The present invention provides methods and an apparatus for monitoring the optical output power of a laser diode (LD) having an associated photodiode (PD), and a particle sensor apparatus. The photodiode (PD) is operable together with the laser diode (LD), wherein it detects the light (LS) of the laser diode (LD) and converts it into an electrical current, and is thermally coupled to the laser diode (LD). Monitoring of the optical output power P is effected during the operation of the laser diode (LD) and is based on current measurements and/or voltage measurements at the laser diode (LD) and at the photodiode (PD).

A method of manufacturing a reference sample includes discharging a droplet, obtaining a plurality of captured images by capturing the droplet according to a predetermined period with respect to an imaginary plane defined on a falling path of a discharged droplet, analyzing the plurality of captured images, and marking a point corresponding to the falling path of the droplet on a sample substrate based on a result of analyzing the plurality of captured images.

The present application discloses a material handling system and a monitoring system and a monitoring method for particles in a traveling area of overhead hoist transfers, wherein the monitoring system for particles in the overhead hoist transfer traveling area comprises gas sampling modules, a particle counter and a monitoring device. The gas sampling module is configured to obtain the gas to be tested around traveling wheels of each overhead hoist transfer (OHT). The particle counter is configured to test the gas to be tested for the size and number of particles in the gas to be tested. The monitoring device is electrically connected to the particle counter, and is configured to acquire the size and number of the particles tested and alarm when determining that the content of particles does not meet a preset standard.

An apparatus includes a pipe through which a multiphase fluid flows, with a transparent window structure formed in the pipe. A collimated light source emits light through the transparent window structure into the pipe having a wavelength at which a component of a desired phase of the multiphase fluid is absorptive. A photodetector is positioned such that the emitted light passes through the multiphase fluid in the pipe to impinge upon the photodetector. The photodetector has an actual dynamic range for collimated light detection. Processing circuitry is configured to continuously adjust a power of the collimated light source dependent upon an output level of the photodetector so as to cause measurement of the emitted light over an effective dynamic range greater than the actual dynamic range, and determine a property of the multiphase fluid as a function of the power of the collimated light source.

A solution for controlling cellulose processing includes performing optically first measurements of the cellulose during the processing, performing second measurements of the cellulose by directing optical radiation to the cellulose, the radiation including at least one beam that is polarized and at least one separate beam is non-polarized, measuring attenuations and parameters of polarization of the radiation interacted with the cellulose and determining size of particles in the cellulose based on at least one comparison of the parameters of polarization and the attenuations. The processing is controlled based on the first measurements until a given threshold of the first measurements has been reached and thereafter controlling the processing based on the second measurements.

A photonic aerosol particle sensor includes a microfluidic sensor chamber in which is disposed a plurality of photonic waveguide resonators each having a photonic waveguide on an underlying substrate, along a separate waveguide resonator path with a lateral width different than that of other photonic waveguide resonators. All waveguides in the plurality have a common vertical thickness of a common waveguide material having a refractive index that is larger than that of the underlying substrate material. An optical input connection couples light into the waveguide resonators. An aerosol particle input fluidically connected to the microfluidic chamber fluidically conveys aerosol particles to the chamber, and an aerosol particle output fluidically connected to the microfluidic chamber fluidically conveys aerosol particles out of the chamber. At least one optical output connection accepts light out of the plurality of photonic waveguide resonators to provide a signal indicative of at least one aerosol particle characteristic.

A mobile power device capable of detecting gas is disclosed and includes a main body, a gas detection module, a driving and controlling board, a power module and a microprocessor. The main body includes a ventilation opening, a connection port and an accommodation chamber. The ventilation opening is in communication with the accommodation chamber. The gas detection module and the driving and controlling board are disposed within the accommodation chamber. The gas detection module, the power module and the microprocessor are fixed on and electrically connected to the driving and controlling board. The power module is capable of storing an electric energy and outputting the electric energy outwardly. The microprocessor enables the gas detection module to detect and operate. The microprocessor converts the detection information of the gas detection module into a detection data, which is stored and transmitted to the mobile device or an external device.

An optical detector device may receive a spectroscopic measurement from a multispectral sensor. The optical detector device may determine, based on the spectroscopic measurement, a particulate size of a particulate. The optical detector device may determine, based on the spectroscopic measurement, an identification of the particulate. The optical detector device may determine, based on the particulate size and the identification of the particulate, that an alert condition is satisfied. The optical detector device may trigger an alert based on determining that the alert condition is satisfied.

The present invention relates to a dust sensor comprising; a case having an air inlet and an air outlet, an air flow path which is formed inside the case, of which one end is connected to the air inlet, and of which the other end is connected to the air outlet, and which comprises first and second flow paths that have different air flow directions, a wind-blowing fan arranged on the air flow path, a first sensing module which is arranged on the air flow path and which senses dust particles in the air, and a second sensing module, which is arranged on the air flow path, arranged further downstream than the first sensing module, and senses dust particles that are smaller than the dust particles sensed by the first sensing module, and thus, the present invention can accurately measure both large dust particles and small dust particles present in the air.

The systems and methods provided herein relate generally to the improvement of data quality in optical liquid particle counters and control of optical particle counters to achieve longer expected lifetime, for example by avoiding damage caused by electromagnetic radiation and heat. The systems and methods incorporate sensors which characterize the fluid flowing through the flow cell, thereby enhancing accuracy and reducing the number of false positives.