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What type of MEMS mirror does Hamamatsu make?
Hamamatsu makes electromagnetic mirrors, which consist of a magnet and a MEMS mirror chip. The basic operating principle of electromagnetic mirrors is shown in the figure below. When an electrical current flows into the coil on the MEMS mirror, the mirror tilts according to the Lorentz force.
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Figure 1. An electromagnetic mirror’s structure and basic operating principle
What are the advantages of electromagnetic mirrors?
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The advantages of electromagnetic mirrors include the following:
- Low voltage operation (up to 12 V)
- Large torque
- Large tilt angle
What is the relationship between mechanical deflection angle and optical deflection angle?
As shown in the figure below, the mechanical deflection angle and optical deflection angle have the following relationship:
Hamamatsu Photonics has served the automotive industry since 1978, when we introduced our first sun load sensors for HVAC systems. Over the years, we have continued to deliver top quality opto-semiconductors for use in safety systems, automatic climate control systems, data communications, and many other advanced car features. Due to strict environmental regulations, analytical systems have become on-board devices, which continuously analyze gases or liquids in cars or trucks. Also, the use of optical sensors for safety reasons is becoming more important for example to detect moisture or ice, or to detect dangerous gases in the interior of the car. The Japan-based company Hamamatsu Photonics (also known as Hamamatsu) has emerged since the 1950s as a leader in the photomultiplier industry. Hamamatsu, in the tradition of RCA, has published its own handbook, which is available without cost on the company's website. Hamamatsu offers many types of life science cameras incorporating various types of sensors. Each type has unique characteristics which will affect your imaging result. The cameras are designed and constructed to extract the best performance of the sensors by using Hamamatsu advanced technologies including analog design, digital processing. Hamamatsu (浜松市, Hamamatsu-shi) is a city located in western Shizuoka Prefecture, Japan.As of 1 December 2019, the city had an estimated population of 791,707 in 340,591 households, making it the prefecture's largest city, and a population density of 508/km 2 (1,320/sq mi).
Optical deflection angle = 2 x Mechanical deflection angle
Hamamatsu uses the optical deflection angle in our datasheets.
Can you sell MEMS mirrors in chip form?
We do not sell MEMS mirrors in chip form. The MEMS mirror packaging and assembly are very critical factors for obtaining the performance described in the datasheet. Therefore, we cannot sell these components separately.
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What is the relationship between resolution and frame rate?
In raster scanning, there is a trade-off between vertical resolution and frame rate. The horizontal scanning time is determined by the resonant frequency of the fast axis (fixed frequency). When you increase the horizontal resolution, the time to scan a whole frame also increases. Therefore, it results in a slower frame rate. Typical vertical resolution and frame rate values are shown in the table below.
Table 1. Vertical resolution and frame rate values
What is a MEMS mirror?
MEMS stands for micro-electro-mechanical systems, and a MEMS mirror is a small moving mirror etched on a silicon wafer using MEMS technology. By using a MEMS mirror, you can reduce the size of the whole scanner to a few cm cube.
How are resonant and linear mirrors different?
A resonant mirror moves in a continuous sinusoidal motion at the fixed frequency, usually 1 kHz to tens of kHz. You can get a wide mirror angle with a small driving electric current. For example, our S13989-01H resonant mirror is capable of +/-20 deg. optical angles with +/-25 mA driving current.
A linear mirror tilts its angle according to the driving current. You can stop the mirror at the desired angle or operate it in continuous movement. However, in continuous mode the speed is usually limited to tens of Hz.
Why do you need a feedback loop for the resonant axis frequency?
The mirror’s tilt angle is significantly affected by even a slight shift in the resonant frequency. The resonant frequency can shift over time and when the temperature changes. The feedback loop adjusts the mirror driver frequency to match the shifted resonant frequency, so it can minimize the tilt angle instability.
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Meet the engineers
Mario is a MEMS mirror applications engineer. A music enthusiast, his keen interest in audio systems and electric guitar drew him to electrical engineering. Sound analysis of shamisen, a Japanese musical instrument, was the focus of his graduate studies. Mario still enjoys music-related hobbies such as building audio speakers, playing the jazz guitar, and salsa dancing.