132 results about "Laser safety" patented technology

A non-invasive near infrared spectrophotometric monitoring transducer assembly includes a housing member, which is adhered directly on a patient's skin. The housing member contains a prism coupled to a flexible and lightweight single core optical light guide, which provides a means of transferring narrow spectral bandwidth light from multiple distant laser diodes of different wavelengths by use of a multi-fiber optic light combining assembly. Different wavelengths are needed to monitor the level of blood oxygenation in the patient. The assembly also contains a planar light guide mounted on the prism located in the housing member, which light guide contacts the patient's skin when the housing member is adhered to the patient's skin. The light guide controls the spacing between the prism and the patient's skin, and therefore controls the intensity of the area on the patient's skin which is illuminated by the laser light. The housing member contains a photodiode assembly, which detects the infrared light at a second location on the skin to determine light absorption. The photodiode assembly is preferably shielded from ambient electromagnetic interference (EMI) by an optically transparent EMI attenuating window. This rigid window placed over the photodiode also provides a planar interface between the assembly and the skin, improving optical coupling and stability as well as reducing the capacitive coupling between skin and the photodiode resulting in further EMI attenuation. The housing may be associated with a disposable sterile hydrogel coated adhesive envelope, or pad, which when applied to the patient's skin will adhere the housing to the patient's skin. The transducer assembly will thus be reusable, and skin-contacting part of the device, i.e., the envelope or pad can be discarded after a single use. The assembly also includes a laser safety interlock means, which is operable to turn off the laser light output in the event that the assembly accidentally becomes detached from the patient's skin.

Laser safety systems, devices, and methods for use in laser projectors are described. A laser projector includes any number of laser diodes that each emit laser light, a shared laser diode power source, a photodetector to detect a power/intensity of a portion of the laser light, a beam splitter to direct a first portion of the light towards the photodetector and a second portion of the light towards an output on the projector, and a laser safety circuit responsive to signals from the photodetector. The laser safety circuit selectively electrically couples/uncouples the laser diodes from the power source depending on the power/intensity of the laser light detected by the photodetector. Particular applications of the laser safety systems, devices, and methods in a wearable heads-up display are described.

The invention provides an optical projection module having a security monitoring function. The optical projection module includes a light source for emitting a light beam, a lens system for receivingthe light beam emitted by the light source to project a parallel light beam, a diffraction optical element for receiving and splitting the parallel light beam to project a patterned light beam, a transparent substrate and a control circuit, wherein a transparent conductive film is attached to the surface of the transparent substrate, and the transparent substrate is fixed on the upper portion of the diffraction optical element; the control circuit is electrically connected with the transparent conductive film, and evaluates and judges the integrity of the transparent substrate and controls a light emitting state of the light source through monitoring changes of the transparent conductive film. The optical projection module has higher laser safety performance.

This invention relates to a continuously adjustable nanosecond semiconductor laser driving power source comprising: a square-wave generator, a shaping amplifier circuit, power amplifier circuit and protective circuit. This inventive power source has characters: (1), continuously adjustable of output pulse parameters such as: peak point current 0-20A, pulsewidth 10-200ns, repetition frequency 1HZ-1MHZ continuously adjustable; (2), having self-power-off protection, it can effectively ensure the semiconductor laser safety working.

A method and apparatus are described for detecting the presence of explosives. The invention utilizes Laser Induced Acoustics (LIA), wherein an area of a substrate surface is irradiated, via deep UV pulsed laser, with laser pulses to generate a detectable audible signal. The invention also provides substantial improvements in the eye-safety of otherwise potentially harmful laser beams. Thus, the invention is particularly well-suited to use in public venues where detection of explosives or improved laser safety may be required.

An automatic optical power management system for use with an optical communications system includes a light source residing in a first circuit pack and adapted to emit light at a nominal power level only absent receipt of an indicator signifying a loss of signal resulting from a fiber discontinuity relating to the first optical fiber, wherein the nominal power level is of sufficient magnitude to violate laser safety guidelines in the event of the fiber discontinuity. A redundant detection system includes a first optical detector residing in the first circuit pack, and a second optical detector residing in a second circuit pack that is optically adjacent to the first circuit. A redundant response system communicates an indicator signifying loss of signal from the first and second optical detectors to the light source upon detection of loss of signal by either detector.

The invention discloses a homing guidance transportation robot. The homing guidance transportation robot comprises a control element which is arranged inside a vehicle body, a traveling mechanism which is connected with the control element, a movement mechanism, a magnetic navigation mechanism, a collision avoidance mechanism and an automatic charging mechanism. The traveling mechanism comprises wheels arranged on the bottom of the vehicle body. The movement mechanism comprises a material carrying roller, a lifting mechanism and a horizontal moving mechanism. The magnetic navigation mechanism comprises a magnetic track arranged on the ground and a navigation sensor which is arranged on the bottom of the vehicle body. The collision avoidance mechanism comprises laser safety protection devices arranged below two ends of the vehicle body and contact-type protective device arranged on the periphery below the vehicle body. The automatic charging mechanism comprises a battery set which is arranged in the vehicle body, a charging connection device connected with the battery set and an electric quantity sensor. The control element is controlled by a remote terminal and exchanges information with the remote terminal through a wireless local area network. According to the homing guidance transportation robot, full automation of work is achieved, and safety and reliability are guaranteed.

A flexible laser safety curtain is disclosed that utilizes a plurality of columns flexibly attached to one another along their longitudinal edges in such a manner as to create a curtain of columns. The base of each column contains a cavity within which at least one moveable element, columnar in form, may be located and protrude from the cavity. The moveable element, when pressed against a work surface, is forced into the cavity. A biasing element within the cavity provides an opposite force on the moveable elements to both keep the moveable element in contact with the work surface, and to return the moveable element to its original position when the inward force is removed. The curtain's edge follows the contours of an uneven work surface and thereby the curtain provides a complete barrier to laser radiation.

A laser safety device and method of protecting against harmful levels of radiation. The device includes a housing with first and second apertures. A photodetector generates a first signal corresponding to a level of radiation entering the housing through the first aperture. A control circuit receives the first signal and generates a drive signal based upon the level of the radiation. A reflector array which can include micro-electro-mechanical mirrors receives the drive signal and diverts a first part of the radiation away from an incident path extending from the first aperture to the second aperture. The reflector array allows a second part of the radiation to continue along the incident path at a safe level towards the second aperture. Optionally, the reflector array blocks the incident path so that substantially no radiation passes to the second aperture if unsafe levels are detected.

A laser safety system providing a system for checking the presence, focus and integrity of a laser beam focusing lens is disclosed. The laser safety system checks the focusing lens properties by capturing an image of a target by viewing the target through the focusing lens from along the laser beam path. An initial, known good, image is compared to an image captured immediately before enablement of the laser beam source to determine if the focusing lens is present, focused and is not damaged. The system may also utilize a mask projected onto the target as well as a low-power visible light laser directed along the path of the processing laser to determine the focusing lens properties. The system can also provide target recognition.

Eye-safe, low-power-density, Class 1 or Class 3R laser treatment systems for medical applications are disclosed. Systems having controlled power and stray irradiation can meet laser safety requirements according to IEC 60825-1:2007 or equivalent for eye-safe rating; classification as laser-Class 1 or as laser-Class 3R. Laser system comprises a diode laser source, an optical fiber probe, means for detecting and identifying said optical probe and means to ensure that laser power transmitted from the fiber probe is limited to pre-specified maximum power level per application; laser wavelength; emission characteristics; probe characteristics; limiting values according to applied safety regulations. Device can identify the connected optical fiber probe to exclude using non-conforming optical fiber probes and/or to limit maximum output to optical powers in compliance with laser safety regulations. System preferably operates at a wavelength of 1400 nm or higher. Breakage or leakage from fiber probe is detectable and prevented.

The invention provides a laser safety control method based on a range sensor. The method comprises the following steps: collecting depth image of an object in a first depth range by utilizing a depthcamera comprising a laser light source; detecting the distance of an object in a second depth range by utilizing the rang sensor; and when the distance of the object reaches a risk value, controllingthe laser light source, the lower limit value of the first depth range being smaller than the upper limit value of the second depth range. The invention also provides a laser safety control device based on the range sensor. The laser safety control method and device based on the range sensor can judge whether the depth camera is close enough to the face or is damaged, and control the laser light source according to the judgment result, thereby effectively solving the problem of laser safety of equipment comprising a laser emitter.

Laser safety glasses for use in laser medical and cosmetic procedures on a patient include a pair of safety glasses wherein the safety glasses include a pair of lenses, one or more of the lenses being structured to absorb one or more predetermined wavelengths of laser energy light; a screen is mounted on at least one lens of the pair of lenses, the screen being operatively associated with a system one of internal or external to the glasses configured to generate and provide information regarding the medical or cosmetic procedure to a wearer of the laser safety glasses through the screen.

A laser protection device that can stay tightly on an animal by going over its head and eyes using a flexible material such as nylon. The device has polymer or glass windows that are designed to block or attenuate the treatment light in order to protect the eyes of the animal from laser damage. As an integral feature, the windows are partially transparent in the visible spectrum to allow the animal to see its surroundings.