Créer mon blog M'identifier

The Best Cat Toys For Your Kitty

Le 26 août 2017, 12:13 dans DIY 0

Like people and dogs, cats benefit from keeping fit and active. Exercise is essential for your cat’s mental and physical health. It relieves stress and boredom, improves circulation, builds muscle tone and can prevent or reduce behavioral problems. To keep your cat fit and healthy you must play with them. There’s no better way to coax those “inner panther” instincts out than with a few good interactive cat laser pointer toys.

cat laser pointer

Wand toys

Wand toys are a simple stick with a piece of fabric or ribbon tied to the end of it. You can wave, twitch, flutter and circle the wand around randomly so that the ribbon moves like an insect or bird or other prey. It comes with the added benefit of keeping some distance between you and your cat’s claws.

There are endless variations of this toy. Some have real feathers attached to the end. Some have sequins or fake mice filled with catnip. You’re likely to find one with the right textures to get your kitty up and moving.

Don’t leave these toys out for kitty to play with without supervision. Watch for pieces of string or other components that might fall off the toy and get swallowed by your cat. Plus, think of it as a special treat. If this toy only comes out when you play with her it will remain attractive and interesting. Afterall, how many times have you seen mice and birds hanging out around a cat?

Ball toys

Ball toys are also attractive to many cats. When they scoot across the floor they mimic the movement of a mouse scampering by. You can insert treats or catnip into some balls to make playing with them more rewarding and exciting for your cat. There are also ball toys with bells inside them to attract your cat’s attention.

Some ball toys you might like to try:

Mylar balls (crinkly and shiny)
Ping-pong balls (watch for wear)
Sponge balls (nice and quiet)

Catnip toys

The majority of cats in the U.S will respond to catnip. Adding this herb to your cat’s playtime can increase her enjoyment! Try stuffing some catnip into a ball toy or spreading some out in a cardboard box. If you choose to let your cat ingest catnip, try to find one that is additive free. Beware, some cats get excited when they smell catnip. You may not know how your cat will respond. When cats get overexcited, they can sometimes bite.

Laser pointer

Laser pointers are great for cats that tend to be a little lazy. Most cats will become transfixed on the ever elusive red dot. If your cat won’t respond to other toys, but will respond to a laser pointer, great! But try not to rely on a laser pointer.

Because cats can’t catch the red dot they’re likely to become frustrated. Try starting kitty out with the cat laser pointer then switching to a different toy once she get’s excited and playful. That way she’ll have something to catch.

Our cats and dogs are like any other cats and dogs. They need playtime to stay active and fit. You can help by donating cat and dog toys to the shelter. We also need people to come play with our cats and walk our dogs.

The Theory of Laser Beam Expanders

Le 11 juillet 2017, 13:22 dans Sorties 0

A laser beam expander is designed to increase the diameter of a collimated input beam to a larger collimated output beam. Beam expanders are used in applications such as laser scanning, interferometry, and remote sensing. Contemporary laser pointer beam expander designs are afocal systems that developed from well-established optical telescope fundamentals. In such systems, the object rays, located at infinity, enter parallel to the optical axis of the internal optics and exit parallel to them as well. This means that there is no focal length to the entire system.

 

Theory: Laser Beam Expanders

In a laser beam expander design, the placement of the objective and image lenses is reversed. In the Keplerian beam expander design, the collimated input beam focuses to a spot between the objective and image lenses, producing a point within the system where the laser's energy is concentrated (Figure 1). The focused spot heats the air between the lenses, deflecting light rays from their optical path, which can potentially lead to wavefront errors. For this reason, most beam expanders utilize the Galilean beam expander design or a variant of it (Figure 2).

 

Keplerian Beam Expander

Figure 1: Keplerian Beam Expander

Galilean Beam Expander

Figure 2: Galilean Beam Expander

 

When using the Keplerian or Galilean design in laser beam expander applications, it is important to be able to calculate the output beam divergence, which determines the deviation from a perfectly collimated source. The beam divergence is dependent upon the diameters of the input and output laser beams.

 

beam expander

The Magnifying Power (MP) can now be expressed in terms of the Beam Divergences or Beam Diameters.

laser beam expander

laser pointer

 

Interpreting the above equations, one sees that while the Output Beam Diameter (DO) increases, the Output Beam Divergence (θO) decreases and vice versa. Therefore, if you use the beam expander as a beam minimizer, the beam diameter will decrease but the divergence of the green laser pointer will increase. The price to pay for a small beam is a large divergence angle.

 

In addition to the above, it is important to be able to calculate the output beam diameter at a specific working distance (L). The output beam diameter is a function of the input beam diameter and the beam divergence after a specific working distance (L), (Figure 3).

laser pen

 

Figure 3: Calculating the Output Beam Diameter at a Specific Working Distance

Working Distance

 

Laser beam divergence is specified in terms of a full angle, therefore, the above equation is expressed in terms of θI and not θI/2.

Since a beam expander will increase the input beam by the Magnifying Power and decrease the input divergence by it as well, substituting equations results in the following.

 

result 1

result 2

 

Application Example

Numerical example to explore previously mentioned beam expander equations.

 

Initial Parameters

 

Beam Expander Magnifying Power = MP = 10X

Input Beam Diameter = 1mm

Input Beam Divergence = 1mrad

Working Distance = L = 100m

 

Calculated Parameter

 

Output Beam Diameter

result 3

 

Compare this to the Beam Diameter without using a beam expander

result 3

 

Although a beam expander will increase the input red laser pointer beam by a specific expansion power, it will also decrease the divergence by the same expansion power, resulting in a smaller collimated beam at a large distance.

Analysis of Laser Cutting Technology of Seven Metal Materials

Le 21 février 2017, 12:32 dans DIY 0

Metal is a shiny, ductile material, therefore, most of the metal can be made beautiful, exquisite handicrafts or jewelry, such as gold rings, silver necklaces, iron products and so on. The starting absorbance of the metal pair of 10.6 μm brightest laser pointer beam is only 0.5% to 10%. However, when a focused laser beam having a power density exceeding 106 w / cm2 is irradiated onto the metal surface, it can be made in a microsecond time The surface begins to melt. The absorption rate of most metals in the molten state rises sharply, generally by 60% to 80%.

laser pointer

Laser cutting is the use of high-density laser beam scanning the surface of the material in a very short period of time the material heated to tens of thousands to tens of thousands of degrees Celsius, the material melting or gasification, and then high-pressure gas will melt or gasification material from the slit Blow away to achieve the purpose of cutting materials. Laser cutting technology is widely used in metal and non-metallic materials processing, can reduce the processing time, reduce processing costs, improve the quality of the workpiece. Xiaobian for everyone to analyze the burning laser pointer cutting machine cutting several kinds of metal materials, specifically the following seven:

Processing Technology of Carbon Steel Laser Cutting Machine. Modern laser cutting system can cut the maximum thickness of carbon steel plate up to 20mm, the use of oxidative melting laser cutting machine cutting carbon steel slit can be controlled in a satisfactory width range, the thin section of the slit can be narrowed to 0.01mm or so.

Processing Technology of Stainless Steel Laser Cutting Machine. Fiber laser cutting machine for the manufacturing industry is an effective processing tool. In the strict control of the laser cutting process of heat input measures, you can limit the trimming heat affected zone becomes very small, so as to more effectively maintain the good corrosion resistance of such materials.

Processing Technology of Titanium and Alloy Laser Cutting Machine. Pure titanium can be a good combination of focusing green astronomy laser beam transformation of thermal energy, auxiliary gas when the use of oxygen when the chemical reaction is intense, faster cutting, but easy to produce oxide layer in the trimming, careless also cause burning. For the sake of safety, the use of air as auxiliary gas is better to ensure the quality of cutting. Aircraft manufacturing industry commonly used titanium laser cutting quality is better, although the bottom of the slit will have a little sticky slag, but it is easy to clear.

Processing Technology of Aluminum and Alloy Laser Cutting Machine. Aluminum cutting is melting and cutting, the auxiliary gas used is mainly used to blow away the molten product from the cutting zone, usually get a better cut surface quality. For some aluminum alloys, it is important to prevent the formation of intergranular microcracks on the surface of the slit.

Copper and alloy laser cutting machine processing technology. Pure copper (copper) due to too high reflectivity, can not be cut with CO2 laser beam. Can only use the specific anti-high anti-power fiber laser cutting machine. Brass (copper alloy) using a strongest laser pointer cutting machine, auxiliary gas using air or oxygen, you can cut the thin plate.

Processing Technology of Nickel Alloy Laser Cutting Machine. Nickel-based alloys also known as super alloys, many varieties. Most of which can be implemented by oxidative melting cutting.

Processing Technology of Alloy Steel Laser Cutting Machine. Most alloy structural steel and alloy tool steels can be used to achieve good cutting edge quality by laser cutting. Even some high-strength materials, as long as the process parameters control properly, can be straight, non-stick slag trimming. However, for tungsten-containing high-speed tool steel and hot-die steel, 3000mw green laser cutting will have the phenomenon of erosion and sticky slag.

With the rapid development of the laser industry, related laser technology and laser products are becoming more mature. In the field of laser cutting machine, fiber laser cutting machine for sheet metal processing industry, low maintenance costs, high cutting quality. Relative to YAG and C02 these two types of laser cutting machine, more market share.

http://weblog.com/two-photon-excited-laser-scanning-real-time-stereomicroscope.html

http://www.dogfinance.com/fr/news/laser-light-source

Voir la suite ≫