A trap bowl is provided to accumulate liquid droplets from a filter, as a liquid content. The trap bowl includes a transparent vertical prism. The transparent vertical prism includes a face that forms a vertical transparent surface facing against a content of the section. The face can provide a first angle of total reflection when content of the section is a type of gas, and a second angle of total reflection when the content of the section is the liquid content. A light source may emit a light beam incident on the face at an angle of incidence. The angle of incidence results in reflection of the light beam, striking the light receiver, when the face has the first angle of total reflection, and results in refraction of the light beam, missing the light receiver, when the face has the second angle of total reflection.

Methods and systems for in-fluid testing of electro optic liquid sensors are provided. The electro optic sensor has a light source and a light detector such that a first power state is applied to the light source to generate a first light for determining whether liquid is present within the electro optic sensor. Based on a determination that liquid is present within the electro optic sensor, a second power state is applied to the light source for generating a second light. The second power state having higher power over a shorter period of time than the first power state. The second light generated from the light source is reflected and the reflected second light is received at the light detector. The reflected second light is compared to a pulse current threshold value to determine whether the electro optic sensor is functioning properly.

The present application discloses a manual-automatic integrated self-adaptive pump with an infrared water level detection function, which comprises a pump housing, a water pumping assembly, a base, a vacuum cofferdam, a water outlet pipeline, a volute, an exhaust port, a sensor adjusting mechanism and an infrared liquid level sensing assembly. In this way, the manual-automatic integrated self-adaptive pump with the infrared water level detection function provided by the present application has a compact structure, can be easily installed, has strong adaptability, can realize manual and automatic free switching, can realize more accurate detection of remaining water level, has a longer service life, and can solve the problem of sensing the water level in the field.

The invention declares a FBG (fiber Bragg grating) intelligent device and method for monitoring coal level in bunker. The device comprises a support device located above the bunker and detachably connected with a vibration device. The vibration device, with a surrounding reserved groove on its shell, extends into the bunker, and the groove is used for embedding FBG sensing device which is connected with FBG Network Demodulator. The Demodulator is electrically connected with a data processing system which is electrically connected with an alarm device, and the alarm device is connected with the belt conveyer. The invention relates to wavelength drifts of FGB, which has fast response and high precision, and can transmit signals to the display device first, providing good operating environment for the bunker.

A trap bowl is provided to accumulate liquid droplets from a filter, as a liquid content. The trap bowl includes a transparent vertical prism, The transparent vertical prism includes a face that forms a vertical transparent surface facing against a content of the section, The face can provide a first angle of total reflection when content of the section is a type of gas, and a second angle of total reflection when the content of the section is the liquid content. A light source may emit a light beam incident on the face at an angle of incidence. The angle of incidence results in reflection of the light beam, striking the light receiver, when the face has the first angle of total reflection, and results in refraction of the light beam, missing the light receiver, when the face has the second angle of total reflection.

An apparatus for accumulating a fluid, the apparatus including a drain bottle for containing the fluid, a reservoir having an outlet towards the drain bottle, the reservoir and the drain bottle communicating with each other via a valve provided in the outlet, a suction aperture connectable with a suction pump for creating a vacuum in the reservoir, an optical sensing device operably coupled to the reservoir and adjusted to measure the volume of the fluid standing in the reservoir, the optical sensing device comprising a light source and a detector, wherein the light source is configured to emit light towards the reservoir and the detector is configured to detect an intensity of the light emanating from the reservoir, and at least one light directing means for directing the light on its path from the light source to the detector.

The present application discloses a manual-automatic integrated self-adaptive pump with an infrared water level detection function, which comprises a pump housing, a water pumping assembly, a base, a vacuum cofferdam, a water outlet pipeline, a volute, an exhaust port, a sensor adjusting mechanism and an infrared liquid level sensing assembly. In this way, the manual-automatic integrated self-adaptive pump with the infrared water level detection function provided by the present application has a compact structure, can be easily installed, has strong adaptability, can realize manual and automatic free switching, can realize more accurate detection of remaining water level, has a longer service life, and can solve the problem of sensing the water level in the field.

The invention relates to a method for determining a lower boundary surface and/or an upper boundary surface of a liquid in a container, in which illumination light is emitted that is focused by an objective lens at a focal point, wherein a measurement signal reflected at the focal point is detected by a two-dimensional detection device arranged in an image plane of the objective lens, and wherein the lower boundary surface and/or the upper boundary surface is detected based on the detected measurement signal.

A liquid cartridge includes a first surface, a second surface spaced apart from the first surface, and a third surface extending between the first surface and the second surface, with a liquid outlet through the first surface. A circuit board is mounted on the third surface. A locking mechanism includes a locking surface that extends above the third surface, and a liquid detection mechanism includes a light access portion. The light access portion is disposed between the circuit board and the locking surface, and the circuit board is disposed between the first surface and the light access portion.

A method of operating an electro-optic sensor includes disposing at least a portion of the electro-optic sensor in a liquid chamber, providing light from a light source of the electro-optic sensor at a first intensity, driving a light detector of the electro-optic sensor at a first sensitivity level, receiving, via the light detector, a first amount of light from the light source; determining whether liquid is present in the liquid chamber according to the first amount of light, providing light from the light source at a second intensity, driving the light detector at a second sensitivity level, receiving, via the light detector, a second amount of light from the light source, and/or confirming whether liquid is present in the liquid chamber according to the second amount of light. The first sensitivity level may be different from the second sensitivity level.