Near back scattering type vehicle-mounted particulate matter sensor and exhaust pipe

A particle sensor and backscattering technology, which can be used in exhaust devices, particle suspension analysis, scientific instruments, etc., can solve the problems of difficult removal of mirror pollution, exhaust pollution of reflective mirrors, and reduced laser transmission efficiency, so as to achieve accurate measurement and improve Monotonous responsiveness, fast response effect

Pending Publication Date: 2022-06-24
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

However, in the harsh exhaust gas environment, high temperature will lead to the shrinkage of the optical fiber, which will reduce the transmission efficiency of the laser. In addition, the mirror surface is directly exposed to the exhaust gas environment, which will quickly pollute the mirror surface by exhaust gas, and from the design of this patent From the structural point of view, it is also difficult to remove mirror pollution

Method used

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  • Near back scattering type vehicle-mounted particulate matter sensor and exhaust pipe
  • Near back scattering type vehicle-mounted particulate matter sensor and exhaust pipe
  • Near back scattering type vehicle-mounted particulate matter sensor and exhaust pipe

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Embodiment Construction

[0051] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0052] like figure 1 and 2 As shown, the near-backscattering vehicle-mounted particle sensor includes a collimating lens 1, a tightening nut 2, a laser channel 3, a probe rod body 4, a heat dissipation fin 5, a laser 6, a wire harness 7, a controller 8, a detector 9, Thermal insulation column 10, optical fiber 11, photosensitive channel 12, condenser lens 13 and exhaust pipe 15;

[0053] It should be noted that the probe base 14 is mounted on the exhaust pipe. The optical fiber 11 between the laser channel 3 and the laser 6 is the first optical fiber; the optical fiber 11 between the photosensitive channel 12 and the detector 9 is the second optical fiber.

[0054] The inside of the probe rod body 4 is equipped with the laser 6, the collimating lens 1, the condenser lens 13 and the detector 9; the laser 6 and the detector 9 are located in the ...

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Abstract

A near back scattering type vehicle-mounted particulate matter sensor is installed on an exhaust pipe for use, when the concentration of particulate matter in tail gas is detected, a controller controls a laser 6 to emit laser, the laser is transmitted to a collimating lens through an optical fiber and a laser channel, and the laser penetrating through a collimating path irradiates the tail gas of the exhaust pipe; when particles in tail gas are irradiated by laser, light beams can be scattered and diffuse reflected in all directions, part of scattered light beams are gathered into the optical fiber through the light sensing channel, scattered light signals are received by the detector 9 and converted into electric signals to be transmitted to the controller, and the emission condition of the particles in the diesel engine is monitored in real time. In addition, the device is simple in structure, accurate in measurement, fast in response, convenient to mount and dismount and low in cost.

Description

technical field [0001] The invention relates to a sensor device, in particular to a near-backscattering vehicle-mounted particulate matter sensor for detecting automobile exhaust particulate matter of a diesel engine. Background technique [0002] Diesel engine particulate matter sensor is an important component to detect the particulate matter content in diesel engine exhaust gas. It is installed on the diesel engine exhaust pipe to detect and monitor the particulate matter downstream of DPF (Diesel Particulate Filter) in real time, so as to realize fault diagnosis and regeneration control of DPF. , so that the emissions of diesel engines meet regulatory requirements. [0003] The traditional methods for detecting the concentration of particulate matter in the exhaust gas of diesel engines include differential pressure sensor, membrane weighing method and smoke method. With the increasingly strict requirements of the national emission regulations on the emission of particu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06F01N13/18F01N13/08
CPCG01N15/06F01N13/08F01N13/18G01N2015/0693
Inventor 钱枫胡桂铭石磊祝能王超邓明星王洁许小伟
Owner WUHAN UNIV OF SCI & TECH
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