared radiation material.

A disadvantage of the known sensor element is the following.

The source and receiver of the infrared radiation in this element must be perpendicular to the longitudinal axis of the element. This structural arrangement of the source and receiver increases the dimensions of the sensing element width, as in this case, these dimensions are determined by the longitudinal dimensions of the source and receiver of infrared radiation.

The purpose of the invention is to create a compact sensing element.

Goal is achieved by improving the well-known sensitive element containing the source and receiver of the infrared radiation, the optical axes of which are arranged in one plane, and a protective element made from transparent to infrared radiation material.

The improvement consists in that the sensor element is supplied location is the radiation source and located obliquely to the optical axis.

In addition, the reflective surface of the screen may be a conical surface with the vertex lying on the optical axis of the source of infrared radiation, the source and the infrared receiver are facing each other and are located on the same axis.

The above implementation of the sensing element allows you to position the source and receiver of the infrared radiation parallel to the longitudinal axis of the element, which gives the opportunity to reduce its dimensions in width.

In addition, the execution screen of the conical reflecting surface allows radially distribute the flow of infrared radiation in the direction of the outer surface of the protective element. This allows for increasing the area of the reflective surface to increase the flux of the reflected infrared radiation falling on the receiver, and thus increase the sensitivity of the element.

In Fig. 1 and 2 show embodiments of the sensing element. The arrows show the direction of the rays of infrared radiation.

Sensitive element contains the source 1 and the receiver 2 of infrared radiation, optical axes of which are arranged in one plane, the example of the protective element is designed in the form of a cylinder 3 with aligned openings 4 and 5, in which are installed facing each other, the source 1 and the receiver 2 of infrared radiation. Between the source 1 and the receiver 2 of infrared radiation in the cylinder 3 has a screen 6 with the reflecting surface facing the source 1. The size of the screen 5 are chosen in such a way that it completely prevented the ingress emitted by the source 1 flow of infrared radiation on the receiver 2. In the sensitive element, an embodiment of which is shown in Fig. 1. the screen 6 is a metal plate located at an angle = 25-45aboutto the optical axis of the source 1. In the sensitive element, an embodiment of which is shown in Fig. 2, the screen 6 is a metal cone with the vertex lying on the optical axis of the source 1 and the angle at the vertex = 50-90about.

The sensing element operates as follows.

Emitted by the source 1, the flow of infrared radiation is directed onto the screen 6. In the sensitive element shown in Fig. 1, is incident on the reflective surface And the screen 6, the flow of infrared radiation is totally reflected from it in the direction of the outer surface of the cylinder 3. In the absence of controlled material problade is a small part, reflected from the illuminated area of the outer surface of the cylinder 3, gets to the receiver 2. Thus generated by the receiver 2 output signal is practically zero. When controlled granular material in the working area of the sensing element passed through the cylinder 3, the flow of infrared radiation reflected from the granular material falling on the receiver 2, which generates an output signal.

In the sensitive element shown in Fig. 2, is incident on the conical reflecting surface of the screen 6, the flow of infrared radiation radially reflected from it. When the controlled material flow of infrared radiation reflected from the annular section of the outer surface of the cylinder 3. Thus by increasing the area of the reflective surface increases the total flux of the reflected infrared radiation falling on the receiver 2, which leads to an increase of the output signal from the receiver 2 and, consequently, to increase the sensitivity of the element. (56) USSR Author's certificate N 11631400, CL G 01 F 23/22, 1988.

1. The SENSITIVE ELEMENT containing the source and receiver of the infrared radiation, the optical axes of which are arranged in one plane, and protective the outer surface, placed between the source and the receiver of infrared radiation at an angle to the optical axis of the source of infrared radiation, is 25 - 45owhile reflecting surface facing the radiation source.

2. Item under item 1, characterized in that the reflecting surface is made conical with the apex lying on the optical axis of the source of infrared radiation, and forming a component with an optical axis of the radiation source angle , the source and the infrared receiver are aligned.

 

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