Four-channel pyroelectric infrared sensor with composite package

Abstract

The invention provides a four-channel pyroelectric infrared sensor with composite package. The four-channel pyroelectric infrared sensor comprises a pipe cap, a cantilever structure, a pipe seat packaged at the bottom of the pipe cap, four filtering windows formed on the top of the pipe cap, a circuit substrate arranged outside the pipe seat, four groups of sensitive elements, and four groups of signal processing circuits which are electrically connected with the sensitive elements, wherein the cantilever structure is arranged on the inner side of the pipe seat; the four groups of sensitive elements are arranged on the cantilever structure; pyroelectric gas sensitive elements of the four groups of sensitive elements and the four filtering windows are arranged in a one-to-one correspondence relationship; the four groups of signal processing circuits are arranged on the circuit substrate respectively; a packaging cover is arranged on the circuit substrate; and the four groups of signal processing circuits are positioned in the packaging cover. The invention has the advantages that: due to the composite package structure, the four-channel pyroelectric infrared sensor is scientific in design, simple in manufacturing process, low in production cost and excellent in anti-jamming performance.

Description

technical field [0001] The invention relates to the technical field of gas sensors, in particular to a compound packaged four-channel pyroelectric infrared sensor. Background technique [0002] In daily life or industrial production process, four-channel pyroelectric infrared sensor is widely used in various occasions. At present, the four-channel pyroelectric infrared sensor on the market mainly adopts a unified packaging method, that is, the sensitive element and the signal processing circuit are packaged together. This packaging method has particularly high requirements on the production process and production environment, and the difficulty of the process flow It is also relatively large, resulting in high production costs, and the sensor and the signal processing circuit are packaged together, and the signal interference between them is very large, which greatly affects the accuracy of detection. In terms of signal amplification and processing, the traditional four-cha...

AI Technical Summary

Problems solved by technology

At present, the four-channel pyroelectric infrared sensor on the market mainly adopts a unified packaging method, that is, the sensitive element and the signal processing circuit are packaged together. This packaging method has particularly high requirements on the production process and production environment, and the difficulty of the process flow It is also relatively large, resulting in high production costs, and the sensitive element is packaged with the signal processing circuit, and the signal interference between each other is very large, which greatly affects the accuracy of detection

In terms of signal amplification and processing, the traditional four-channel pyroelectric infrared sensor mainly uses two signal processing methods: current amplification and voltage amplification, the anti-interference performance is relatively weak, and the measurement accuracy is not high.

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